Temperature Converter
Convert between the three most used temperature scales: Celsius, Fahrenheit and Kelvin. Enter a value in any unit and see the equivalent in the others instantly.
Input scale
Equivalents
25 C degrees Celsius equals:
Celsius
Water: 0° / 100°
25°C
Fahrenheit
Water: 32° / 212°
77°F
Kelvin
Water: 273.15 / 373.15
298,15K
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How to use: Temperature
- 1Pick the input scale: Celsius, Fahrenheit or Kelvin.
- 2Type the temperature.
- 3Instantly read its equivalent on the other two scales.
What is it for?
- Understand oven temperatures in recipes from other countries.
- Read a weather forecast when traveling abroad.
- Convert to Kelvin for physics or chemistry exercises.
Celsius, Fahrenheit and Kelvin
Three scales, three origins
Celsius sets 0 °C at the freezing point of water and 100 °C at its boiling point at sea level. Fahrenheit (used mostly in the US) places those points at 32 °F and 212 °F. Kelvin starts at absolute zero, −273.15 °C, so it is never negative.
Formulas
°F = °C × 9/5 + 32; °C = (°F − 32) × 5/9; K = °C + 273.15. A mental shortcut from Celsius to Fahrenheit is to double and add 30: it is approximate but gets you close (20 °C ≈ 70 °F; the exact value is 68 °F).
Useful reference points
Human body: 37 °C ≈ 98.6 °F. Typical oven in a recipe: 180 °C ≈ 350 °F. Same value on both scales: −40, where −40 °C = −40 °F. Temperature differences, however, are not converted by adding 32: a 10 °C increase equals 18 °F.
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Frequently asked questions
What's the formula to convert °C to °F?+
Formula: °F = (°C × 9/5) + 32. If you don't want to remember it, let the tool do it for you.
Is there an absolute zero?+
Yes. 0 Kelvin (−273.15 °C) is absolute zero, the lowest possible temperature according to physics.