Convert a temperature between Celsius, Fahrenheit, and Kelvin instantly.
Temperature Converter
LiveEdit any field - the other two update automatically.
The formulas
F = C x 9/5 + 32
K = C + 273.15
C = (F - 32) x 5/9
Example
20°C converts to 68°F and 293.15 K.
Step-by-step guide
- Enter a temperature in any one of the three fields.
- The other two update automatically.
Common mistakes
Forgetting Fahrenheit and Celsius have different zero points - simply scaling by 9/5 without adding 32 gives a wrong result.
Using negative Kelvin values - Kelvin has an absolute zero and never goes below 0, unlike Celsius and Fahrenheit.
Frequently asked questions
Why does Kelvin not use a degree symbol?
Kelvin is an absolute temperature scale used in science, conventionally written without the degree symbol (293.15 K, not 293.15°K).
At what temperature are Celsius and Fahrenheit equal?
At -40 degrees, both scales read the same value: -40°C equals -40°F.
What is absolute zero?
Absolute zero (0 K) is -273.15°C or -459.67°F - the theoretical point at which particles have minimal thermal motion.
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