Fahrenheit to Celsius converter
1 °F = −17.2222222222 °C
Subtract 32, then multiply by 5/9. Oven settings in American recipes and weather forecasts are the classic reasons to reach for this.
98.6 °F = 37 °C
Formula: °C = (°F − 32) × 5/9
98.6 °F in every temperature unit
- degree Celsius
- kelvin
- degree Rankine
How to convert degrees Fahrenheit to degrees Celsius
°C = (°F − 32) × 5/9
Example: 98.6 °F gives 37 °C.
degree Fahrenheit: t/°F = (t/°C) × 9/5 + 32 (NIST SP 811, B.9)
degree Celsius: t/°C = T/K − 273.15 (BIPM SI Brochure)
Going the other way? Use the celsius to fahrenheit converter.
Drag the thermometer
Two things change between the scales: where zero sits (32 °F is 0 °C) and how big a degree is (a Celsius degree is 1.8 Fahrenheit degrees). That is why you multiply and add.
20 °C=68 °F
20 × 1.8 = 36, then + 32 = 68
The “double it and add 30” shortcut gives 70 °F here, off by 2°. It is close only near 10 °C.
Fahrenheit to Celsius table
| degrees Fahrenheit (°F) | degrees Celsius (°C) |
|---|---|
| −40 | −40 |
| −20 | −28.88889 |
| 0 | −17.77778 |
| 10 | −12.22222 |
| 20 | −6.666667 |
| 32 | 0 |
| 40 | 4.444444 |
| 50 | 10 |
| 60 | 15.55556 |
| 68 | 20 |
| 70 | 21.11111 |
| 72 | 22.22222 |
| 75 | 23.88889 |
| 80 | 26.66667 |
| 85 | 29.44444 |
| 90 | 32.22222 |
| 95 | 35 |
| 98.6 | 37 |
| 100 | 37.77778 |
| 104 | 40 |
| 212 | 100 |
| 250 | 121.1111 |
| 300 | 148.8889 |
| 350 | 176.6667 |
| 375 | 190.5556 |
| 400 | 204.4444 |
| 425 | 218.3333 |
| 450 | 232.2222 |
Questions
How many degrees Celsius are in 1 degree Fahrenheit?
1 °F = −17.2222222222 °C. Temperature scales have offsets, so this is not a simple multiplier.
What is the formula to convert degrees Fahrenheit to degrees Celsius?
°C = (°F − 32) × 5/9. t/°F = (t/°C) × 9/5 + 32; t/°C = T/K − 273.15.
Is this conversion exact?
Yes. The Celsius–Fahrenheit relationship is defined exactly; results are only rounded for display.
What is 98.6 °F in °C?
98.6 °F = 37 °C.