C to F
Celsius to Fahrenheit: °F = °C × 9/5 + 32. Type a number and read the answer straight off the scale.
C to F chart of common values
| Degrees Celsius | Degrees Fahrenheit |
|---|---|
| -40 °C | -40 °F |
| -20 °C | -4 °F |
| -10 °C | 14 °F |
| 0 °C | 32 °F |
| 5 °C | 41 °F |
| 10 °C | 50 °F |
| 15 °C | 59 °F |
| 18 °C | 64.4 °F |
| 20 °C | 68 °F |
| 21 °C | 69.8 °F |
| 22 °C | 71.6 °F |
| 24 °C | 75.2 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 35 °C | 95 °F |
| 36.6 °C | 97.9 °F |
| 37 °C | 98.6 °F |
| 38 °C | 100.4 °F |
| 40 °C | 104 °F |
| 50 °C | 122 °F |
| 100 °C | 212 °F |
| 180 °C | 356 °F |
| 200 °C | 392 °F |
| 220 °C | 428 °F |
How to convert Celsius to Fahrenheit
The formula
°F = °C × 9/5 + 32. The two scales start from different zero points, so there is a subtraction as well as a multiplication.
Worked through for 20
Multiply by 9/5 (1.8): 20 × 1.8 = 36. Add 32: 36 + 32 = 68. Rounded, that is 68 °F.
In your head
Double it and add 30: 20 °C → 40 + 30 = 70 °F (close enough for weather).
Every C to F page
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Decimals, negatives and cooking temperatures
The other way: F to C.
Questions
What is the formula for C to F?
°F = °C × 9/5 + 32. Because the two scales start at different zero points, you cannot use a single multiplier.
How can I estimate it in my head?
Double it and add 30: 20 °C → 40 + 30 = 70 °F (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.