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Convert between Celsius, Fahrenheit and Kelvin
Enter a temperature in any scale and read all three. Temperature is the one conversion that needs an offset as well as a factor, which is why it does not fit the generic unit converter.
- Celsius
- 20 °C
- Fahrenheit
- 68 °F
- Kelvin
- 293.15 K
How to use it
- 1Type a temperature.
- 2Say which scale it is in.
- 3Read the other two — all three are shown at once.
Frequently asked questions
- Why is temperature not in the unit converter?
- Because it needs an offset as well as a factor. Length and weight are pure ratios — double the metres, double the feet — but 0°C is not zero heat, so the conversion is a multiply plus a shift. Mixing those into one generic converter is how tools end up saying 0°C = 0°F.
- What is the formula?
- °F = °C × 9/5 + 32, and °C = (°F − 32) × 5/9. Kelvin is Celsius plus 273.15, no factor at all, because it uses the same degree size measured from absolute zero.
- Where do the two scales cross?
- At −40, which is the same temperature in Celsius and Fahrenheit. It is the one value you never have to convert.
- What is a normal body temperature?
- About 37°C or 98.6°F, though the average sits slightly below that and healthy readings vary through the day by half a degree. A fever is usually defined from 38°C, or 100.4°F.