Unit Converter

How It Works

Use our free unit converter to instantly switch between hundreds of measurement units. Enter a value and the result updates in real time — no button needed. Supports weight (kg, lb, oz, stone), length (km, miles, feet, inches), temperature (°C, °F, K), and volume (liters, gallons, fluid ounces). Whether you're cooking, travelling, or working on a science project, accurate conversions are just a click away.

1. Select the measurement category: Weight, Length, Temperature, or Volume.
2. Choose the unit you want to convert from and the unit you want to convert to.
3. Type your value in either field — the other field updates instantly.
4. Use the Swap button to reverse the direction of conversion at any time.
5. Scroll down to see all conversions for the active category at once.

Frequently Asked Questions

How accurate are the conversions?

All conversion factors are based on internationally accepted SI standards. Results are accurate to at least 6 significant figures, which is sufficient for everyday, scientific, and engineering use.

Can I edit both input fields?

Yes. The converter works bidirectionally — you can type in either the 'From' or the 'To' field, and the other will update automatically.

Why does temperature conversion work differently?

Unlike weight or length, temperature scales (Celsius, Fahrenheit, Kelvin) are not proportional — they have different zero points. The converter handles this correctly using the standard formulas.

Is the unit converter free to use?

Yes, completely free and with no sign-up required. Open the page and start converting.

Does it work on mobile?

Yes. The tool is fully responsive and works on smartphones, tablets, and desktop computers.