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Converts one temperature into Celsius, Fahrenheit, Kelvin, Rankine and Reaumur simultaneously.
Converts one temperature into Celsius, Fahrenheit, Kelvin, Rankine and Reaumur simultaneously. Choose the scale you are starting from, type a number, and all five results appear together with a reference table of familiar points such as absolute zero and the boiling point of water.
72 °F
22.22 °C, 295.37 K, 531.67 °R, 17.78 °Ré
Good to know. Water freezing and boiling points assume a pressure of 1 atmosphere. Negative-zero results are shown as plain 0.
Enter a temperature
All five scales
Reference points
| Reference | °C | °F | K | °R | °Ré |
|---|---|---|---|---|---|
| Absolute zeroThe thermodynamic floor — no substance can be colder. | -273.15 | -459.67 | 0 | 0 | -218.52 |
| Dry ice sublimationSolid CO₂ turns straight to gas at 1 atm. | -78.5 | -109.3 | 194.65 | 350.37 | -62.8 |
| Celsius / Fahrenheit crossoverThe single point where °C and °F read the same number. | -40 | -40 | 233.15 | 419.67 | -32 |
| Water freezing pointIce point of pure water at 1 atm. | 0 | 32 | 273.15 | 491.67 | 0 |
| Room temperatureCommon laboratory ambient reference. | 20 | 68 | 293.15 | 527.67 | 16 |
| Human body temperatureStandard normal core body temperature. | 37 | 98.6 | 310.15 | 558.27 | 29.6 |
| Water boiling pointSteam point of pure water at 1 atm. | 100 | 212 | 373.15 | 671.67 | 80 |
| Surface of the SunEffective photosphere temperature. | 5504.85 | 9940.73 | 5778 | 10400.4 | 4403.88 |
Definitions: 0 °C ≡ 273.15 K exactly · °F = °C × 9/5 + 32 · °R = K × 9/5 = °F + 459.67 · °Ré = °C × 4/5. All conversions route through Kelvin, so every scale pair stays consistent. Water freezing and boiling points are quoted at 1 atm.