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About CalcKit

CalcKit is a free library of online calculators — 156 tools across 8 categories, from GPA and grades to paychecks, health, home projects and games. Every result is instant, and every tool is free.

What you can calculate

EducationGPA, grades, test scores and AP calculators. FinancePaychecks, taxes, loans, savings and lottery payouts. Health & FitnessBMI, calories, pace, military fitness tests and dosage. Family & LifePregnancy, baby and child age, and compatibility. Math & StatsStatistics, geometry, chemistry and percentages. GamesGrow a Garden, Palworld, Elden Ring, D&D and fantasy sports. Home & AutoHome improvement costs, materials and car calculators. MoreAstrology, dates, pets and everyday tools.

How our calculators are made

Every tool uses the standard published formula for its calculation — the 4.0 GPA scale, state child support guidelines, official military fitness tables and the like. Each page shows the formula, a worked example you can check, and answers to common questions. Results are estimates for guidance; for legal, medical or tax decisions, always confirm with a professional.

Free, private, no signup

All calculators are free to use, supported by advertising. No account, no sign-up. Calculations run in your browser, so your numbers never leave your device.

Request a calculator

Can’t find the tool you need? Tell us which calculator to build next — we build the most-requested tools first.