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Free calculators and converters for everyday maths, money, health and home projects. Start with the quick bar, or press a key below.

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Built to be simple

Each calculator has its own page with the formula explained in plain words, so you can check the working and trust the result. Nothing to install and no account needed. New calculators are added regularly.

Frequently asked questions

Are the calculators free?

Yes. Every calculator is free to use with no sign-up.

Is my data stored?

No. Calculations run in your browser and the numbers you enter are not sent to us.

Are the results exact?

The maths is exact, but real-world loans, taxes and materials vary, so treat results as estimates.