To convert Fahrenheit to Celsius, subtract 32, then multiply by 5/9. A 350 °F oven is 176.67 °C, normal body temperature of 98.6 °F is 37 °C, and 72 °F room temperature is 22.2 °C.
The US uses Fahrenheit for weather, thermostats and cooking. Nearly everywhere else, and all of science, uses Celsius.
How to use the fahrenheit to celsius converter
- Type the value in Fahrenheit into the box. Decimals and negative values are fine.
- The result in Celsius updates as you type, along with the working.
- Need the other way? Switch the direction menu, or open the celsius to fahrenheit converter.
Formula
The Fahrenheit and Celsius scales differ in both size and zero point: water freezes at 32 °F / 0 °C and boils at 212 °F / 100 °C at sea level, so 180 Fahrenheit degrees span the same range as 100 Celsius degrees (ratio 9/5). The formulas are exact.
Worked example
A recipe says to bake at 350 °F. What is that in Celsius?
- Subtract 32: 350 − 32 = 318.
- Multiply by 5/9: 318 × 5 ÷ 9 = 176.67.
- Result: 176.67 °C. Metric recipes round this to 180 °C (or about 160 °C for a fan oven).
Fahrenheit to Celsius chart
Common values, rounded to 2 decimal places.
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 °F | -40 °C |
| -10 °F | -23.33 °C |
| 0 °F | -17.78 °C |
| 10 °F | -12.22 °C |
| 20 °F | -6.67 °C |
| 32 °F | 0 °C |
| 40 °F | 4.44 °C |
| 50 °F | 10 °C |
| 60 °F | 15.56 °C |
| 68 °F | 20 °C |
| 70 °F | 21.11 °C |
| 72 °F | 22.22 °C |
| 80 °F | 26.67 °C |
| 90 °F | 32.22 °C |
| 98.6 °F | 37 °C |
| 100 °F | 37.78 °C |
| 100.4 °F | 38 °C |
| 212 °F | 100 °C |
| 300 °F | 148.89 °C |
| 325 °F | 162.78 °C |
| 350 °F | 176.67 °C |
| 375 °F | 190.56 °C |
| 400 °F | 204.44 °C |
| 425 °F | 218.33 °C |
| 450 °F | 232.22 °C |
Everyday Fahrenheit landmarks
- Weather: 32 °F is freezing (0 °C), 50 °F is cool (10 °C), 68 °F is mild (20 °C), 86 °F is hot (30 °C), 100 °F is 37.8 °C.
- Fever: 100.4 °F (38 °C) is the usual fever threshold.
- Cooking: 165 °F (73.9 °C) is the USDA safe minimum for poultry.
- Oven: 325, 350, 375, 400 and 425 °F are 163, 177, 191, 204 and 218 °C.
Quick mental math
For weather, subtract 30 and halve: 80 °F → 50 → 25 °C (exact: 26.7). It's close between about 40 and 80 °F and drifts at the extremes, so use the exact formula for cooking and medicine.
Related conversions
Going the other way: celsius to fahrenheit converter. Related pages: . For other units in the same family, use the full temperature converter.
Caveats and assumptions
- Values below −459.67 °F (absolute zero) are flagged as impossible.
- Results show up to 10 significant digits; the chart is rounded for reading. Keep full precision for engineering, medical or legal work.
Frequently asked questions
What is the formula for Fahrenheit to Celsius?
°C = (°F − 32) × 5/9. Subtract 32 first, then multiply.
What is 98.6 °F in Celsius?
Exactly 37 °C.
At what temperature are Fahrenheit and Celsius equal?
−40. −40 °F equals −40 °C.
What is 100 °F in Celsius?
37.78 °C.
Sources
- NIST — SI Units: Temperature — Fahrenheit–Celsius formulas
- NIST SP 811 Appendix B.9 — Conversion factors — temperature conversion formulas
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