Calculator

Convert anything to anything

Length, weight, temperature, volume and speed — type a value and see every conversion update instantly. Works offline, too.

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Common conversions

About the unit converter

Conversions use internationally standard factors (NIST / SI). Temperature is handled with proper offset formulas, not simple ratios, so 0 °C correctly becomes 32 °F.

Questions

How accurate is it?

Factors follow SI definitions and are accurate to many decimal places — far beyond everyday needs.

Does it work offline?

Yes. All the maths runs in your browser, so it keeps working without a connection.

Can I convert temperature?

Absolutely — Celsius, Fahrenheit and Kelvin with correct offset handling.

Common conversions

Jump to a ready-made converter for a specific pair — length, weight, temperature, volume and speed conversions. Each page has the formula, a worked example and a reference table.