Temperature conversion
Convert Fahrenheit to Celsius
To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9. For example, (68 °F − 32) × 5/9 = 20 °C.
Fahrenheit to Celsius is the conversion for filling in metric forms, reading scientific or medical figures, and understanding a US temperature in the scale the rest of the world uses. Enter any Fahrenheit temperature and the Celsius value appears instantly, with the formula shown.
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How to convert Fahrenheit to Celsius
Formula
°C = (°F − 32) × 5/9 °F = °C × 9/5 + 32Because the scales don't share a zero, you must subtract the 32-degree offset first and only then scale by 5/9. The two scales read the same at −40°.
| Fahrenheit | Celsius |
|---|---|
| -40 °F | -40 °C scales meet |
| 0 °F | -17.78 °C |
| 32 °F | 0 °C water freezes |
| 50 °F | 10 °C |
| 68 °F | 20 °C room temp |
| 98.6 °F | 37 °C body temp |
| 100 °F | 37.78 °C |
| 150 °F | 65.56 °C |
| 212 °F | 100.00 °C water boils |
| 350 °F | 176.67 °C oven |
Worked example
A recipe gives an oven temperature of 350 °F and your oven dial is in Celsius. Subtract 32 to get 318, then multiply by 5/9 for about 177 °C — most cooks round to 180 °C. A fever reading of 100.4 °F becomes (100.4 − 32) × 5/9 = 38 °C.
Shortcut. Fast approximation: subtract 30 and halve. 68 °F → (68 − 30) ÷ 2 = 19 °C (true value 20), close enough for everyday weather.
Good to know
The order matters: subtract 32 before multiplying, not after. Helpful anchors: 32 °F is freezing, 68–72 °F is room temperature, 98.6 °F is body temperature, and 212 °F is boiling. For cooking, 350 °F ≈ 177 °C (round to 180) and 400 °F ≈ 204 °C (round to 200).
Frequently asked questions
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, then multiply by 5/9. So 77 °F is (77 − 32) × 5/9 = 25 °C.
What is 100 °F in Celsius?
100 °F equals about 37.8 °C — just above body temperature. 90 °F is 32.2 °C and 70 °F is 21.1 °C.
Is there a quick Fahrenheit to Celsius trick?
Yes: subtract 30 and halve. It estimates a few degrees low at warm temperatures but is handy for weather.
What oven temperature is 350 °F in Celsius?
350 °F is about 177 °C, which most recipes round to 180 °C. 400 °F is roughly 200 °C.
At what temperature do Fahrenheit and Celsius match?
At −40 degrees: −40 °F equals −40 °C, the single point where both scales agree.