How to Convert Celsius to Fahrenheit
Whether you're travelling to the US, following a recipe, or just checking the weather, knowing how to convert between Celsius and Fahrenheit is a life skill. Here's everything you need.
The Formula
ยฐF = (ยฐC ร 9/5) + 32
Or equivalently: ยฐF = (ยฐC ร 1.8) + 32
Quick Mental Math Trick
Don't have a calculator? Use this shortcut that gets you within 1-2 degrees:
- Double the Celsius number
- Subtract 10% of that result
- Add 32
Example: 25ยฐC โ 25ร2 = 50 โ 50โ5 = 45 โ 45+32 = 77ยฐF โ
Going the Other Way: Fahrenheit to Celsius
ยฐC = (ยฐF โ 32) ร 5/9
Example: 98.6ยฐF โ (98.6โ32) ร 5/9 = 66.6 ร 0.556 = 37ยฐC (body temperature)
Common Temperatures Reference
| Description | ยฐC | ยฐF |
|---|---|---|
| Water freezes | 0 | 32 |
| Cool room | 18 | 64 |
| Comfortable room | 22 | 72 |
| Hot day | 35 | 95 |
| Body temperature | 37 | 98.6 |
| Fever | 39 | 102 |
| Water boils | 100 | 212 |
| Oven (moderate) | 180 | 356 |
Why Two Systems?
Celsius (also called Centigrade) is based on water: 0ยฐ = freezing, 100ยฐ = boiling. It's used by every country except the US, Liberia, and Myanmar.
Fahrenheit was created earlier (1724) by Daniel Fahrenheit. In his scale, 0ยฐ was the coldest temperature he could create in a lab, and 96ยฐ was body temperature (later refined to 98.6ยฐ).
When Does It Matter?
- โถ Cooking: US recipes use ยฐF, European ones use ยฐC
- โถ Weather: "It's 100ยฐF" sounds extreme to a European (it's 38ยฐC)
- โถ Medicine: A fever is 38ยฐC / 100.4ยฐF โ know both
- โถ Science: Always Celsius (or Kelvin)
Try It Now
Use our Temperature Converter for instant, accurate conversions between Celsius, Fahrenheit, and Kelvin.
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