Unit Converter
Convert between metric and imperial units across length, weight, temperature, volume and more.
Common Conversions
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About Unit Conversion
Unit conversion is the process of expressing the same quantity in a different unit of measurement. The metric system (SI) uses base-10 prefixes — kilo (×1000), centi (÷100), milli (÷1000) — making conversions straightforward. Imperial units (inches, feet, miles, pounds, gallons) have less consistent relationships and require fixed conversion factors.
Temperature is the only common unit with a non-multiplicative conversion: Celsius to Fahrenheit requires both multiplication and addition (°C × 9/5 + 32). All other conversions in this tool are simple multiplication by a fixed factor. Everything runs locally in your browser — no data is sent anywhere.
How to Use
- Select a category (Length, Weight, Temperature, etc.) from the tabs.
- Choose the unit to convert from and the unit to convert to.
- Enter a value — the result updates instantly.
- Click ⇄ to swap the two units.
Frequently Asked Questions
The formula is °F = (°C × 9/5) + 32. For example, 100°C = (100 × 1.8) + 32 = 212°F. To go the other way: °C = (°F − 32) × 5/9. A useful mental shortcut: double the Celsius value and add 30 for a rough Fahrenheit estimate (20°C → ~70°F).
1 mile = 1.60934 kilometres. A quick approximation is to multiply miles by 1.6 — it's accurate to within 0.4%. Going the other way, 1 km ≈ 0.621 miles. If you're converting a long distance like 100 miles, that's approximately 161 km.
No. All conversions happen entirely in your browser. Nothing is sent to any server.