F to C
Fahrenheit to Celsius: °C = (°F − 32) × 5/9. Type a number and read the answer straight off the scale.
F to C chart of common values
| Degrees Fahrenheit | Degrees Celsius |
|---|---|
| -40 °F | -40 °C |
| -20 °F | -28.9 °C |
| 0 °F | -17.8 °C |
| 10 °F | -12.2 °C |
| 20 °F | -6.7 °C |
| 32 °F | 0 °C |
| 40 °F | 4.4 °C |
| 50 °F | 10 °C |
| 60 °F | 15.6 °C |
| 65 °F | 18.3 °C |
| 68 °F | 20 °C |
| 70 °F | 21.1 °C |
| 72 °F | 22.2 °C |
| 75 °F | 23.9 °C |
| 80 °F | 26.7 °C |
| 85 °F | 29.4 °C |
| 90 °F | 32.2 °C |
| 95 °F | 35 °C |
| 98.6 °F | 37 °C |
| 100 °F | 37.8 °C |
| 104.5 °F | 40.3 °C |
| 212 °F | 100 °C |
| 350 °F | 176.7 °C |
| 400 °F | 204.4 °C |
| 450 °F | 232.2 °C |
How to convert Fahrenheit to Celsius
The formula
°C = (°F − 32) × 5/9. The two scales start from different zero points, so there is a subtraction as well as a multiplication.
Worked through for 72
Subtract 32: 72 − 32 = 40. Multiply by 5/9: 40 × 5 ÷ 9 = 22.222222. Rounded, that is 22.2 °C.
In your head
Take away 30 and halve it: 70 °F → 40 ÷ 2 = 20 °C (close enough for weather).
Every F to C page
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Decimals, negatives and cooking temperatures
The other way: C to F.
Questions
What is the formula for F to C?
°C = (°F − 32) × 5/9. Because the two scales start at different zero points, you cannot use a single multiplier.
How can I estimate it in my head?
Take away 30 and halve it: 70 °F → 40 ÷ 2 = 20 °C (close enough for weather).
Where do the conversion factors come from?
Water freezes at 32 °F and 0 °C and boils at 212 °F and 100 °C, so 180 Fahrenheit degrees span the same range as 100 Celsius degrees: a ratio of 9 to 5.