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About Calculator Tools
The calculators cover everyday life, health and school: percentages, fractions and scientific calculations, BMI, calories and pregnancy due dates, ages, date differences and time zones. The money calculators (loans, mortgages, interest, salary and tax) have their own Finance Tools hub.
Specialized calculators help with construction and DIY projects, such as concrete, paint, tiles and flooring, with electronics and science, such as Ohm's law, resistor colors and molar mass, and with geometry, unit conversions and grades.
Every calculator is free, gives an instant result as you type and runs in your browser, on a computer, tablet or phone.
Frequently asked questions
Yes. Every calculator is free to use, with no sign-up and no limit.
The calculators use standard formulas and show their results instantly. Health and construction results are estimates: check important decisions with a professional.
No. The calculations run in your browser, so the numbers you enter stay on your device.
Yes. Every calculator is designed to work in a mobile browser as well as on a desktop computer.
Need help?
Found an issue with this tool? Let our team know.