Frequently Asked Questions

Pick a category, choose the units you want to convert from and to, and type a value. The result appears instantly and updates live as you type — no button required.

Completely free. No sign-up, no downloads, no limits. Convert as often as you like.

Length, weight/mass, temperature, volume, area, speed, time, digital storage, energy, pressure, angle, and fuel economy. More categories may be added over time.

Yes, it's fully bidirectional. Type a value in either field and the other updates automatically. A swap button also lets you flip the from and to units with one tap.

Yes. You can freely convert between metric and imperial units within each category — for example kilometres to miles, kilograms to pounds, litres to US gallons, and Celsius to Fahrenheit.

Yes. Temperature uses proper conversion formulas with the correct offsets, not simple multiplication. For example: °F = (°C × 9/5) + 32, and K = °C + 273.15. Rankine is also supported.

Conversions use precise factors through a common base unit, giving results accurate to 6–7 significant figures — suitable for everyday and most technical use.

Yes, each category shows a panel of frequently used conversions so you can grab common answers instantly without typing a value.

No. Everything runs in your browser and is never stored or sent to a server.

Yes. The layout is fully responsive. Category tabs wrap, selectors stack on small screens, and there is no horizontal overflow on any device.