Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine quickly and accurately for everyday use, science, cooking, weather, and engineering.
Convert temperature units
Enter a value, choose the unit to convert from, then choose the unit to convert to.
Common temperature reference points
0°C = 32°F = 273.15 K
100°C = 212°F = 373.15 K
Room temperature is about 20°C to 22°C
Freezing point of water: 0°C
Boiling point of water: 100°C
Absolute zero: -273.15°C = 0 K
How this converter works
Temperature conversion is different from other unit conversions because it uses both scaling and offsets. This converter first changes the input into Celsius, then converts that Celsius value into the selected output unit.
- Celsius and Fahrenheit are commonly used for weather and everyday temperatures.
- Kelvin is widely used in science and engineering.
- Rankine is mainly used in some engineering fields.
FAQs
How do you convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and then add 32.
How do you convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value and multiply the result by 5/9.
Can Kelvin be negative?
No. Kelvin starts at absolute zero, so values below 0 K are not physically valid.