Unit Converter — fast, free & in your browser
Convert between units across eight categories, with live results as you type.
This tool runs entirely in your browser. Your files are never uploaded — they stay on your device.
A unit converter you can actually trust. Pick a category, enter a value, choose the units to convert from and to, and the answer updates instantly — no button to press and no waiting.
Everything runs locally in your browser using fixed, well-known conversion factors, so it works offline and keeps no record of what you convert. There are no currencies here: exchange rates change by the minute, but a metre is always a metre.
How to use Unit Converter
- Choose a category, such as length, weight or temperature.
- Type the value you want to convert.
- Pick the unit to convert from and the unit to convert to.
- Read the converted result — it updates live as you type.
- Use the swap button to reverse the conversion in one click.
Frequently asked questions
Which categories and units are supported?
Eight categories: length, weight/mass, temperature, data storage, area, speed, volume and time. Each offers the most common metric and imperial units, with more added over time.
How accurate are the conversions?
Conversions use standard fixed factors (and the exact formulas for temperature). Results are precise; only the on-screen display is rounded for readability.
Does it convert currencies?
No. This tool only handles physical units with fixed factors. Currency rates change constantly and would need a live data source, which would break the offline, private design.
Is anything I type sent to a server?
No. The converter runs entirely in your browser. Nothing you enter is uploaded, stored or tracked, and it keeps working even with no internet connection.