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Temperature Converter
Convert Celsius, Fahrenheit, Kelvin and Rankine for weather, cooking, science and engineering.
°C · °F · K · °R
Temperature conversion formulas
| Conversion | Formula |
|---|---|
| Celsius to Fahrenheit | °F = °C × 9/5 + 32 |
| Fahrenheit to Celsius | °C = (°F - 32) × 5/9 |
| Celsius to Kelvin | K = °C + 273.15 |
| Kelvin to Celsius | °C = K - 273.15 |
| Fahrenheit to Rankine | °R = °F + 459.67 |
| Rankine to Fahrenheit | °F = °R - 459.67 |
Common temperature reference
| Reference point | °C | °F | K |
|---|---|---|---|
| Absolute zero | -273.15 | -459.67 | 0 |
| Water freezes | 0 | 32 | 273.15 |
| Room temperature | 20 | 68 | 293.15 |
| Human body temperature | 37 | 98.6 | 310.15 |
| Water boils | 100 | 212 | 373.15 |
Temperature converter FAQ
What is the difference between Kelvin and Celsius?
They use the same interval, but Kelvin starts at absolute zero: K = °C + 273.15.
Why are water points 32°F and 212°F?
Those are the freezing and boiling points at standard atmospheric pressure.
Can Kelvin be negative?
Physical temperatures cannot be below 0 K; mathematical conversions are still shown.
What is Rankine?
Rankine is an absolute scale using Fahrenheit-sized degrees.