Type a value, choose the units and get an instant answer. The table below the converter shows the same value in every temperature unit, and all factors use exact or internationally standard definitions.
How to convert temperature units
- Enter the value.
- Pick the unit to convert from and to (⇄ swaps them).
- Read the result, formula and the table of all units.
Temperature units
| Unit | Symbol | About |
|---|---|---|
| Celsius | °C | Water freezes at 0 °C and boils at 100 °C at sea level. Used for weather in most countries. |
| Fahrenheit | °F | Water freezes at 32 °F and boils at 212 °F. Used for weather in the US. |
| Kelvin | K | The SI unit of temperature. 0 K is absolute zero (−273.15 °C). |
| Rankine | °R | An absolute scale using Fahrenheit-sized degrees, used in some US engineering. |
Key temperatures
| °C | °F | K | |
|---|---|---|---|
| Absolute zero | −273.15 | −459.67 | 0 |
| Water freezes | 0 | 32 | 273.15 |
| Room temperature | 20–22 | 68–72 | 293–295 |
| Normal body temperature | 37 | 98.6 | 310.15 |
| Water boils (sea level) | 100 | 212 | 373.15 |
Popular temperature conversions
Celsius to Fahrenheit · Fahrenheit to Celsius · Celsius to Kelvin · Kelvin to Celsius · Fahrenheit to Kelvin · Kelvin to Fahrenheit
Frequently asked questions
How accurate is the temperature converter?
It uses exact definitions where they exist and shows up to 10 significant figures, more than enough for everyday, school and engineering use.
Updated October 2026 · Built and tested by Sharjeel Tahir · How our tools are tested