Formula
°F = °C × 9/5 + 32°C = (°F − 32) × 5/9K = °C + 273.15°R = (°C + 273.15) × 9/5
- Absolute zero is 0 K = −273.15 °C = −459.67 °F.
Scale the size of the degree, then shift the zero point.
Worked example
100 °C in °F
- Value
- 100
- From
- Celsius (°C)
- To
- Fahrenheit (°F)
Celsius to Fahrenheit
212°F
In words: 100 °C = 212 °F
How it works
Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at standard pressure. A Celsius degree is 1.8 times the size of a Fahrenheit degree, hence the ×9/5, and the scales are offset by 32 — which is why −40 is the one temperature where both agree.
Kelvin uses the same size of degree as Celsius but starts at absolute zero, so it never goes negative; the tool rejects anything below it. Kelvin is written without a degree sign. Rankine does the same for Fahrenheit-sized degrees. For other measurements try the Unit Converter or Fuel Economy Converter.
Assumptions and limits
- Results are shown to up to 10 significant digits.
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