Popular temperature conversions
Temperature units
Temperature scales do not share a zero, so converting between them needs an offset as well as a factor. Water freezes at 0 °C, 32 °F and 273.15 K. A change of one degree Celsius equals a change of one kelvin and 1.8 degrees Fahrenheit.
| Unit | Symbol | Scale | Definition |
|---|---|---|---|
| Degree Celsius | °C | — | Water freezes at 0 °C and boils at 100 °C at sea level. A step of one degree equals one kelvin. |
| Degree Fahrenheit | °F | — | Water freezes at 32 °F and boils at 212 °F at sea level. Used for everyday temperatures in the US. |
| Kelvin | K | — | The SI base unit of temperature. Zero kelvin is absolute zero; the step size matches the Celsius degree. |
| Degree Rankine | °R | — | An absolute scale with Fahrenheit-sized degrees, used in some US engineering work. |
Calculate with temperature
The smart calculator does arithmetic across temperature units and picks a sensible unit for the answer. Try 98.6 °F to °C.
Questions and answers
Which temperature units can I convert?
All 4: degrees Celsius, degrees Fahrenheit, kelvins, degrees Rankine.
What is the SI unit of temperature?
Temperature scales do not share a zero, so converting between them needs an offset as well as a factor. Water freezes at 0 °C, 32 °F and 273.15 K. A change of one degree Celsius equals a change of one kelvin and 1.8 degrees Fahrenheit.
At what temperature are Celsius and Fahrenheit equal?
At −40. −40 °C and −40 °F are the same temperature.
How precise are the results?
Factors are the exact legal definitions where one exists (an inch is exactly 2.54 cm, a pound exactly 0.45359237 kg). Results show 10 significant digits by default; the precision menu offers 4 to 15.
Does the temperature converter work offline?
Yes. ConvertEasy is a progressive web app: after your first visit it keeps working with no connection, and you can install it to your home screen from the browser menu.