From
To
Select a value to see the formula.
—
—
All conversions
Everything you need to know about unit conversion — fast.
Covers everyday and specialist conversions: length, weight, temperature, speed, volume, area, pressure, energy, power, fuel economy, cooking measurements, time, frequency, angle, data storage, and number bases.
Results update as you type — no button to press. The multi-unit panel shows every unit in the selected category simultaneously so you can compare values at a glance.
Click any row in the results panel to copy that value straight to your clipboard. A confirmation tick confirms the copy. Works on desktop and mobile.
Every conversion is calculated through a shared base unit for each category. All length values convert through metres, and all weight values through kilograms. This ensures accuracy across any combination of units without a separate formula for every pair. Temperature is handled specially since Celsius, Fahrenheit, and Kelvin use offset formulas rather than simple multiplication.
Manual unit conversion is error-prone, especially across measurement systems or with unfamiliar units like Pascals or dBm. An instant converter eliminates rounding mistakes and removes the need to remember conversion factors. Whether you're cooking, travelling, studying, or working in engineering, having a reliable reference saves time and prevents costly errors.
Unlike most units, temperature scales don't share a common zero point, so you can't simply multiply. To convert Celsius to Fahrenheit: multiply by 9/5 then add 32. To convert to Kelvin: add 273.15. Kelvin is the SI base unit used in science because it starts at absolute zero — the point at which all molecular motion stops.
The metric system (SI) is used by most of the world and is based on powers of ten, making conversions straightforward. The imperial system — still common in the US and UK for everyday use — uses arbitrary factors (12 inches in a foot, 16 ounces in a pound). This converter handles both seamlessly, including hybrid units like miles-per-gallon alongside litres-per-100km.