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📏 Unit Converter Online — Free

Convert length, weight and temperature between metric and imperial units — metres to feet, kilograms to pounds, Celsius to Fahrenheit — instantly.

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How to use this tool

Choose the category: Length, Weight or Temperature.
Enter a value and pick the units to convert from and to.
The answer appears instantly — no button needed.

This free unit converter covers the units people search for most: length in millimetres, centimetres, metres, kilometres, inches, feet, yards and miles; weight in grams, kilograms, tonnes, pounds and ounces; and temperature in Celsius, Fahrenheit and Kelvin. Pick any two units and the conversion is instant, which is handy for recipes, homework, travel and online shopping.

Frequently asked questions

Is this unit converter really free?

Yes — completely free, with no sign-up and no limit on how many conversions you do.

How accurate are the conversions?

Conversions use exact standard factors (for example 1 inch = 2.54 cm and 1 pound = 0.45359237 kg).

Can I convert Celsius to Fahrenheit?

Yes — pick Temperature, then Celsius to Fahrenheit, or the other way round. Kelvin is supported too.

🔒 Your privacy: this tool runs 100% inside your browser. Your numbers are never uploaded to any server — they stay on your device.

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