Temperature converter
Enter a temperature in any unit — Celsius, Fahrenheit, Kelvin, or Rankine — and see the equivalent in all others instantly.
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Conversion formulas
| From | To | Formula |
|---|---|---|
| Celsius | Fahrenheit | °F = °C × 9/5 + 32 |
| Fahrenheit | Celsius | °C = (°F − 32) × 5/9 |
| Celsius | Kelvin | K = °C + 273.15 |
| Kelvin | Celsius | °C = K − 273.15 |
| Celsius | Rankine | °R = (°C + 273.15) × 9/5 |
| Fahrenheit | Rankine | °R = °F + 459.67 |
Reference points
| Point | °C | °F | K | °R |
|---|---|---|---|---|
| Absolute zero | −273.15 | −459.67 | 0 | 0 |
| Water freezes | 0 | 32 | 273.15 | 491.67 |
| Body temperature | 37 | 98.6 | 310.15 | 558.27 |
| Water boils | 100 | 212 | 373.15 | 671.67 |
References
- SI Units — Temperature (kelvin, Celsius, conversions)National Institute of Standards and Technology · nist.gov
- Fahrenheit — scale and Celsius conversion formulasWikipedia · en.wikipedia.org
- Kelvin — SI base unit of temperatureWikipedia · en.wikipedia.org
Frequently asked
How do you convert Celsius to Fahrenheit?
°F = (°C × 9/5) + 32. So 100°C = 212°F and 0°C = 32°F.
How do you convert Fahrenheit to Celsius?
°C = (°F − 32) × 5/9. So 98.6°F = 37°C.
What is Kelvin?
Kelvin is the SI base unit of temperature. It starts at absolute zero (0 K = −273.15°C) and uses the same degree size as Celsius. Water freezes at 273.15 K and boils at 373.15 K.
What is Rankine?
Rankine is an absolute temperature scale like Kelvin but based on Fahrenheit degrees. 0°R = absolute zero. Water freezes at 491.67°R and boils at 671.67°R.
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