Convert temperature
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°F = °C × 1.8 + 32
All units in this category
- 20°C
- 68°F
- 293.15K
Other common conversions
About the units
- Degrees Celsius (°C) – The degree Celsius is an SI unit with its own name, exactly the same size as the kelvin but with a shifted zero: a temperature in degrees Celsius is the temperature in kelvin minus 273.15. It is a legal unit in the EU and the standard in weather reports, cooking and medicine outside the US. The name was adopted in 1948, replacing “centigrade”. Water freezes at 0 degrees and boils at roughly 100, but the boiling point is no longer exactly 100: the scale is defined through the kelvin.
- Degrees Fahrenheit (°F) – The degree Fahrenheit has no definition of its own in the SI; it is fixed by its relation to Celsius, where degrees Celsius are degrees Fahrenheit minus 32, divided by 1.8. One degree Fahrenheit is therefore exactly five ninths of a kelvin. The scale is in everyday and weather use in the US but is absent from the EU units directive. 0 °F is −17.8 °C and 100 °F is 37.8 °C. The conversion is not a factor but a linear function: a difference of 10 °F is 5.6 °C.
- Kelvin (K) – The kelvin is the SI base unit of temperature, fixed since 2019 by a defined value for the Boltzmann constant, 1.380649 × 10⁻²³ J/K. Its degree is the same size as the Celsius degree, but its zero is absolute: 0 K is −273.15 °C. It is a legal unit in the EU and the standard in physics, chemistry and engineering. Write “273 K”, never “273 °K” or “degrees kelvin”, since the degree sign was dropped in 1967.