Every calculator you'll ever need.
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6 categories · 143 calculators34 calcs
Finance
Mortgages, loans, investments, taxes — every money question answered.
22 calcs
Health
BMI, calories, ideal weight, heart rate — tools for a healthier you.
28 calcs
Math
Percentages, fractions, algebra, geometry and more.
31 calcs
Convert
Length, weight, temperature, currency and unit converters.
14 calcs
Date & Time
Age, date difference, time zones and working-days calculators.
14 calcs
Other
Tip splitter, fuel cost, grade calculator and more everyday tools.
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About calcso
calcso is a free, fast calculator hub covering everything from finance and health to unit conversion and time zones. Every calculator works instantly in your browser with no sign-up required. We support English, Spanish, French, German, and Japanese so you can get answers in the language you're most comfortable with. Our tools are built for accuracy, mobile-first, and optimised for Lighthouse scores above 90.