Calculation Playbooks
Readable articles for people who want the story behind the calculator: what the formula is doing, where people get tripped up and what to try next.
Date Math Playbook
Countdowns, birthdays, weekdays and leap years.
Time Planning Playbook
Minutes, breaks, movie marathons and sleep-cycle estimates.
Conversion Formula Playbook
Metric, imperial, cooking, geometry and comparison math.
Cooking Math Playbook
Cups, spoons, milliliters, servings and temperature.
Travel and Fitness Playbook
Distance, pace, speed and fuel planning.
Percentage Playbook
Discounts, VAT, tips, splits and rounding.
Value Comparison Playbook
Pizza, subscriptions, unit prices and recurring costs.
Small Money Playbook
Daily habits, subscriptions, streaks and savings goals.
Investment Returns Playbook
ROI, CAGR, dividends, fees and shortcuts.
Crypto Calculation Playbook
Profit, market cap, staking and risk sizing.
Home Bills Playbook
Mortgage, rent, electricity, paint and moving estimates.
Mortgage and Home Cost Guide
Long-form guide to mortgage payments, rent comparisons, closing costs and monthly ownership.
Electricity Bill and Appliance Cost Guide
Watts, kWh, standby power, appliance labels and practical energy estimates.
Work Money Playbook
Paychecks, overtime, invoices, meetings and freelance rates.
Health Estimate Playbook
BMI, calories, protein, hydration and activity estimates.
Calorie Deficit and Maintenance Guide
Research-backed article on calorie targets, activity, protein and diet planning.
Student Calculation Playbook
Grades, finals, GPA, study pacing and reading time.
Study Planning and Exam Grade Guide
Long-form guide to study time, retrieval practice, grades, finals and GPA.
Creator Toolkit Playbook
Text length, timestamps, images, colors, URLs and JSON.
Creator Content and Accessibility SEO Guide
People-first content, internal links, contrast, formatting and web utility workflows.
Mortgage Basics Glossary
Payment, deposit, loan term and interest definitions.
Energy Cost Glossary
Watts, kilowatts, kWh and running-cost terms.
Grade and GPA Glossary
Credits, grade points, weights and course averages.
Web Format Glossary
JSON, URL encoding, aspect ratios and contrast terms.