Celsius to Fahrenheit
Convert temperatures from Celsius to Fahrenheit. Includes conversion formula and common reference temperatures.
About the Celsius to Fahrenheit
To convert Celsius to Fahrenheit, multiply by 9, divide by 5 and add 32; as a formula, F equals C times 1.8 plus 32. The offset of 32 exists because Fahrenheit places the freezing point of water at 32 degrees while Celsius places it at zero. Water boils at 100 degrees Celsius, which is 212 degrees Fahrenheit.
The two scales agree at minus 40, where both read the same number. A handy weather approximation is to double the Celsius value and add 30: 20 degrees Celsius becomes about 70 Fahrenheit, close to the exact 68.
0 C is 32 F, 20 C is 68 F, 25 C is 77 F, 37 C (normal body temperature) is 98.6 F, 40 C is 104 F and 180 C (a typical oven setting) is 356 F.
Tips for best results
- Do the multiplication before adding 32, or the answer will be wrong.
- To go back, subtract 32, then multiply by 5 and divide by 9.
How to use the Celsius to Fahrenheit
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Frequently Asked Questions
Is Celsius to Fahrenheit free to use?
Yes — Celsius to Fahrenheit is completely free, unlimited, and requires no sign-up.
What temperature is the same in Celsius and Fahrenheit?
-40°C equals -40°F — the two scales intersect at this point.
How accurate is the conversion?
It uses the standard, internationally recognized conversion factor, so results are precise.
Does it work on mobile and tablet?
Yes — Celsius to Fahrenheit works on any modern browser, including mobile and tablet, no app required.