Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin and Rankine instantly.

Temperature conversion formulas

°C to °F: (°C × 9/5) + 32
°F to °C: (°F − 32) × 5/9
°C to K: °C + 273.15
K to °C: K − 273.15
°F to K: (°F + 459.67) × 5/9

Common temperature references

Absolute zero: −273.15°C / −459.67°F / 0 K
Water freezes: 0°C / 32°F / 273.15 K
Room temperature: 20–22°C / 68–72°F
Human body: 37°C / 98.6°F
Water boils: 100°C / 212°F / 373.15 K

What is Kelvin?

Kelvin is the SI base unit of temperature used in science. 0 K is absolute zero — the coldest possible temperature, where all molecular motion stops. Unlike Celsius and Fahrenheit, Kelvin has no negative values.

What is Rankine?

Rankine is an absolute temperature scale like Kelvin, but based on Fahrenheit degrees. It is used primarily in engineering in the United States. 0°R = 0 K = absolute zero.