Celsius to Fahrenheit (°C to °F)
To convert Celsius to Fahrenheit, multiply by 9/5 (or 1.8) and add 32. A mild 20 °C day is 68 °F, and 30 °C is 86 °F. Type into either field to convert either way.
Convert °C to °F
Result
°C to °F
20 °C = 68 °F
Formula: °F = °C × 9/5 + 32. The scales meet at −40°.
Show the mathHow it was calculated
°F = °C × 9/5 + 32
Uses exact legal definitions; results are rounded to 6 significant figures for display.
How to convert °C to °F
°F = °C × 9/5 + 32
Multiply the Celsius value by 9/5 (1.8), then add 32.
Worked example: converting 20 °C:
- 20 °C × 9/5 = 36
- 36 + 32 = 68 °F
°C to °F conversion table
Common values, each computed with the exact formula and rounded to 6 significant figures.
| Degrees Celsius (°C) | Degrees Fahrenheit (°F) |
|---|---|
| -40 °C | -40 °F |
| -30 °C | -22 °F |
| -20 °C | -4 °F |
| -18 °C | -0.4 °F |
| -10 °C | 14 °F |
| -5 °C | 23 °F |
| 0 °C | 32 °F |
| 4 °C | 39.2 °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 |
| 25 °C | 77 °F |
| 28 °C | 82.4 °F |
| 30 °C | 86 °F |
| 32 °C | 89.6 °F |
| 35 °C | 95 °F |
| 37 °C | 98.6 °F |
| 38 °C | 100.4 °F |
| 40 °C | 104 °F |
| 45 °C | 113 °F |
| 50 °C | 122 °F |
| 60 °C | 140 °F |
| 70 °C | 158 °F |
| 80 °C | 176 °F |
| 90 °C | 194 °F |
| 100 °C | 212 °F |
| 120 °C | 248 °F |
| 150 °C | 302 °F |
| 160 °C | 320 °F |
| 180 °C | 356 °F |
| 190 °C | 374 °F |
| 200 °C | 392 °F |
| 220 °C | 428 °F |
| 230 °C | 446 °F |
| 250 °C | 482 °F |
Quick reference: everyday degrees Celsius in degrees Fahrenheit
Typical freezer setting
-18 °C = -0.4 °F
Water freezes (at sea level)
0 °C = 32 °F
Mild spring day
20 °C = 68 °F
Normal body temperature
37 °C = 98.6 °F
Water boils (at sea level)
100 °C = 212 °F
Metric recipe oven setting
180 °C = 356 °F
Reading a Celsius weather forecast
Most countries forecast in Celsius, and a few anchor points make a forecast easy to read. 0 °C (32 °F) means frost or ice. 10 °C (50 °F) calls for a jacket. 20 °C (68 °F) is mild, 25 °C (77 °F) is a warm summer day, and 35 °C (95 °F) is hot.
Each Celsius degree is 1.8 Fahrenheit degrees. So a forecast that says it will be 5 degrees warmer tomorrow means 9 °F warmer. That only applies to changes in temperature. To convert an actual temperature you still need to add the 32.
Fridge, freezer and oven settings
Food-storage guidance is often given in both scales. A refrigerator should be at or below 4 °C (39.2 °F), and a freezer at −18 °C, which is 0 °F rounded (exactly −0.4 °F). On a European fridge or a metric recipe card, these are the numbers to look for.
Metric oven settings come in round tens. 180 °C works out to 356 °F, but US cooks usually set 350 °F; 200 °C is 392 °F (set 400 °F), and 220 °C is 428 °F (set 425 °F). Ovens cycle several degrees above and below the set point anyway, so the nearest 25 °F step is close enough.
Frequently asked questions
What is the doubling shortcut for Celsius to Fahrenheit?
Double the Celsius figure and add 30. At 10 °C it is exact (50 °F). At 20 °C it gives 70 °F against an exact 68 °F, and at 30 °C it gives 90 °F against 86 °F. The error grows by about 0.2 °F for every degree away from 10 °C, so use it for weather, not for baking or medicine.
How do I convert Celsius to Kelvin as well?
Add 273.15 to the Celsius value. Kelvin uses the same size degree as Celsius but starts at absolute zero, so 20 °C is 293.15 K. Fahrenheit has its own absolute scale, Rankine, which starts at −459.67 °F. This converter won't accept values below absolute zero on either scale.
Is 37 °C or 37.5 °C a fever?
37 °C (98.6 °F) is the traditional average body temperature, not a fever. A reading of 38 °C (100.4 °F) or higher is the threshold commonly used for fever. Normal temperature varies by person, time of day and where it's measured, so ask a clinician how to interpret readings for a child or an unwell adult.