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Convert Celsius, Fahrenheit and Kelvin instantly with formulas.
The temperature converter translates between Celsius, Fahrenheit, and Kelvin and shows the formula behind each result. It is useful for recipes, science homework, engineering specs, and weather reports written in another scale.
Conversion happens in your browser as you type. There is no need to send your numbers anywhere, and the tool works without a network connection once loaded.
Boiling point of water
Input
100 °COutput
212 °F, 373.15 KFahrenheit is 100 times 9/5 plus 32, and Kelvin is Celsius plus 273.15.
The point where the scales meet
Input
-40 °FOutput
-40 °C, 233.15 K-40 is the only temperature that reads the same in both Celsius and Fahrenheit.
Kelvin to everyday units
Input
300 KOutput
26.85 °C, 80.33 °FSubtract 273.15 for Celsius, then apply the Fahrenheit formula.
Fahrenheit equals Celsius times 9/5 plus 32, Celsius equals Fahrenheit minus 32 times 5/9, and Kelvin equals Celsius plus 273.15.
No. Zero Kelvin is absolute zero, the coldest possible temperature, so any negative Kelvin value is invalid.
Results are rounded for display while the calculation uses full precision. Rounding to two decimals accounts for any last-digit difference.
No. Values are converted in your browser and nothing is transmitted.
Each scale derived from Celsius.
°F = (°C × 9/5) + 32
°C = (°F − 32) × 5/9
K = °C + 273.15