The Temperature Converter converts between the three main temperature scales — Celsius, Fahrenheit, and Kelvin. Enter a temperature, choose the scales, and the converted value appears instantly, along with the value on all three scales.
It is useful for weather, cooking, science, and travel between countries that use different scales. Everything is calculated in your browser.
How to convert temperature
- Enter the temperature value.
- Choose the scale you are converting from and the scale you are converting to.
- Read the result instantly, or press Swap to reverse the direction.
- See the value on all three scales in the table below.
Temperature conversion 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
Handy reference points
- Water freezes at 0 °C = 32 °F = 273.15 K
- Water boils at 100 °C = 212 °F = 373.15 K
- Normal body temperature is about 37 °C = 98.6 °F
- Room temperature is roughly 20–22 °C = 68–72 °F
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 (1.8) and add 32. For example, 25 °C = (25 × 1.8) + 32 = 77 °F. The converter does this instantly.
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value and multiply by 5/9. For example, 98.6 °F = (98.6 − 32) × 5/9 = 37 °C.
What is Kelvin used for?
Kelvin is the scientific (SI) temperature scale, starting at absolute zero. To convert from Celsius, add 273.15; to go back, subtract 273.15.
What is normal body temperature in Celsius and Fahrenheit?
Normal human body temperature is about 37 °C, which is 98.6 °F.