Unit Converter
Free unit converter online. Length, weight, volume, and more.
Convert length, weight, volume, and more
Common searches include km to miles, kg to lbs, and Celsius to Fahrenheit. This converter also covers area, speed, time, data, pressure, energy, power, and angle.
Pick a type, amount, from, and to. Conversion uses standard SI factors.
If you only need temperature, the Temperature Converter page is a shorter path for that search.
unit converter FAQ
Fill in the fields above. The result updates as you type. Empty fields stay blank until you enter a valid number or text.
Yes. Every SmartToolX calculator and converter is free. There is no paywalled result.
No. Inputs stay in your browser unless a tool needs a public API, such as live currency rates or QR image rendering.
We use the same published formulas you would expect from a standard unit converter. Always double-check medical, legal, or large money decisions.