Convert between metric and imperial units of length, weight, temperature and volume. Pick the input and output units, type a value and read the answer.
Intuitive, friction-free workflow designed to get you from blank slate to job-ready in minutes.
Choose the measurement category.
Pick the 'from' and 'to' units.
Type a value, the answer updates instantly.
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US recipes use cups and Fahrenheit. European engineering uses metres and Celsius. Global e-commerce shows product dimensions in both systems. A wrong unit conversion destroyed a Mars orbiter in 1999, unit mistakes are not just inconvenient, they are expensive.
Keep significant figures reasonable. Converting 1 metre to feet gives 3.28084 feet, but reporting six decimal places implies false precision. Round to what your use case actually needs.
Straightforward answers regarding ATS compliance, PDF rendering, and data privacy.
Yes, Celsius, Fahrenheit and Kelvin are all supported. Note Kelvin starts at absolute zero (−273.15°C), so negative Kelvin inputs are rejected.
US, metric and Imperial (UK) cups are all different sizes. The converter exposes each variant, pick the one your recipe uses.
All conversions use the official BIPM factors and are accurate to 15 decimal places. We display the first 6 by default for readability.
Not directly, that depends on the density of the substance. Use a recipe-specific tool for ingredient conversions.
Choose the Length category, set the value and pick cm as the source and in as the target (or vice versa). The conversion updates instantly using the exact 2.54 cm per inch factor.
Pick the Weight category for kg↔lbs or the Temperature category for °C↔°F. Enter your value and the converter returns an accurate result immediately, no formula memorising needed.
In-depth articles and tutorials to get the most out of Unit Converter.
Convert temperatures between Celsius and Fahrenheit accurately. Learn the 9/5 formula, fast mental math estimation tricks, and key thermodynamic benchmarks.
A practical guide to unit conversions across length, weight, volume, and temperature. Learn exact mathematical constants, quick mental math formulas, and why the world uses two systems.