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Updated October 9, 2026
Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin instantly. The formulas are shown below so you can check the math yourself.
The formulas
- Celsius to Fahrenheit: °F = °C × 9/5 + 32
- Fahrenheit to Celsius: °C = (°F − 32) × 5/9
- Celsius to Kelvin: K = °C + 273.15
- Kelvin to Celsius: °C = K − 273.15
Temperature is the one converter that is not a simple multiplication: the scales have different zero points, so each conversion is a multiply plus an offset. The tool converts through Celsius internally.
Worked example
Convert 72 °F to Celsius: (72 − 32) × 5/9 = 40 × 5/9 = 22.2 °C. To Kelvin: 22.2 + 273.15 = 295.35 K.
Absolute zero
0 K (−273.15 °C, −459.67 °F) is the coldest temperature physically possible. Kelvin has no negative values and no degree symbol: it is 300 K, not 300° K.
Planning estimate only. Results use the list prices shown and may differ from your actual bill. Terms
Frequently asked questions
How do you convert Fahrenheit to Celsius?
(°F − 32) × 5/9. So 98.6 °F is 37 °C, and 32 °F is 0 °C.
How do you convert Celsius to Kelvin?
Add 273.15. Water freezes at 273.15 K and boils at 373.15 K.
At what temperature are Celsius and Fahrenheit equal?
−40. It is the one temperature where both scales agree, which makes a handy sanity check.
What is absolute zero?
−273.15 °C or 0 K, the coldest temperature possible. The converter accepts values below it mathematically, but they have no physical meaning.