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Accurate, instant and free tools for your finance, tax, health and conversion needs. No download, no signup.

Popular calculators

Convert between 30 currencies with daily rates.

Body mass index with WHO classification.

Length, weight, volume, temperature, area.

X% of Y, increase, decrease, change.

Exact age in years, months, days, hours.

Monthly payment, total interest, amortization schedule.

Results appear as you type. No button to press.

Every formula is tested and documented. You know exactly how the result is computed.

All tools are available in five languages with local conventions for currencies and formats.