Step by step
- Open the converter on this page and leave Temperature selected as the Category.
- Pick Kelvin (K) in the From or To dropdown list.
- Type your temperature in Celsius, Fahrenheit or Kelvin into the Value box.
- Read the converted value and the exact formula shown right below.
At a glance
| Celsius | Fahrenheit | Kelvin |
|---|---|---|
| −273.15 °C | −459.67 °F | 0 K (absolute zero) |
| 0 °C | 32 °F | 273.15 K (water freezes) |
| 20 °C | 68 °F | 293.15 K (room temp) |
| 100 °C | 212 °F | 373.15 K (water boils) |
Related questions
What is the formula for Celsius to Kelvin?
Add 273.15 to the Celsius value: K = °C + 273.15. To go from Kelvin to Celsius, subtract 273.15.
How do you convert Fahrenheit to Kelvin?
Use K = (°F − 32) × 5/9 + 273.15, or select Fahrenheit and Kelvin in the converter above.
Why does Kelvin not use a degree symbol?
By international standard, Kelvin is an absolute unit written simply as K, unlike °C and °F.
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Updated November 14, 2026.