A calm set of free online calculators for everyday math.
Plain-paper calculators for the small number questions that come up during the day — mortgages, tips, tile coverage, due dates, body-mass, and more. No ads, no pop-ups, just answers.
Popular calculators
Monthly payment, total interest, and amortization schedule for any fixed-rate loan.
Body mass index from height and weight, with healthy-range context.
Split a restaurant bill and tip at any percentage across any number of people.
What is X% of Y — and what percent is X of Y.
Exact age in years, months, and days from any birthdate.
How a lump sum or recurring deposit grows when interest compounds.
Browse by category
Finance
6 calcsFree online calculators for loans, mortgages, investments, retirement, taxes, and anything money-related.
Health
5 calcsFree online BMI, calorie, pregnancy, and health calculators — quick answers about your body.
Math
4 calcsFree online percentage, fraction, and math calculators — the tools you actually reach for.
Unit Converters
2 calcsFree online converters for length, weight, temperature, speed, and area — anything with a clear formula.
Date & Time
2 calcsFree online calculators to add or subtract days, count weekdays, figure out age, due dates, or how long until an event.
Construction
1 calcFree online concrete, tile, paint, flooring, lumber, and gravel calculators — estimate materials before you get to the store.
Everyday
1 calcFree online tip, GPA, and everyday calculators — quick answers for daily life.