Temperature Converter
Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine. See all conversions at once and understand the formulas.
Convert Temperature
Reference Temperatures
| Reference | °C | °F | K |
|---|---|---|---|
| Absolute zero | -273.15 | -459.67 | 0 |
| Dry ice | -78.5 | -109.3 | 194.65 |
| Water freezes | 0 | 32 | 273.15 |
| Cold day | -10 | 14 | 263.15 |
| Room temperature | 20 | 68 | 293.15 |
| Body temperature | 37 | 98.6 | 310.15 |
| Hot summer day | 40 | 104 | 313.15 |
| Water boils | 100 | 212 | 373.15 |
| Oven (baking) | 180 | 356 | 453.15 |
| Surface of the Sun | 5,500 | 9,932 | 5,773.15 |
How to Use Temperature Converter
- 1Enter a temperature value in any unit.
- 2All other units update instantly.
- 3Copy any converted value.
- 4View the formula used for each conversion.
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Frequently Asked Questions
What is the formula to convert Celsius to Fahrenheit?▾
F = (C × 9/5) + 32. Common values: 0°C = 32°F (freezing point), 100°C = 212°F (boiling point), 37°C = 98.6°F (body temperature), 20°C = 68°F (room temperature). To convert Fahrenheit to Celsius: C = (F − 32) × 5/9.
What is the Kelvin scale?▾
Kelvin is the SI base unit of thermodynamic temperature. It starts at absolute zero — the coldest possible temperature (0 K = −273.15°C = −459.67°F). Unlike Celsius and Fahrenheit, Kelvin has no degree symbol. Converting: K = °C + 273.15. Kelvin is used in physics, chemistry, and astronomy. Absolute zero is theoretically unreachable but has been approached within billionths of a degree.
What is Rankine temperature?▾
Rankine is an absolute temperature scale based on Fahrenheit rather than Celsius. 0 Rankine = absolute zero, like Kelvin. 1 Rankine = 1 Fahrenheit degree. R = °F + 459.67. Rankine = K × 9/5. It is used in some engineering applications in the United States. Water freezes at 491.67 R and boils at 671.67 R.
Why do the US and UK use different temperature scales?▾
The United States uses the Fahrenheit scale (developed by Daniel Gabriel Fahrenheit in 1724), while most other countries use Celsius (Anders Celsius, 1742) which was standardized by the metric system. The UK officially uses Celsius but weather forecasts often include Fahrenheit for older audiences. The scientific and medical communities worldwide use Celsius and Kelvin.
What temperature is the same in Celsius and Fahrenheit?▾
−40° is the same in both Celsius and Fahrenheit: −40°C = −40°F. This can be derived by solving C = F in the conversion formula: F = (C × 9/5) + 32 → C = (C × 9/5) + 32 → C − 9C/5 = 32 → −4C/5 = 32 → C = −40. At this temperature, the two scales agree, which is useful to remember.