Free Unit Converter
Convert length, weight, temperature and volume units instantly. Nothing leaves your browser.
What this does: converts values between common length, weight, temperature and volume units directly in your browser using plain JavaScript. It is 100% free, requires no signup and no paywall, and works entirely offline once the page has loaded.
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Frequently asked questions
Is this unit converter free to use?
Yes, completely free with no signup, no account, and no paywall. All conversions run instantly in your browser using plain JavaScript, so there is nothing to install and nothing to buy.
Which unit categories does this tool support?
Length (mm, cm, m, km, in, ft, yd, mi), weight (mg, g, kg, oz, lb), temperature (Celsius, Fahrenheit, Kelvin), and volume (ml, l, gal, qt, cup, fl oz). Pick a category, then choose your from and to units.
Does this tool send my data to a server?
No. Every calculation happens locally in your browser using JavaScript. Nothing you type is uploaded, logged, or stored anywhere, and the converter keeps working even if your connection drops after the page loads.