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Industry Finance (44)
- Nonprofit Accounting & Grant Budgeting
- Retail Math & Merchandising
- Solar & Energy Project Finance
- Agriculture & Farm Business Finance
- Manufacturing Metrics: OEE, Capacity & Takt Time
- Oil & Gas Economics: Decline Curves, Netbacks & Well NPV
- Fleet Management: Vehicle TCO, Replacement Cycles & EV vs Diesel
- Telecom Economics: ARPU, Churn, Network Capex & Tower Math
- Warehouse Operations: Pick Rates, Slotting, Space & Labour Planning
- Last-Mile Delivery Economics: Cost per Drop, Routes & Failed Deliveries
- Mining Economics: Grade, Tonnage, Cut-Off & Mine NPV
- Battery Storage Economics: Arbitrage, Degradation & LCOS
- Shipping Economics: Freight Rates, Bunker Costs & Time-Charter Equivalent
- Film & TV Production Finance: Budgets, Recoupment & Box Office Waterfall
- Car Dealership Economics: Gross per Unit, F&I, Service Absorption & Floorplan
- Semiconductor Yield Economics: Dies per Wafer, Yield Models & Cost per Chip
- Apparel Costing: Fabric Consumption, CMT, FOB & Landed Cost
- Aquaculture Economics: Biomass, Feed Conversion & Cost per Kilo
- Forestry Economics: Timber Volume, Growth, Rotation Age & Land Value
- 3D Printing Cost Estimation: Material, Machine Time & Pricing
- Public Transit Economics: Ridership, Farebox Recovery & Service Planning
- Airport Economics: Passenger Flows, Gate Capacity & Non-Aeronautical Revenue
- Dairy Farm Economics: Milk Yield, Feed Cost per Litre & Herd Replacement
- Water Utility Rate Setting: Revenue Requirement, Tiered Tariffs & Affordability
- Music Royalties: Streaming Payouts, Splits, Publishing & Recoupment
- Book Publishing Economics: Royalties, Print Costs, Advances & Self-Publishing
- Car Rental Economics: Utilisation, Rate per Day, Fleet Sizing & Depreciation
- EV Charging Station Economics: Utilisation, Demand Charges, Pricing & Payback
- Childcare Center Economics: Ratios, Enrolment, Tuition & Staffing Costs
- Vertical Farming Economics: Yield per m², LED Energy, Crop Cycles & Cost per kg
- Injection Moulding Cost Estimation: Part Weight, Runners & Regrind, Cavities, Cycle Time, Machine Rates, Tooling & Part Price
- Bike & Scooter Sharing Economics: Trips per Vehicle-Day, Ride Pricing, Charging & Rebalancing, Damage Write-Offs and Unit Economics
- Industrial Automation Math: Analog Signal Scaling, Live-Zero Inputs, Tank Levels, Totalisers, Conveyor Speeds & Alarm Limits with Hysteresis
- Sheet Metal Fabrication Quoting: Flat Blanks & Bend Allowance, Nesting & Material Utilisation, Laser Cut Time, Press Brake Time & Batch Pricing
- Waste & Recycling Economics: Collection Routes, Gate Fees, Sorting Recovery Rates, Material Prices, Residue Costs & Cost per Tonne
- Job Sequencing & Shop Scheduling by Hand: FCFS, SPT, EDD, Critical Ratio, Weighted Rules, Johnson's Rule & Changeover Matrices
- Quoting Signs & Large-Format Print: Areas, Roll Media Yield, Ink & Laminate Use, Board Sheets, Machine & Finishing Time, Installation and Job Margins
- Tolerance Stack-Ups & Geometric Tolerancing by the Numbers: Limits & Fits, Loop Diagrams, Worst Case vs Statistical, Position Tolerances, Bonus Tolerance & Allocation
- PLC Logic by Hand: Contacts & Coils, Seal-In Circuits, the Scan Cycle, Edge Detection, Timers, Counters, Step Sequences & Alarm Handling
- Machine Design by Hand: Stress Transformation & Mohr's Circle, Combined Shaft Loads, Von Mises, Fatigue & the Goodman Line, Shaft Sizing, Bearing Life, Gear Forces, Springs & Bolt Preload
- Electric Motors & Transformers by Hand: Turns Ratios, Equivalent Circuits, Voltage Regulation, Efficiency, DC Motor Speed & Torque, Induction Motor Slip, Power Flow & Motor Energy Costs
- Finite Elements by Hand: Spring and Bar Elements, Stiffness Tables, Assembly, Boundary Conditions, Solving by Elimination, Truss Elements, Mesh Refinement & Result Checks
- Land Surveying by the Numbers: Angles & Bearings, Distance Reductions, Closed Traverses, Misclosure & the Bowditch Adjustment, Coordinates, Levelling Runs & Setting Out
- Pneumatics by the Numbers: Cylinder Forces, Air Consumption, Valve Flow, Demand Profiles, Compressor & Receiver Sizing, Pressure Drop, Condensate and the Cost of Compressed Air
Healthcare Business (21)
- Clinic & Medical Practice Finance
- Hospital Operations Analytics: Beds, Flow & Staffing
- Pharma & Biotech Valuation: Risk-Adjusted NPV, Phase Probabilities & Peak Sales
- Pharmacy Inventory Operations: Par Levels, Expiry & Turnover
- Medical Billing & Revenue Cycle Metrics: Claims, Denials & Days in AR
- Care Home Operations: Occupancy, Staffing Ratios & Cost per Resident Day
- Blood Bank Inventory Management: Blood Types, Shelf Life & Shortage Risk
- Veterinary Practice Economics: Appointments, Average Transaction & Pharmacy Margin
- Dental Practice Economics: Chair Utilisation, Hygiene, Collections & Practice Value
- Dialysis Clinic Operations: Chair Schedules, Staffing Ratios, Supplies & Cost per Treatment
- Outpatient Clinic Scheduling: Slot Templates, Waiting Lists, No-Shows & Patient Flow
- Nurse Staffing Budgets: Census, Workload, Hours per Patient Day & FTEs
- Home Care Agency Economics: Client Hours, Caregiver Scheduling, Travel Time, Pay vs Bill Rates & Overtime
- Clinical Trial Site Budgets: Per-Patient Costs, Visit Schedules, Screen Failures, Invoiceable Items & Payment Holdbacks
- Health Plan Claims Analytics: Cost per Member per Month, Utilisation per 1,000, High-Cost Claimants, Trend & Benefit Design Effects
- Imaging Center Economics: Scanner Capacity, Exam Mix, Revenue per Exam, Technologist Staffing, No-Shows & Scanner Payback
- Clinical Laboratory Operations: Test Volumes, Cost per Test, Batch Runs, Instrument Capacity, Turnaround Times & Send-Out Decisions
- Operating Room Block Scheduling: Block Allocation, Utilisation, Case Duration Estimates, First-Case Starts, Turnover & Overtime
- Optical & Eye-Care Practice Economics: Appointment Capacity, Capture Rate, Frame & Lens Margins, Contact Lens Plans, Frame Stock & Break-Even
- Physiotherapy & Therapy Practice Economics: Session Capacity, Therapist Productivity, Package Plans, Cancellations, Room & Equipment Use and Break-Even
- Community Pharmacy Business Economics: Prescriptions per Day, Dispensing Margins, Front-Shop Sales, Service Fees, Staffing per Hour & Break-Even
Hospitality, Food & Leisure (24)
- Restaurant & Hotel Finance
- Event Planning Budget & Ticket Pricing
- Brewery & Beverage Production Costing
- Ghost Kitchen & Food Delivery Economics: Commissions, Food Cost & Order Profit
- Winery & Vineyard Economics: Yields, Cost per Bottle & Barrel Ageing
- Coffee Shop Economics: Cost per Cup, Throughput, Staffing & Break-even
- Cinema Economics: Box-Office Splits, Concessions & Screen Scheduling
- Ski Resort Economics: Skier Days, Lift Capacity, Snowmaking & Pass Pricing
- Bakery Economics: Baker's Percentages, Batch Costing, Yield & Production Planning
- Distillery Economics: Proof Gallons, Angel's Share, Cask Inventory & Ageing Cash Flow
- Golf Course Economics: Rounds, Tee-Sheet Utilisation, Green Fees & Maintenance
- Food Truck Economics: Locations, Ticket Size, Food Cost, Events & Break-even
- Bar & Beverage Cost Control: Pour Cost, Inventory, Variance & Par Levels
- Catering & Banquet Costing: Per-Guest Pricing, Guarantees, Staffing & Event Profit
- Hotel Revenue Management: Segments, Channel Costs, Comp-Set Indices, Pace & Group Displacement
- Campground & Glamping Site Economics: Pitches and Units, Seasonal Occupancy, Rate Ladders, Amenity Costs & Payback
- Escape Rooms & Leisure Venues by the Numbers: Slots, Reset Times, Group Pricing, Game-Master Staffing, No-Shows & New-Room Payback
- Tour Operator Package Pricing: Per-Person Costing, Minimum Group Sizes, Single Supplements, Currency Buffers, Deposits & Departure P&L
- Hotel Housekeeping Operations: Room Credits, Attendant Staffing, Linen Par Levels, Laundry & Amenity Costs, Inspections and Cost per Occupied Room
- Restaurant Seat & Table Management: RevPASH, Table Turns, Party-Size Mix, Reservations vs Walk-Ins, No-Shows & Floor-Plan Optimisation
- Theme Parks & Attractions by the Numbers: Ride Capacity, Queue Times, Rides per Guest, Fast-Lane Shares, Per-Capita Spend & New-Ride Payback
- Running a Wedding & Event Venue: Date Pricing, Packages, Minimum Spends, Capacity Layouts, Booking Lead Times & Profit per Event
- Marina & Boatyard Economics: Berth Mix by Length, Annual, Seasonal & Visitor Nights, Waiting Lists and Berth Fit, Fuel Dock, Haul-Outs & Winter Storage, Pontoon & Dredging Reserves and Break-Even
- Coffee Roastery Economics: Green Coffee Landed Cost, Roast Loss & Yield, Batch Planning, Blend Costing, Packaging, Channel Pricing, Green Stock Cover and Break-Even
Trades & Local Services (17)
- Construction Cost Estimating & Job Costing
- Car Wash Business Economics: Throughput, Memberships & Cost per Wash
- Plumbing Trade Math: Pipe Offsets, Slope, Flow & Fixture Units
- Machinist Shop Math: Speeds & Feeds, Tolerances, Bolt Circles & Tapers
- Electrician Math: Ohm's Law, Load Calculations, Voltage Drop & Conduit Fill
- HVAC Math: Heat Loads, BTU, CFM, Duct Sizing & Refrigeration Basics
- Carpentry Math: Board Feet, Rafters, Stairs, Framing & Material Takeoffs
- Welding & Fabrication Math: Weld Volume, Filler Metal, Heat Input & Cutting Layouts
- Laundromat Economics: Turns per Day, Utilities per Cycle, Pricing & Payback
- Landscaping Math: Areas, Mulch & Soil Volumes, Pavers, Plant Spacing & Job Quotes
- Auto Mechanic Math: Displacement, Compression Ratio, Gear Ratios, Tyre Sizes & Labour Quotes
- Concrete & Masonry Math: Slabs, Footings, Rebar, Block Walls, Mortar & Pour Quotes
- Time & Materials Billing for Trades: Labour Burden, Charge-Out Rates, Daywork Sheets & Capped Invoices
- Cleaning Business Math: Production Rates, Job Quotes, Recurring Plans, Supplies & Crew Schedules
- Roofing Math: Pitch Multipliers, Roof Squares, Shingle Bundles, Underlayment, Gutters & Quotes
- Running a Painting & Decorating Business: Surface Takeoffs, Production Rates, Coats & Coverage, Crew Days, Job Pricing and Profit per Job
- Drywall & Plastering Math: Wall & Ceiling Takeoffs, Boards and Waste, Studs & Tracks, Screws, Tape & Compound, Plaster Coverage, Crew Days and Quotes
IT & Tech (48)
- Cybersecurity Risk Quantification in Excel
- Cloud Cost Management (FinOps) in Excel
- IT Service & Reliability Metrics
- Software Project Estimation & Agile Metrics
- SQL Concepts with Spreadsheets: Joins, Group By & Filters
- IT Capacity Planning: Throughput, Latency & Scaling
- DevOps Metrics: DORA Four Keys, Flow & Reliability
- Software Testing & QA Metrics: Defects, Coverage & Release Readiness
- Data Center Energy: PUE, Cooling, Power Capacity & Carbon
- IP Subnetting Math: Binary, CIDR, Hosts & VLSM
- Security Operations Metrics: MTTD, MTTR, Vulnerability SLAs & Alert Triage
- Web Performance Metrics: Core Web Vitals, Page Weight & Caching
- Data Pipeline Metrics: Freshness, Throughput, Failures & Cost
- API Usage, Rate Limits & Quotas: Token Buckets, Retries and Cost
- SaaS License Optimisation: Seat Utilisation, True-Ups & Software Spend
- Storage Math: RAID Capacity, Backup Windows & Retention Costs
- Mobile App Stability Metrics: Crash-Free Users, ANRs & Startup Time
- Container Resource Sizing: CPU & Memory Requests, Node Packing & Cost
- IT Asset Lifecycle & Refresh Planning: Laptops, TCO & Replacement Cycles
- Password Strength by the Numbers: Entropy, Crack Time & Policy Design
- Colour Contrast & Accessibility Math: WCAG Contrast Ratios & Relative Luminance
- CDN & Caching Economics: Hit Ratio, Origin Offload & Egress Cost
- Network Math: Bandwidth, Latency, Throughput & Transfer Time
- Database Capacity Planning: Storage Growth, Index Size, IOPS & Query Cost
- IoT Battery Life & Power Budgets: Duty Cycles, Sleep Current & Energy Harvesting
- Game Economy Design: Faucets & Sinks, Drop Rates, Progression Curves & Monetisation
- UPS & Backup Power Sizing: VA vs Watts, Runtime, Batteries & Generators
- Electronics for Makers: LED Resistors, Dividers, ADC Scaling, Thermistors, RC Timing & PWM
- Ad-Funded Apps & Games: Impressions per User, Fill Rate, eCPM, Rewarded Video & Hybrid ARPDAU
- Observability Costs & Signals: Log Volumes, Metric Cardinality, Trace Sampling, Retention Tiers & Alert Noise
- Cloud Migration Business Case: On-Prem TCO, Workload Waves, Dual-Running Costs, Licence Changes & Payback
- Wireless Link Budgets: dBm and mW, Free-Space Path Loss, Antenna Gain, Wall Losses, Fade Margin & Coverage Range
- Robotics by the Numbers: Wheel Encoders, Odometry, Two-Link Arm Kinematics, Motor Gearing & PID Control Steps
- Quantum Computing by Hand: Qubit Amplitudes, Gates as Small Matrices, Measurement Probabilities, Entanglement & a Two-Qubit Search
- How Compression Works by Hand: Run-Length Encoding, Symbol Frequencies, Entropy, Huffman Codes, Base-64 Overhead & Lossy Quantisation
- Number Systems for Computing: Binary, Hexadecimal, Bit Flags, Two's Complement, Fixed & Floating Point and Storage Units
- Algorithms by the Numbers: Counting Steps, Growth Rates, Binary Search, Sorting Comparisons, Hash Table Load & Caching
- Game Development Math: Vectors & Movement, Frame-Rate Independence, Easing Curves, Collision Checks, Damage Formulas & Difficulty Curves
- Operating System Scheduling by Hand: FCFS, Shortest Job First, Round Robin, Priorities, Page Replacement & Disk Scheduling
- Error Detection & Correction by Hand: Parity Bits, Check Digits, Checksums, CRC Division & Hamming Codes
- Video Surveillance Storage & Bandwidth Sizing: Cameras, Bitrates, Motion Recording, Retention Days, Disks & Network Load
- CPU Caches by Hand: Address Bits, Direct-Mapped & Set-Associative Caches, Hit/Miss Traces, Average Memory Access Time & Multi-Level Caches
- Load Balancing & Hashing by Hand: Round Robin, Weighted & Least-Connections Rules, Hash Mod N, Consistent Hashing Rings & Capacity Headroom
- Dynamic Programming by Hand: Overlapping Subproblems, Memo Tables, Coin Change, Knapsack, Longest Common Subsequence & Grid Paths
- Data Structures by Hand: Arrays, Stacks, Queues & Ring Buffers, Linked Lists, Binary Heaps, Search Trees and Sorting Passes
- How Blockchains Work by Hand: Ledgers, Toy Hashes & Chained Blocks, Merkle Trees, Proof-of-Work Targets, Difficulty Adjustment, Unspent Outputs & Fee Markets
- 3D Graphics by Hand: Vertex Tables, Rotations, Camera Space, Perspective Projection, Screen Mapping, Back-Face Culling, Depth Buffers & Flat Shading
- Programming Logic by Hand: Variables, Trace Tables, Conditions, Loops, Arrays & Strings, Functions, Recursion and Debugging Off-by-One Errors
AI & Data Science (41)
- Machine Learning in Excel: How Models Really Work
- Neural Networks by Hand in Excel
- Recommendation Systems & Text Analytics in Excel
- AI for Business: ROI, Token Costs & Automation Savings
- Evaluating AI & Search: Ranking and LLM Evaluation Metrics
- LLM Cost & Token Economics: Pricing AI Features
- Reinforcement Learning by Hand: Bandits, Q-Learning & Value Iteration
- Computer Vision Metrics: IoU, Precision-Recall & mAP by Hand
- AI Fairness & Bias Metrics: Parity, Equal Opportunity & Calibration by Group
- Anomaly Detection Basics: Z-Scores, IQR, Seasonality & Alert Precision
- Machine Learning Forecasting: Lag Features, Train/Test Splits & Error Metrics
- Text Classification by Hand: Naive Bayes Spam Filter & Sentiment
- Decision Trees & Ensembles by Hand: Entropy, Information Gain, Random Forests & Boosting
- Embeddings & Vector Search by Hand: Cosine Similarity, Top-k Retrieval & Recall
- AI Chatbot Support Metrics: Containment, Deflection, CSAT & Cost per Resolution
- Clustering Methods by Hand: Hierarchical, k-Medoids, Silhouette & DBSCAN
- Speech Recognition Metrics: Word Error Rate, CER & Real-Time Factor
- Genetic Algorithms by Hand: Selection, Crossover, Mutation & Fitness
- GPU Inference Capacity Planning: Tokens per Second, Batching, Memory & Cost
- ML Model Monitoring: Data Drift, PSI, KS Test & Performance Decay
- Data Labeling for AI: Inter-Annotator Agreement, Label Quality & Labeling Cost
- Image Processing by Hand: Pixels, Convolution Kernels, Edges & Pooling
- Feature Engineering for Machine Learning: Encoding, Scaling, Binning & Leakage
- Fuzzy Matching & Record Linkage: Normalising Names, Similarity Scores & Duplicates
- AI Model Training & Fine-Tuning Budgets: Tokens, Compute, GPU-Hours, Experiment Grids & Scaling Curves
- AI Agents by the Numbers: Step Success Rates, Retries, Tool-Call Costs, Human Hand-Offs & Cost per Completed Task
- How Language Models Work by Hand: Tokens, Embeddings, Attention Weights, Softmax & Sampling with Temperature
- How Neural Networks Learn: Gradient Descent, Momentum, RMSProp, Adam, Learning-Rate Schedules & Warm-Up by Hand
- How Image Generators Work by Hand: Noise Schedules, Forward Noising, Denoising Steps, Guidance Scale & Latent Sizes
- Document AI in Operations: Field Extraction Accuracy, Confidence Thresholds, Straight-Through Processing, Review Queues & Cost per Document
- Explaining Model Predictions by Hand: Contributions, Shapley Values, Permutation Importance, Partial Dependence & Counterfactuals
- How Text Prediction Worked Before Transformers: n-Gram Counts, Smoothing, Backoff, Perplexity, Autocomplete & Text Generation by Hand
- Cross-Validation & Hyperparameter Tuning by Hand: Train/Validation/Test Splits, k-Fold Scores, Grid Search, Overfitting Curves & Data Leakage
- Hidden Markov Models by Hand: States & Emissions, the Forward Algorithm, Viterbi Decoding, Smoothing & Simple Learning from Counts
- The Kalman Filter by Hand: Noisy Measurements, Predict & Update Steps, Kalman Gain, Constant-Velocity Tracking, Sensor Fusion & Tuning
- How Tokenizers Work by Hand: Characters & Pairs, Byte-Pair Merges, Vocabulary Size, Tokens per Word, Sequence Length & Embedding-Table Costs
- Recurrent Networks by Hand: Hidden States, Unrolling Through Time, Vanishing Gradients, LSTM Gates, GRU Cells & Sequence Prediction
- Support Vector Machines by Hand: Separating Lines, Margins, Hinge Loss, Soft Margins, Kernel Tables & Support Vectors
- Autoencoders & GANs by Hand: Encoders, Bottlenecks, Reconstruction Error, Anomaly Scores, Latent Space, Variational Sampling, Generator vs Discriminator Losses & Mode Collapse
- Scoring Generated Text by Hand: N-Gram Overlap, Clipped Precision, BLEU & Brevity Penalty, ROUGE Recall, Token F1, Exact Match & Agreement with Human Ratings
- Imbalanced Data by Hand: The Accuracy Trap, Balanced Metrics, Resampling, Synthetic Minority Samples, Class Weights, Cost-Based Thresholds & Probability Correction
Math & Teaching (27)
- Business Math Essentials
- Probability & Combinatorics for Decisions
- Excel for Teachers: Gradebooks & Class Analytics
- Algebra & Functions with Spreadsheets
- GMAT & GRE-Style Quant Practice
- Actuarial Math Basics: Life Tables, Annuities & Premiums
- Calculus with Spreadsheets: Rates of Change, Optimisation & Area
- Trigonometry & Geometry with Spreadsheets
- Modular Arithmetic & Cryptography Basics: From Caesar to Toy RSA
- Linear Programming by Hand: Graphical Method, Corner Points & Transportation
- Linear Algebra with Spreadsheets: Vectors, Matrices & Systems of Equations
- Combinatorics: Counting Principles, Permutations, Combinations & Probability
- Sequences & Series: Arithmetic, Geometric & Their Money Uses
- Logic, Sets & Truth Tables with Spreadsheets
- Game Theory with Spreadsheets: Payoff Matrices, Nash Equilibria & Mixed Strategies
- Numerical Methods: Bisection, Newton-Raphson, Fixed-Point & Numerical Integration Accuracy
- Unit Conversions & Dimensional Analysis: Factor Chains, Rates & Mixed Units
- Coordinate Geometry with Spreadsheets: Distance, Slopes, Lines, Circles & Polygons
- Voting Methods & Social Choice: Plurality, Borda, Instant Runoff & Condorcet
- Chaos & Iteration in Spreadsheets: The Logistic Map, Fixed Points & Fractals
- Differential Equations in Spreadsheets: Euler, Heun & Runge–Kutta Methods
- Auction Math: First-Price, Second-Price, Reserve Prices & the Winner's Curse
- Apportionment Math: Hamilton, Jefferson, Webster & Huntington–Hill
- Probability Paradoxes in Spreadsheets: Monty Hall, Birthdays, Simpson's & Base Rates
- Vectors & 3D Geometry in Spreadsheets: Dot & Cross Products, Planes & Projections
- Markov Chains in Spreadsheets: Transition Matrices, Steady States & Board Games
- Complex Numbers in Spreadsheets: Rectangular & Polar Form, Arithmetic, Powers & Roots, Rotations and AC Phasors
Health & Fitness (20)
- Nutrition & Fitness Math
- Sports Analytics in Excel
- Running & Endurance Training Math
- Epidemiology & Health Statistics in Excel
- Health Insurance Plan Math: Deductibles, Coinsurance & Out-of-Pocket
- Dosage Calculations for Nursing & Pharmacy
- Health Economics: QALYs, ICER & Cost-Effectiveness
- Wearable Health Data: Steps, Heart Rate, HRV & Sleep Analysis
- Clinical Trial Statistics: Sample Size, Randomisation & Survival Curves
- Epidemic Modeling: SIR Models, R0 & Herd Immunity in Excel
- Pharmacokinetics Basics: Half-Life, Clearance & Steady State
- Psychometrics in Excel: Scale Scoring, Reliability & Item Analysis
- Workplace Safety Metrics: TRIR, LTIFR, Severity Rates & Leading Indicators
- Vaccination Program Logistics: Doses, Wastage, Cold Chain & Clinic Capacity
- Growth Charts & Percentiles: Z-Scores, LMS Method & BMI-for-Age
- EMS Response Time Analytics: Percentiles, Coverage & Unit-Hour Utilisation
- Glucose Data Analysis: Time in Range, GMI & Variability from CGM Data
- Screening Programme Analytics: PPV by Prevalence, Yield, Cost per Case & Biases
- Blood Pressure Data Analysis: Home Readings, Averages, Categories & Trends
- Pharmacovigilance Signal Detection: PRR, ROR, Chi-Square & Case Counts
Science & Engineering (36)
- Engineering Economics in Excel
- Chemistry Calculations with Spreadsheets
- Physics with Spreadsheets: Motion, Forces & Energy
- Electrical Engineering Basics: Circuits, Power & Energy
- Statistics for Lab Sciences: Calibration, Uncertainty & QC
- Climate & Weather Data Analysis in Excel
- Biology Math: Genetics, Population Growth & Lab Calculations
- Astronomy Calculations: Kepler, Distances, Magnitudes & Light
- Hydrology & Water Resources: Rainfall, Runoff & Reservoirs
- Mechanics of Materials: Stress, Strain, Beams & Safety Factors
- Heat Transfer & Thermodynamics for Buildings and Machines
- Air Quality Data Analysis: AQI, PM2.5 Averages & Exceedances
- Wind Energy Calculations: Power Curves, Capacity Factor & Weibull Wind
- Soil Science & Irrigation Calculations for Agronomy
- Radioactivity & Decay Calculations: Half-Life, Activity & Dosimetry Basics
- Optics & Light Calculations: Refraction, Lenses, Mirrors & Photometry
- Acoustics & Decibels: Sound Levels, Adding Sources & Noise Exposure
- Earthquake Seismology: Magnitudes, Energy, Epicentres & Recurrence
- Electric Vehicle Range & Energy: kWh/100 km, Charging Time & Trip Planning
- Ecology Field Methods: Quadrats, Mark-Recapture & Population Estimates
- Food Science Calculations: Shelf Life, Q10, Water Activity & Microbial Growth
- Photography Math: Exposure Value, f-Stops, Depth of Field & Hyperfocal Distance
- Rocket Math: Thrust, Impulse, the Rocket Equation & Flight Simulation
- Tides & Ocean Math: Harmonic Constituents, Tide Tables & Wave Calculations
- Brewing Science: Gravity, ABV, Attenuation, Bitterness & Colour
- Personal Carbon Footprint: Home Energy, Travel, Food & Reduction Plans
- Exoplanet Math: Transit Depth, Orbits, Habitable Zones & Radial Velocity
- Astrophotography & Night-Sky Math: Image Scale, Telescope Optics, Star Trails, Stacking & Moon Phases
- Electrochemistry by the Numbers: Faraday's Laws, Plating Mass & Thickness, Current Efficiency, Cell Potentials, the Nernst Equation & Battery Capacity
- Signal Processing by Hand: Sampling & Aliasing, Quantisation, the Discrete Fourier Transform, Spectra, Windows, Moving-Average & Exponential Filters and Convolution
- Fluid Mechanics by the Numbers: Hydrostatics, Continuity, Bernoulli, Reynolds Number, Pipe Friction, Minor Losses, System Curves & Pump Operating Points
- Control Systems by Hand: Open & Closed Loops, First- and Second-Order Responses, Steady-State Error, Dead Time, Stability Checks, Frequency Response in Decibels & Tuning Tables
- Digital Logic by Hand: Gates, Truth Tables, Karnaugh Maps, Binary Adders, Multiplexers & Decoders, Flip-Flops, Counters, Shift Registers & State Machines
- Analog Electronics by Hand: Diodes & Rectifiers, Smoothing Ripple, Zener Regulators, Transistor Switches, Op-Amp Amplifiers, Active Filters, Comparators & Real-World Limits
- Engineering Statics by Hand: Force Vectors, Moments, Free-Body Equilibrium, Support Reactions, Trusses by Joints and Sections, Centroids, Second Moments of Area & Friction
- Soil Mechanics by Hand: Phase Relations, Grading & Plasticity, Compaction, Effective Stress, Permeability, Consolidation Settlement, Shear Strength & Bearing Capacity
Legal & Compliance (8)
- Court Deadlines & Limitation Periods: Business-Day Counting, Holidays & Docket Calendars
- Legal Billing & Client Trust Ledgers: 6-Minute Increments, Fee Arrangements & Reconciliations
- Damages, Interest & Settlement Math: Lost Profits, Statutory Interest & Case Value
- Compliance Risk Scoring: Obligations, Inherent vs Residual Risk & Heat Maps
- KYC Risk Rating & Transaction Monitoring: Customer Scores, Alert Rules & Case Backlogs
- Document Review & E-Discovery Math: Data Volumes, Culling, Review Rates, Sampling & Recall
- Contract Operations by the Numbers: Request Intake, Review Cycle Times, Clause Deviations, Renewal & Notice Calendars and Contract Value Under Management
- Patent & Trademark Portfolio Budgets: Families and Countries, Renewal Fee Schedules, Due-Date Calendars, Keep-or-Drop Decisions & Cost per Product
Home & Life Planning (11)
- Plan a Wedding by the Numbers: Budget Split, Guest List, Seating & Vendor Payments
- Home Renovation Planner: Room Measurements, Material Quantities, Quotes & Schedules
- Trip Planning Spreadsheet: Itineraries, Multi-Currency Budgets & Group Cost Splitting
- Buying a Car by the Numbers: Total Cost of Ownership, Loan vs Lease & Resale Value
- Household Admin Workbook: Bill Calendars, Shared Costs, Subscriptions & Home Inventory
- Moving Home by the Numbers: Inventory Volume, Boxes, Van Size, Quotes, Timeline & Overlap Costs
- Smart Shopping Math: Unit Prices, Pack Sizes, Multi-Buy Offers, Coupons and a Personal Price Book
- Commuting by the Numbers: Car, Public Transport, Bike & Remote Days – Cost per Trip, Pass Break-Even, Time Value & CO₂
- Phone & Internet Plans by the Numbers: Data Use, Plan Choice, Contract vs Device-Free Costs, Family Plans, Home Speed Needs & Switching
- What Your Home Appliances Really Cost: Watts to kWh, Cost per Cycle, Standby, Replacement Payback, Time-of-Use Timing & a Home Energy Plan
- Student Budget for University Life: Semester Costs, Rent & Shared Flats, Part-Time Income, Study vs Work Hours, Savings Targets & a Monthly Plan
Teaching & School Admin (7)
- School Timetabling & Staffing: Classes, Teacher Loads, Room Use & Cover
- School Budgeting & Enrolment Forecasting: Per-Pupil Funding, Staff Costs & Reserves
- Running a Tutoring or Lessons Business: Rates, Packages, Group Lessons, Terms & Cancellations
- Creating & Selling Online Courses: Lesson Plans, Production Hours, Pricing, Launch Funnels & Completion Rates
- Study Smarter with Numbers: Study Hours, Spaced-Repetition Schedules, Exam Weights & Target Scores
- Planning a Thesis or Dissertation: Word Budgets, Source Matrices, Milestones, Writing Pace & Feedback Rounds
- Exam Marking & Grade Boundaries: Mark Schemes, Double Marking, Moderation Adjustments, Boundary Setting from Distributions & Component Weighting
Nonprofit & Fundraising (8)
- Nonprofit Impact Measurement: Indicators, Outcomes, Cost per Outcome & SROI
- Club & Small Charity Treasurer: Dues, Cash Book, Bank Reconciliation & Annual Accounts
- Volunteer Programme Management: Recruitment Funnels, Shift Coverage, Retention & the Value of Volunteer Time
- Grant Seeking by the Numbers: Funder Research, Fit Scores, Pipeline Value, Deadlines & Reporting Calendars
- Capital Campaigns & Major Gifts: Gift Range Charts, Prospect Ratios, Pledge Schedules & Campaign Cash Flow
- Online & Peer-to-Peer Fundraising: Fundraiser Pages, Giving Days, Matching Gifts, Appeal Emails & Cost per Donor
- Humanitarian Aid Logistics: Needs Estimates, Relief Kits, Pipeline Planning, Warehouse Stock, Last-Mile Distribution & Cost per Beneficiary
- Running a Charity Shop: Donations In, Sorting & Grading, Pricing by Category, Stock Rotation, Volunteer Hours and Profit for the Cause
Agriculture & Farming (10)
- Livestock Feed Rations: Dry Matter, Pearson Square, Least-Cost Mixes & Feed Budgets
- Fertiliser & Nutrient Planning: Soil Tests, NPK Rates, Manure Value & Spreader Checks
- Market Garden Planning: Beds, Plant Spacing, Seed Quantities, Succession Sowing & Veg-Box Pricing
- Grazing & Pasture Planning: Stocking Rates, Pasture Cover, Rotations & Feed Wedges
- Beekeeping by the Numbers: Colonies, Mite Counts, Feeding, Splits & Honey Harvest
- Grain Harvest & Storage by the Numbers: Harvest Capacity, Moisture Shrink, Drying Costs, Bin Volumes & Store-or-Sell
- Rainwater Harvesting for the Garden: Roof Catchment, Monthly Yield, Garden Water Demand, Tank Sizing, Overflow Days & Payback
- Laying Hen & Egg Farm Economics: Flock Size, Laying Curves, Egg Grading Mix, Feed per Dozen, Flock Replacement & Margin per Bird
- Sheep & Goat Flock Economics: Flock Structure, Lambing & Kidding Rates, Growth to Sale Weight, Feed Budgets, Fibre & Milk Income and Margin per Ewe
- Christmas Tree Farm Economics: Planting Cohorts, Survival & Grade Mix, Years to Harvest, Cost per Tree, Choose-and-Cut vs Wholesale Pricing, the December Rush and the Cash-Flow J-Curve
Sports & Coaching (10)
- Sports Club Finances: Membership Fees, Arrears, Budgets & Fundraising Events
- Coaching Season Planner: Periodization, Playing Time & Tournament Scheduling
- Cycling by the Numbers: Gearing, Power Zones, Normalised Power, Training Load & Climbing
- Golf Stats & Handicap Math: Score Differentials, Net Scores, Club Gapping & Strokes Gained
- Swimming & Triathlon by the Numbers: Pace per 100, Critical Swim Speed, Stroke Metrics & Race-Day Splits
- Organising Running & Cycling Events: Entries, Wave Starts, Course Capacity, Aid-Station Supplies & Event Budgets
- Rowing & Indoor Rowing by the Numbers: Split per 500 m, Watts from Pace, Stroke Rate, Interval Sessions & Race Plans
- Fantasy Sports League Team Building: Points Rules, Value per Price, Budget-Constrained Squads, Captain Picks & Transfer Planning
- Tennis Match Statistics: Serve & Return Points, Break Points, Point-Win Probabilities, Game & Set Win Chances and Match Reports
- Strength Training Programming by Numbers: Training Max & Percentages, Plate Loading, Effort Tables, Volume Load, Periodisation Blocks & Progression
Creative Business (10)
- Pricing Photo & Video Shoots: Day Rates, Crew Overtime, Kit Hire, Usage Licences & Job Wrap-Up
- Running a Creative Studio by the Numbers: Gear Depreciation, Buy vs Rent, Team Utilisation & Project Margins
- Video Production Math: Frame Rates, Timecode, Bitrates, Storage & Delivery Specs
- Music Production Math: Tempo, Delay Times, Pitch, Sample Rates, Gain & Loudness
- Print & Graphic Design Production: Resolution, Bleed, Imposition, Paper & Type Scales
- Interior Design by the Numbers: Space Planning, Clearances, Rugs, Curtains, Wallpaper & Budgets
- Gigging Musicians by the Numbers: Gig Offers, Band Splits, Merch Margins, Tour Budgets, Break-Even Crowds & the Payout Sheet
- Animation Production Budgets: Frames & Shot Lists, Artist Days per Second, Render Time & Farm Costs, Schedules and Cost per Finished Minute
- Theatre & Stage Production Budgets: Rehearsal Weeks, Cast & Crew Costs, Royalties, Seat Pricing Zones, Box-Office Break-Even & Touring Deals
- UX Research by the Numbers: Task Success, Time on Task, Questionnaire Scores, Problems Found per Tester, Card Sorting and Target-Size Laws
Energy & Sustainability (8)
- Product Carbon Footprint: Life-Cycle Stages, Emission Factors, Hotspots & Eco-Design
- Energy Audit Math: End Uses, Lighting, Motors, Compressed Air, Heat Pumps & Verified Savings
- Off-Grid Solar Systems: Load Lists, Battery Banks, Panel Sizing, Cables & Monthly Energy Balance
- Electricity Markets & the Power Grid: Load Curves, Merit-Order Dispatch, Reserve Margins & Wholesale Prices
- Hydrogen & Power-to-X by the Numbers: Electrolyser Output, Efficiency Chains, Storage & Cost per Kilogram
- Carbon Credits & Offset Projects by the Numbers: Baselines, Buffers, Vintages, Issuance & Cost per Tonne
- Biogas Plant Economics: Feedstock Mix, Gas Yields, Methane Content, Electricity & Heat Output, Digestate, Feed-In Revenue and Payback
- Small Hydropower Economics: Head & Flow, Power Output, Flow Duration Curves, Annual Energy, Residual Flows, Feed-In Revenue and Payback
Kitchen & Food at Home (6)
- Recipe Scaling & Kitchen Conversions: Servings, Cups to Grams, Pan Sizes & Yields
- Bread & Sourdough Formulas: Total Hydration, Starter Builds, Dough Temperature & Timing
- Roasting, Grilling & Low-and-Slow Timing: Cook Times, Resting, Yields & Dinner Schedules
- Coffee & Tea Brewing Math: Brew Ratios, Extraction, Water Recipes & Cost per Cup
- Celebration Cakes by the Numbers: Servings per Tier, Frosting & Fondant Quantities, Ganache Ratios & Custom-Cake Pricing
- Cocktail & Mocktail Math: Ratios, Dilution, Drink Strength, Batched Recipes & Party Quantities
Outdoors & Navigation (7)
- Hike & Trek Planning: Walking Times, Elevation, Daylight, Water & Pack Weight
- Map & Compass Navigation: Scales, Grid References, Bearings, Declination & Slopes
- Boat Navigation Math: Speed–Time–Distance, Set & Drift, Fuel Range & Anchoring
- Drone Flight Planning Math: Flight Time, Range, Wind, Mapping Overlap & Image Resolution
- Camping & Expedition Logistics: Food Rations, Stove Fuel, Water Treatment & Gear Weight
- Weather Math for the Outdoors: Lapse Rates, Dew Point, Cloud Base, Pressure Trends & Wind Chill
- GPS Treasure Hunt Math: Coordinate Formats, Distances & Bearings, Waypoint Projection, Puzzle Checksums and Multi-Stage Final Coordinates
Pets & Animal Care (7)
- Pet Nutrition by the Numbers: Energy Needs, Portions, Treat Budgets & Weight Plans
- The True Cost of a Pet: First-Year Costs, Lifetime Budgets & Insurance vs Saving
- Aquarium Math: Tank Volumes, Water Changes, Dosing & Stocking
- Tracking Growth & Care: Weight Curves, Body Condition, Age Equivalents & Care Calendars
- Dog Walking & Pet Sitting Business Math: Pricing, Group Walks, Routes & Capacity
- Dog Training by the Numbers: Session Logs, Success Rates, Criteria Steps & Progress Charts
- Horse Keeping by the Numbers: Livery Options, Hay & Bedding per Season, Farrier & Care Calendars, Shared Horses, Transport and Cost per Ride
Crafts & Handmade (9)
- Knitting & Crochet Math: Gauge, Cast-On Counts, Even Increases, Yarn Amounts & Resizing
- Sewing & Quilting Math: Cutting Sizes, Seam Allowances, Fabric Yardage, Binding & Size Grading
- Pottery & Ceramics Math: Clay Shrinkage, Glaze Batches, Specific Gravity & Kiln Firing Costs
- Selling Handmade: Material Costs, Pricing Formulas, Sales Channels, Craft Fairs & Batch Planning
- Jewellery Making Math: Ring Sizes, Metal Weights, Alloy Purity, Bead Counts & Pricing Pieces
- Embroidery & Cross-Stitch Math: Fabric Count, Finished Sizes, Thread Amounts, Hoops & Pattern Charts
- Resin Casting Math: Mould Volumes, Mix Ratios by Weight & Volume, Batch Sizes, Pour Layers, Pigment Shares and Cost per Piece
- Leathercraft Math: Hide Areas & Yield, Thickness Conversions, Pattern Layouts, Stitch Counts & Thread Length, Edge Finishing and Pricing per Piece
- Candle Making Math: Container Volumes, Wax Weights, Fragrance & Dye Loads by Percentage, Batch Sizes, Cost per Candle and Pricing
Hobbies & Games (9)
- Music Theory by Numbers: Notes as Numbers, Intervals, Scales from Step Patterns, Chords, Transposition, Fret Positions & Rhythm
- Model Railway & Scale Modelling Math: Scale Conversions, Scale Speed, Gradients & Helixes, Curve Radii, Track Plans and Fast-Clock Timetables
- Tabletop Game Design Math: Dice Distributions, Target Numbers, Advantage Rolls, Expected Damage, Card Draw Odds & Point-Cost Balancing
- Woodworking Project Math: Cut Lists from Drawings, Joinery Allowances, Board Yield & Cutting Plans, Wood Movement, Finishing and Project Pricing
- Family History by the Numbers: Generations & Ancestor Counts, Pedigree Numbering, Cousin Relationships, Date Estimates and Research Trackers
- Drawing & Painting by Numbers: Proportions, Grid Enlargement, Perspective, Composition Grids, Colour-Mixing Ratios, Canvas Sizes & Framing
- Collecting by the Numbers: Catalogue Values, Condition Grades, Set Completion, Auction Results with Fees, Insurance Values & a Collection Index
- Amateur Radio Antenna & Feedline Math: Wavelengths, Dipole & Vertical Lengths, SWR & Mismatch Loss, Coax Loss, ERP and Logbook Statistics
- Chess by the Numbers: Standings, Rating Expectations & Updates, Performance Ratings, Swiss Pairings, Tie-Breaks, Opening Statistics & Time Controls
Cybersecurity (48)
- Linux for Beginners
- Account Takeover Defense: Protect Email & Social Accounts
- Anonymity & OPSEC: Tor, VPNs and Privacy Discipline
- Phishing & Scam Defense: Spot, Stop and Report
- GRC & Compliance: Risk, Frameworks and Audits
- Kali Linux for Beginners
- Windows for Beginners
- macOS for Beginners
- macOS for Hackers
- Android Basics: ADB, APKs and a Safe Test Setup
- iOS Basics: Security Model, App Bundles and Safe Test Setup
- Mobile App Resilience: Anti-Tamper Controls for iOS & Android
- Mobile Forensics & Incident Response for iOS and Android
- Analyzing Mobile Malware Safely
- Securing AI Features in Mobile & Web Apps
- Pentest Reports That Get Acted On
- Cybersecurity Fundamentals
- SOC Analyst & Blue Team: Log Investigation
- Digital Forensics & Incident Response (DFIR)
- Network Protocols & Packet Analysis
- Network & System Security Testing
- OSINT: Open-Source Intelligence
- Cloud Security
- Container & Kubernetes Security
- API Security
- Web Application Security
- Web3 & Smart Contract Security
- AI & LLM Security
- Bug Bounty Mastery
- Linux for Security Work
- Windows Internals for Security Work
- PowerShell for Security Work
- Python for Security Automation
- Memory Corruption Basics for Defenders
- Assembly: Reading and Debugging
- Active Directory Security & Defense
- Memory Corruption & ROP Fundamentals
- Malware Analysis & Reverse Engineering
- Man-in-the-Middle Attacks & Defense
- Wireless Security: WPA2, WPA3 & PMKID
- Phishing & Social Engineering Defense
- IoT & Hardware Security
- Applied Cryptography: How It Works and Breaks
- Android App Security Testing
- Android Native Memory Safety & Mitigations
- Android Fuzzing and Vulnerability Research
- iOS Application Security
- Mobile App Penetration Testing
Guides
Excel formulas (5)
- SQL JOIN Explained with Excel: INNER vs LEFT JOIN
- Law of Cosines in Excel: Find a Side or an Angle
- Shoelace Formula in Excel: Polygon Area from Coordinates
- Borda Count in Excel: SUMIF, SUMPRODUCT & Example
- D'Hondt Method Calculation: Step-by-Step Example
Accounting & financial statements (1)
Valuation, investing & credit (2)
- LCOE Formula: Levelized Cost of Energy, Solar Example
- Present Worth Analysis Example: Compare Two Machines
Business & operations (9)
- Food Cost Percentage Formula: Restaurant Worked Example
- Markup vs Margin: Formulas, Conversion Table, Example
- Time Charter Equivalent (TCE): Formula and Worked Example
- TRIR Calculation: Formula, Example and Excel Calculator
- How to Find a Nash Equilibrium in a Payoff Matrix (Excel)
- Baker's Percentage Formula: Calculate and Scale a Recipe
- Board Feet Formula: How to Calculate Board Feet
- Angel's Share Calculation: Whisky Cask Loss per Year
- Engine Displacement Formula: cc, Liters and Cubic Inches
Data, tech, science & health (37)
- Confusion Matrix, Precision and Recall: Excel Example
- Annual Loss Expectancy (ALE) Formula: SLE × ARO Example
- MTBF, MTTR and Availability: Formulas and Excel Example
- TDEE Formula: How to Calculate TDEE (Mifflin-St Jeor)
- Limiting Reagent Example: Stoichiometry Step by Step
- LLM Token Cost Calculator: Cost per Request in Excel
- Sensitivity and Specificity Calculation with PPV and NPV
- NDCG and MRR Explained: Calculation with Worked Examples
- LOD and LOQ from a Calibration Curve in Excel (3.3σ/S)
- Hardy-Weinberg Equation in Excel: Calculator and Examples
- Kaplan-Meier Curve in Excel: Survival Table Step by Step
- Intersection over Union (IoU): Formula and Worked Example
- Subnet Calculator in Excel: CIDR, Network, Broadcast, Hosts
- Disparate Impact Ratio and the Four-Fifths Rule, Explained
- SIR Model in Excel: Step-by-Step Epidemic Model with R0
- Half-Life and Elimination Rate Constant Calculator (Excel)
- Cronbach's Alpha in Excel: Formula, Example & Item Analysis
- AQI Calculation from PM2.5: Breakpoints and Formula
- Information Gain and Entropy: Worked Example in Excel
- Cosine Similarity in Excel: SUMPRODUCT Formula and Example
- Radiocarbon Dating Calculation: C-14 Age Formula in Excel
- Thin Lens Equation Calculator: Image Distance, Magnification
- Silhouette Score Explained: Formula and Worked Example
- Newton-Raphson Method in Excel: Step-by-Step Iteration Table
- Adding Decibels: Formula, Calculator & Excel Example
- Time in Range Calculation from CGM Data (TIR) in Excel
- Contrast Ratio Formula (WCAG): Luminance & Excel Example
- Q10 Temperature Coefficient: Calculation & Shelf Life
- Population Stability Index (PSI): Formula & Excel Example
- Hyperfocal Distance Formula: Calculator Table in Excel
- Euler's Method in Excel: Step-by-Step Table with Error
- Cohen's Kappa Calculation in Excel, with a Worked Example
- Monty Hall Problem Explained with a Table (and Bayes)
- ABV Formula from OG and FG: Simple vs Accurate
- Fuzzy Matching in Excel with Jaccard Similarity
- Proportional Reporting Ratio (PRR) Calculation in Excel
- Transit Depth Formula: Exoplanet Radius from a Light Curve