What is a unit converter?
A unit converter translates a value from one measurement unit to another using fixed conversion factors. Length, weight, volume, speed, and most other physical units convert by simple multiplication or division (e.g. 1 mile = 1609.344 metres). Temperature is the main exception — Celsius, Fahrenheit, and Kelvin use offset formulae, not just a multiplier. This tool covers 8 categories with 6–9 units each, all computed locally with no rounding errors beyond JavaScript floating-point.
How to use this tool
- 1 Select a category from the buttons at the top (Length, Weight, Volume, etc.).
- 2 Choose your "From" and "To" units from the dropdowns.
- 3 Enter a value in the left field — the converted result appears instantly on the right.
- 4 Click the swap button (↔) to reverse the conversion.
- 5 The table below shows the equivalent in all units at once.
Frequently asked questions
Which unit categories are supported?
Length, Weight, Volume, Area, Speed, Temperature, Data (bytes/bits), and Pressure. More categories may be added in future.
Why might the result have many decimal places?
Most conversion factors are irrational (e.g. 1 inch = 25.4 mm exactly, but 1 foot = 0.3048 m which is fine; however chain conversions accumulate floating-point rounding). Values are displayed with up to 8 significant figures.
Can I convert between metric and imperial?
Yes — the tool includes both metric (SI) and imperial/US customary units in each category.
Is temperature conversion the same as other units?
No. Temperature has an offset as well as a scale factor, so you cannot just multiply. The tool uses the correct formulae: °C to °F = C × 9/5 + 32; °C to K = C + 273.15.
Is my data uploaded to a server?
No. All conversions are pure arithmetic running locally in your browser. Nothing is transmitted.