Celsius to Fahrenheit
Result:
Enter a temperature to convert.
Convert Celsius to Fahrenheit. From is set to Celsius and To is set to Fahrenheit. The result updates as you type. Other units are on the temperature converter. The other direction is Fahrenheit to Celsius.
Celsius to Fahrenheit formula
The NIST SI Units – Temperature page gives this relation. 1.8 is exactly 9/5.
Formula: °F = (°C × 9/5) + 32.
The converter multiplies and divides by 9 and 5, then rounds the displayed result to two decimal places.
Example: 20 °C is (20 × 9/5) + 32 = 68 °F. The converter shows 68.00 F.
Celsius to Fahrenheit reference table
Each value below is the converter result at two decimal places. Enter the same Celsius temperature in the form above and the result should match.
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| −40 | −40.00 |
| −20 | −4.00 |
| −10 | 14.00 |
| 0 | 32.00 |
| 5 | 41.00 |
| 10 | 50.00 |
| 15 | 59.00 |
| 20 | 68.00 |
| 25 | 77.00 |
| 30 | 86.00 |
| 37 | 98.60 |
| 40 | 104.00 |
| 100 | 212.00 |
| 150 | 302.00 |
| 160 | 320.00 |
| 180 | 356.00 |
| 200 | 392.00 |
| 220 | 428.00 |
| 250 | 482.00 |
Celsius to Fahrenheit examples
Oven temperature: A recipe that says 180 °C is (180 × 9/5) + 32 = 356 °F.
Weather: A forecast high of 25 °C is 77 °F, and 0 °C, where water freezes, is 32 °F.
Thermometer reading: 37 °C is 98.6 °F. The converter shows 98.60 F.
Quick mental math (approximation)
To estimate Fahrenheit, double the Celsius temperature and add 30. Example: 15 °C doubled is 30, plus 30 is about 60 °F. The exact result is 59 °F.
This shortcut is an approximation and only works near everyday weather temperatures. It is exact at 10 °C and drifts as you move away: at 30 °C it gives 90 °F instead of 86 °F, and at an oven temperature of 180 °C it gives 390 °F instead of 356 °F. Use the converter or the exact formula for cooking, medical readings, or anything you will record.
Celsius to Fahrenheit FAQ
Why can't I just multiply by 1.8?
The two scales start at different points. 0 °C is 32 °F, so after multiplying by 9/5 (1.8) you must add 32. Example: 20 °C × 1.8 = 36, plus 32 is 68 °F.
Is there a temperature where Celsius and Fahrenheit are the same?
Yes. −40 °C is exactly −40 °F. Solving (C × 9/5) + 32 = C gives C = −40.
What is 100 °C in Fahrenheit?
100 °C is 212 °F. That is the boiling point of water at standard atmospheric pressure.