Celsius to Fahrenheit converter (°C to °F)
°C to °F converter
Enter a value on either side to convert.
To convert Celsius to Fahrenheit, multiply by 1.8 and add 32: F = C × 1.8 + 32. For example, 20 °C is 68 °F, and normal body temperature of 37 °C is 98.6 °F. The converter below works in both directions as you type, and the table further down covers weather, fever, and oven temperatures.
The formula from degrees Celsius to degrees Fahrenheit is F = C × 1.8 + 32. The two scales use different degree sizes and different zero points, so no single factor can work: the multiplication rescales the degrees and the offset shifts the zero. The converter applies the full formula internally and rounds only what you see to 4 decimal places. For the derivation and more examples, read the temperature conversion formulas guide.
Worked example: 20 °C to °F
To convert 20 degrees Celsius to degrees Fahrenheit, apply the formula F = C × 1.8 + 32:
20 × 1.8 + 32 = 68
Rounded to 4 decimal places, 20 °C is 68 °F.
°C to °F conversion table
| °C | °F |
|---|---|
| -40 | -40 |
| -30 | -22 |
| -20 | -4 |
| -10 | 14 |
| 0 | 32 |
| 5 | 41 |
| 10 | 50 |
| 15 | 59 |
| 20 | 68 |
| 25 | 77 |
| 30 | 86 |
| 35 | 95 |
| 36.6 | 97.88 |
| 37 | 98.6 |
| 37.5 | 99.5 |
| 38 | 100.4 |
| 39 | 102.2 |
| 40 | 104 |
| 45 | 113 |
| 50 | 122 |
| 60 | 140 |
| 70 | 158 |
| 80 | 176 |
| 90 | 194 |
| 100 | 212 |
| 150 | 302 |
| 200 | 392 |
| 250 | 482 |
Values are rounded to 4 decimal places with trailing zeros trimmed. Need a value that is not listed? Use the converter at the top of the page.
Related conversions
Frequently asked questions
What is 37 °C in Fahrenheit?
37 °C is 98.6 °F, which is normal human body temperature. The arithmetic is 37 × 1.8 + 32 = 98.6. A reading of 100.4 °F (38 °C) or higher is generally considered a fever.
What is the formula for Celsius to Fahrenheit?
Multiply the Celsius temperature by 1.8 and add 32, written as F = C × 1.8 + 32. The 1.8 rescales the degree size, because a Celsius degree is 1.8 times larger than a Fahrenheit degree, and the 32 shifts the zero point, since water freezes at 0 °C but 32 °F.
How do I convert Celsius to Fahrenheit in my head?
Double the Celsius value and add 30. For 20 °C that gives 70 °F, close to the exact 68 °F, only about 2 °F high. The estimate is exact at 10 °C and drifts slowly as you move away from it.
Why is -40 °C the same as -40 °F?
-40 °C converts to -40 °F, the single point where the two scales agree. Below -40 the Fahrenheit reading is lower than the Celsius reading, and above it the Fahrenheit reading is higher, because the scales have different degree sizes and different zero points.
What is 100 °C in Fahrenheit?
100 °C is 212 °F, the boiling point of water at sea level. At the other end of the scale, 0 °C is 32 °F, where water freezes.