6 tools
Convert Celsius, Fahrenheit and Kelvin with the right offset as well as scale.
Choose a conversion below. Every tool includes an instant result, an example and a short explanation.
Temperature scales need an offset as well as a size ratio. Water freezes at 0 °C or 32 °F under ordinary reference conditions; the corresponding thermodynamic temperature is 273.15 K. A change of 1 K is the same size as a change of 1 °C, but the scale origins differ.
Use these tools for weather, ovens, laboratories and engineering. Negative Celsius and Fahrenheit readings are valid, but Kelvin cannot fall below zero for a thermodynamic temperature. A boiling point depends on pressure, so familiar 100 °C or 212 °F is a reference near standard atmospheric pressure rather than a universal value for every location.
Celsius and Fahrenheit have different zero points as well as different-sized degrees. Therefore a temperature reading needs both scaling and an offset. A temperature difference is a separate concept: a rise of one degree Celsius equals a rise of 1.8 degrees Fahrenheit, even though 1 °C itself is 33.8 °F.
A thermodynamic temperature expressed in kelvins cannot be below zero. Celsius and Fahrenheit readings may be negative because their scale origins are elsewhere. If a calculation gives a negative Kelvin result, inspect the input and whether you meant an absolute temperature or a temperature difference before using it.