Popular temperature conversions
- Degrees Celsius to degrees Fahrenheit°F = °C × 9/5 + 32
- Degrees Celsius to kelvinsK = °C + 273.15
- Degrees Celsius to degrees Rankine°R = (°C + 273.15) × 9/5
- Degrees Celsius to degrees Réaumur°Ré = °C × 4/5
- Degrees Fahrenheit to degrees Celsius°C = (°F − 32) × 5/9
- Degrees Fahrenheit to kelvinsK = (°F − 32) × 5/9 + 273.15
- Degrees Fahrenheit to degrees Rankine°R = °F + 459.67
- Degrees Fahrenheit to degrees Réaumur°Ré = (°F − 32) × 4/9
- Kelvins to degrees Celsius°C = K − 273.15
- Kelvins to degrees Fahrenheit°F = (K − 273.15) × 9/5 + 32
- Kelvins to degrees Rankine°R = K × 9/5
- Kelvins to degrees Réaumur°Ré = (K − 273.15) × 4/5
- Degrees Rankine to degrees Celsius°C = (°R − 491.67) × 5/9
- Degrees Rankine to degrees Fahrenheit°F = °R − 459.67
- Degrees Rankine to kelvinsK = °R × 5/9
- Degrees Rankine to degrees Réaumur°Ré = (°R − 491.67) × 4/9
- Degrees Réaumur to degrees Celsius°C = °Ré × 5/4
- Degrees Réaumur to degrees Fahrenheit°F = °Ré × 9/4 + 32
- Degrees Réaumur to kelvinsK = °Ré × 5/4 + 273.15
- Degrees Réaumur to degrees Rankine°R = °Ré × 9/4 + 491.67
About temperature units
Temperature scales are not simple multiples of each other: Celsius and Fahrenheit have different zero points as well as different degree sizes, so converting needs an offset as well as a factor. Kelvin and Rankine are absolute scales that start at absolute zero. To convert a temperature difference (for example “the oven runs 10 °F hot”) use the temperature interval converter instead.
Temperature unit reference
| Unit | Symbol | Value in K | System |
|---|---|---|---|
| Degree Celsius | °C | 273.15 K at 0 °C; step 1 K | SI |
| Degree Fahrenheit | °F | 255.37222 K at 0 °F; step 0.55555556 K | US customary |
| Kelvin | K | 0 K at 0 K; step 1 K | SI |
| Degree Rankine | °R | 0 K at 0 °R; step 0.55555556 K | US customary |
| Degree Réaumur | °Ré | 273.15 K at 0 °Ré; step 1.25 K | Other |
Frequently asked questions
What is the SI unit of temperature?
This converter uses the kelvin (K) as its reference unit; every other unit is defined relative to it.
How many temperature units can I convert?
5 units are supported here, across SI, US customary, Other systems. Every pair can be converted in both directions.
Does this temperature converter work offline?
Yes. Once the page has loaded, every calculation runs locally in your browser — nothing is sent to a server.