How to use this calculator
- Enter a temperature (negative values are allowed).
- Choose the scale you have and the scale you want.
Formula
Temperature scales differ in both size of degree and zero point, so conversion uses an offset as well as a factor.
°F = °C × 9/5 + 32
°C = (°F − 32) × 5/9
K = °C + 273.15
°R = °F + 459.67
Examples
- 100 °F → (100 − 32) × 5/9 = 37.78 °C.
- 20 °C → 20 × 1.8 + 32 = 68 °F.
- −40 °C = −40 °F, where the scales meet.
Frequently asked questions
What is normal body temperature?
About 37 °C (98.6 °F), though healthy values range roughly from 36.1 to 37.2 °C.
What is absolute zero?
0 K = −273.15 °C = −459.67 °F, the lowest possible temperature.
Why does Kelvin have no degree sign?
Kelvin is an absolute SI unit, so it's written simply as K.