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Convert temperatures between the Celsius, Fahrenheit and Kelvin scales, with useful reference values and conversion formulas.
Use a point or comma for decimals.
Temperature
Temperature scales have different zero points. Converting therefore needs more than a single multiplication factor: Celsius and Fahrenheit use an offset of 32 degrees, while Celsius and kelvin use an offset of 273.15.
°F = °C × 9/5 + 32 °C = (°F − 32) × 5/9 K = °C + 273.15
| Celsius (°C) | Fahrenheit (°F) | Kelvin (K) |
|---|---|---|
| −273.15 °C | −459.67 °F | 0 K |
| −40 °C | −40 °F | 233.15 K |
| 0 °C | 32 °F | 273.15 K |
| 20 °C | 68 °F | 293.15 K |
| 100 °C | 212 °F | 373.15 K |
This tool converts a temperature reading. A change of 10 °C corresponds to a change of 18 °F, without adding 32. The kelvin symbol is K, with no degree sign. For ordinary physical temperatures, the lower limit is 0 K, or −273.15 °C.
For 77 °F, subtract 32 and multiply by 5/9: (77 − 32) × 5/9 = 25 °C. The same temperature is 298.15 K.
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