🌡️ Temperature Converter
Quick answer
The conversions are: °F = (°C × 9/5) + 32, °C = (°F − 32) × 5/9, and K = °C + 273.15. Kelvin starts at absolute zero (−273.15°C), the coldest temperature physically possible, so Kelvin values are never negative. At −40, the Celsius and Fahrenheit scales read exactly the same number.
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How to use the Temperature Converter
- Type a value in any one of the three fields — Celsius, Fahrenheit or Kelvin.
- The other two fields update instantly as you type.
- Or tap a reference chip — freezing, room, body temperature, boiling or the −40 crossover — to load it.
- Read the summary line for the full conversion at a glance.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 (or 1.8) and add 32. Example: 37°C × 1.8 + 32 = 98.6°F, which is normal human body temperature.
At what temperature are Celsius and Fahrenheit equal?
At −40 degrees. −40°C is exactly −40°F; it is the only point where the two scales agree, and it occurs in the coldest inhabited places on Earth in winter.
Why does Kelvin have no degree symbol and no negatives?
Kelvin is an absolute scale starting at absolute zero (0 K = −273.15°C), where molecular motion is at its minimum. Because it starts at zero and only counts up, values are written as "273.15 K" without a degree sign.