Fahrenheit to Celsius
Result:
Enter a temperature to convert.
Convert Fahrenheit to Celsius. From is set to Fahrenheit and To is set to Celsius. The result updates as you type. Other units are on the temperature converter. The other direction is Celsius to Fahrenheit.
Fahrenheit to Celsius formula
The NIST SI Units – Temperature page gives this relation. Dividing by 1.8 is the same as multiplying by 5/9.
Formula: °C = (°F − 32) × 5/9.
The converter multiplies and divides by 5 and 9, then rounds the displayed result to two decimal places.
Example: 68 °F is (68 − 32) × 5/9 = 20 °C. The converter shows 20.00 C.
Fahrenheit to Celsius reference table
Each value below is the converter result at two decimal places. Enter the same Fahrenheit temperature in the form above and the result should match.
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| −40 | −40.00 |
| 0 | −17.78 |
| 32 | 0.00 |
| 40 | 4.44 |
| 50 | 10.00 |
| 60 | 15.56 |
| 70 | 21.11 |
| 72 | 22.22 |
| 80 | 26.67 |
| 90 | 32.22 |
| 98.6 | 37.00 |
| 100 | 37.78 |
| 212 | 100.00 |
| 300 | 148.89 |
| 325 | 162.78 |
| 350 | 176.67 |
| 375 | 190.56 |
| 400 | 204.44 |
| 425 | 218.33 |
| 450 | 232.22 |
Fahrenheit to Celsius examples
Oven temperature: A recipe that says 350 °F is (350 − 32) × 5/9 = 176.67 °C.
Room temperature: A thermostat set to 72 °F is 22.22 °C.
Thermometer reading: 98.6 °F is 37 °C. The converter shows 37.00 C.
Quick mental math (approximation)
To estimate Celsius, subtract 30 from the Fahrenheit temperature and halve the result. Example: 70 °F minus 30 is 40, halved is about 20 °C. The exact result is 21.11 °C.
This shortcut is an approximation and only works near everyday weather temperatures. It is exact at 50 °F and drifts as you move away: at 86 °F it gives 28 °C instead of 30 °C, and at an oven temperature of 350 °F it gives 160 °C instead of 176.67 °C. Use the converter or the exact formula for cooking, medical readings, or anything you will record.
Fahrenheit to Celsius FAQ
Why subtract 32 before multiplying?
32 °F is the same temperature as 0 °C. Subtracting 32 measures how far the reading is above freezing in Fahrenheit degrees, and multiplying by 5/9 converts that distance to Celsius degrees.
What is 0 °F in Celsius?
0 °F is (0 − 32) × 5/9, which the converter shows as −17.78 °C.
Is there a temperature where Fahrenheit and Celsius are the same?
Yes. −40 °F is exactly −40 °C. Solving (F − 32) × 5/9 = F gives F = −40.