Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin instantly.
Result
Celsius (°C)
25.00
Fahrenheit (°F)
77.00
Kelvin (K)
298.15
How it works
Three scales dominate temperature. Celsius pins 0 to freezing water and 100 to boiling water. Fahrenheit, used in the US, puts those same events at 32 and 212. Kelvin starts at absolute zero — the coldest possible temperature — and climbs in Celsius-sized steps: K = °C + 273.15. The Celsius–Fahrenheit conversion is °F = °C × 9/5 + 32, and back °C = (°F − 32) × 5/9. The offset of 32 is what trips people up — the two scales even cross at −40°, the one temperature that reads the same in both. Quick anchors help sanity-check any conversion: 0 °C = 32 °F (freezing), 20 °C = 68 °F (room), 37 °C = 98.6 °F (body), 100 °C = 212 °F (boiling). Kelvin has no degree sign and never goes negative — it is the scale of physics.
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Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example, 20°C × 9/5 + 32 = 68°F.
How do I convert Fahrenheit to Celsius?
Subtract 32, then multiply by 5/9. For example, (68°F − 32) × 5/9 = 20°C.
Why is −40 special?
It is the point where the Celsius and Fahrenheit scales meet: −40 °C = −40 °F. Solve °F = °C at 9/5·x + 32 = x and you get x = −40.
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