Unit Converter
Fahrenheit to Celsius Converter
Convert Fahrenheit to Celsius instantly. 1 °F = -17.2222 °C. Free, accurate temperature converter for all scales.
Celsius
-17.2222 °C
1 °F = -17.2222 °C
Fahrenheit to Celsius formula
°C = (°F − 32) × 5/9Fahrenheit and Celsius are two temperature scales with different zero points and sizing. Celsius sets 0° at water's freezing point and 100° at boiling; Fahrenheit places these at 32° and 212°. The conversion formula (°C = (°F − 32) × 5/9) accounts for both the 32-degree offset and the 9/5 ratio between scale divisions.
Fahrenheit to Celsius conversion table
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 °F | -40 °C |
| -20 °F | -28.8889 °C |
| -10 °F | -23.3333 °C |
| 0 °F | -17.7778 °C |
| 10 °F | -12.2222 °C |
| 20 °F | -6.6667 °C |
| 25 °F | -3.8889 °C |
| 30 °F | -1.1111 °C |
| 37 °F | 2.7778 °C |
| 40 °F | 4.4444 °C |
| 50 °F | 10 °C |
| 100 °F | 37.7778 °C |
When you need to convert fahrenheit to celsius
- Travel: Converting weather forecasts when visiting countries using Celsius (Europe, Canada, most of the world)
- Cooking: Adjusting oven temperatures from recipes written in one scale to your appliance's setting
- Science & Medicine: Converting patient temperatures or lab readings between clinical measurement systems
- Engineering: Switching between specifications in materials science, HVAC, or industrial processes
- Weather: Understanding temperature reports across international news, apps, or forecasts
Frequently asked questions
Why is 1 °F so cold in Celsius?
Because 1 °F is just 1 degree above Fahrenheit's zero point (−459.67 °C), which is far below water's freezing point (0 °C). Most everyday temperatures sit much higher on the Fahrenheit scale.
Is the conversion formula the same for all temperatures?
Yes. The formula (°C = (°F − 32) × 5/9) works for any Fahrenheit value. First subtract 32 to remove the offset, then multiply by 5/9 to scale to Celsius units.
What's the easiest way to remember the conversion?
Remember 32 °F = 0 °C (freezing) and 212 °F = 100 °C (boiling). For rough mental math, subtract 30, then halve the result—it's close enough for everyday temperatures.