Convert between metric, imperial, and US units instantly. All calculations run in your browser — no data is sent to any server. Free, no sign-up, works offline.
This unit converter handles six categories: length, weight, volume, temperature, area, and speed. It covers both metric and imperial/US units, including less common ones like nautical miles, stones, and knots. Temperature conversions use the correct formulas (not just multiplication) to account for different zero points. All calculations happen instantly in your browser — nothing is sent to a server.
Conversions use standard internationally accepted factors and are accurate to 10 significant figures.
Yes. All calculations run in your browser. Once the page has loaded, you can use it with no internet connection.
Length, Weight, Volume, Temperature, Area, and Speed, covering metric, imperial, and US units.
Temperature scales have different zero points, so conversion requires a formula, not just multiplication. The tool handles this automatically.
Yes. Click the ⇄ button to instantly reverse the source and target units.
Yes. US gallons (3.785 L) and UK/Imperial gallons (4.546 L) are listed separately because they are different sizes.
No. All calculations happen locally in your browser. No values are transmitted or stored.
Yes, completely free with no sign-up required and no usage limits.
Everything is calculated locally in your browser — no data is ever sent to a server.