Free calculators & tools
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Finance
Auto Loan Calculator
Free car loan calculator with amortization schedule and extra payment support. See total interest, payoff date…
OpenSales Tax Calculator
Free sales tax calculator. Add tax to a price or back it out of a total. US state sales tax rates built in. No…
OpenSalary to Hourly Converter
Free salary-to-hourly converter. Turn an annual salary into hourly, weekly, and monthly pay, adjusted for hour…
OpenLease vs. Buy Calculator
Compare leasing vs. buying a car over the same ownership window. Total cost of each, breakeven year, and which…
OpenChild Support Calculator
Free child support estimate using a simplified income-shares guideline. Enter both parents' incomes, custody n…
OpenHealth & Fitness
TDEE Calculator
Free TDEE calculator. Calculate total daily energy expenditure and macros for weight loss, maintenance, or mus…
OpenBMI Calculator
Free BMI calculator. Enter weight and height (imperial or metric) for instant BMI and WHO category with a visu…
OpenBMR Calculator
Free BMR calculator. Mifflin-St Jeor or Harris-Benedict, imperial or metric. Find resting calories burned per …
OpenMacro Calculator
Free macro calculator. Split a daily calorie target into protein, fat, and carb grams for balanced, low-carb, …
OpenHome & Construction
Math
Basic Calculator
Free online calculator for quick math. Add, subtract, multiply, divide, percentages. Use keyboard or click. No…
OpenUnit Converter
Free unit converter for length, weight, temperature, volume, speed, and digital storage. Instant, accurate, no…
OpenPythagorean Theorem Calculator
Free Pythagorean theorem calculator. Find the hypotenuse or either leg of a right triangle. See formula work a…
OpenPercentage Calculator
Free percentage calculator. Find X% of Y, what percent X is of Y, or the percent change between two values. In…
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