Temperature Converter
Convert Celsius, Fahrenheit and Kelvin with the formulas shown.
The three scales
Celsius is used in most of the world and sets water’s freezing and boiling points at 0 and 100 degrees. Fahrenheit is common in the United States. Kelvin starts at absolute zero and is used in science.
Formulas
- °F = °C × 9/5 + 32
- °C = (°F − 32) × 5/9
- K = °C + 273.15
Example
25 °C × 9/5 + 32 = 77 °F. Body temperature of 37 °C is 98.6 °F, and water boils at 212 °F.
Frequently asked questions
At what temperature are Celsius and Fahrenheit equal?
At −40 degrees, both scales show the same number.
Why does Kelvin have no degree sign?
Kelvin is an absolute scale, so its unit is written simply as K, for example 298.15 K.
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