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Unit Converter

Convert length, weight, temperature, volume, area and speed — instantly in your browser.

How it works

1
Select a category
Choose from length, weight, temperature, volume, area, speed, time, data storage, pressure, energy and more.
2
Type in any field
Enter a value in any unit field. All other unit fields update instantly — conversions work in both directions.
3
High precision
All conversions use exact mathematical formulas, not rounded lookup tables, ensuring accurate results for scientific and engineering use.
4
100% local
No data leaves your browser. All calculations run client-side with no server or API calls.

Frequently Asked Questions

Is the Unit Converter free?

Yes, 100% free. No account, no limits.

Is any data sent to a server?

No. All unit conversions run locally in your browser using exact mathematical formulas.

What categories of units are supported?

Length, weight/mass, temperature, volume, area, speed, time, data storage, pressure, energy, power and angle.

How precise are the conversions?

Conversions use double-precision floating point arithmetic with exact conversion factors, accurate to at least 15 significant digits.