Temperature Converter
Enter a temperature and choose your source and target scale to convert instantly between Celsius, Fahrenheit, and Kelvin.
Converted value
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How the Temperature Converter formula works
Conversions between the three common scales:
°F = °C × 9/5 + 32 °C = (°F − 32) × 5/9 K = °C + 273.15
Step-by-step calculation
- If converting from Fahrenheit, first convert to Celsius using (°F − 32) × 5/9.
- If converting from Kelvin, first convert to Celsius by subtracting 273.15.
- From Celsius, convert to the target scale using its specific formula.
Worked example
Converting 98.6°F (normal human body temperature) to Celsius: (98.6 − 32) × 5/9 = 66.6 × 5/9 = 37°C. Converting that to Kelvin: 37 + 273.15 = 310.15 K.
Frequently asked questions
Why does Kelvin not use the degree symbol?
Kelvin is an absolute temperature scale where zero represents absolute zero, so by SI convention it's written as '310 K', not '310°K' — unlike Celsius and Fahrenheit, which are relative scales.
What temperature is the same in Celsius and Fahrenheit?
−40°, since that's the point where the two linear scales cross: −40°C = −40°F.