Unit Converter
Convert length, mass, temperature, area, volume, speed and data units instantly.
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How to use it
- Choose a category: length, mass, area, volume, speed, data size or temperature.
- Enter the value and pick the source and target units — the result updates live.
- The conversion factor (or the offset formula for temperature) is always displayed, so results are verifiable.
- Use Swap to reverse the direction instantly.
About this tool
Covers the common unit families with exact conversion factors for length, mass, area, volume and data, and the correct offset-based formulas for temperature. Results update live, significant digits are preserved sensibly, and the conversion factor used is always displayed.
Your input never leaves the browser: this tool works entirely offline once the page has loaded.
Frequently asked questions
Why do KB and KiB differ?
KB is decimal (1,000 bytes, storage marketing) while KiB is binary (1,024 bytes, what computers actually address). The converter keeps them separate and labels both.
Are the factors exact?
Yes where defined by international agreement — the inch is exactly 25.4 mm, the pound exactly 0.45359237 kg. Temperature uses offset formulas displayed with the result.