Temperature converter (Celsius, Fahrenheit, Kelvin)
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- °F = °C × 9/5 + 32; °C = (°F − 32) × 5/9; K = °C + 273.15.
| Inputs | Answer |
|---|---|
| 0, K | 0 K is -273.15 °C and -459.67 °F. |
| 300, K | 300 K is 26.85 °C and 80.33 °F. |
| 25, C | 25 °C is 77 °F and 298.15 K. |
| 72, F | 72 °F is 22.22 °C and 295.37 K. |
How to use it
The three scales are linked by simple formulas: °F = °C × 9/5 + 32, °C = (°F − 32) × 5/9 and K = °C + 273.15. Kelvin starts at absolute zero (0 K = −273.15 °C), so it has no negative values.
The calculator rejects temperatures below absolute zero, since they cannot exist.
Frequently asked questions
What is 0 K in Celsius?
−273.15 °C, absolute zero.
How do I convert Kelvin to Celsius?
Subtract 273.15.
Why does Kelvin have no degree sign?
Kelvin is an absolute scale and is written without a degree sign: K.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
Written by Calculators Free Editorial Team · Data checked 2026-11-12
About · How we verify this · Editorial policy · Corrections
About · How we verify this · Editorial policy · Corrections
General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.