Convert between Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Delisle, Newton & Rømer
SI standard — used in most countries worldwide
Select scales above and enter a temperature value to see the result
Select your source temperature scale, enter a value, and choose the target scale — results appear instantly. Use the ⇅ Swap button to reverse the conversion. Click "Quick Presets" for common reference temperatures, or visit the "Reference Points" tab for a full table of well-known temperatures across all scales.
Celsius (°C) is the international standard used in science and daily life in most countries. Water freezes at 0°C and boils at 100°C. Fahrenheit (°F) is used primarily in the United States: water freezes at 32°F and boils at 212°F. Kelvin (K) is the SI thermodynamic unit — it has no negative values and starts at absolute zero (−273.15°C = 0 K), making it ideal for scientific calculations.