40 Fahrenheit to Celsius
40 degrees Fahrenheit equals
4.44°C
4.44 degrees Celsius
40°F works out to 4.44°C, right around the freezing point of water — 0°C or 32°F. This is typical winter weather in temperate regions and the band most refrigerators hold.
How to convert 40°F to °C
Formula
°C = (°F − 32) × 5/9
Substituting 40°F
- 40 − 32 = 8
- 8 × 5/9 = 4.44
Fahrenheit places the freezing point of water at 32 rather than 0, so that offset comes off first. What remains is then scaled by 5/9, because a Celsius degree covers 1.8 times as much temperature change as a Fahrenheit degree.
How 40°F compares
| Reference point | Temperature | Difference |
|---|---|---|
| Freezing point of water | 0°C / 32°F | 4.4°C (8°F) warmer |
| Room temperature | 21°C / 69.8°F | 16.6°C (29.8°F) colder |
| Body temperature | 37°C / 98.6°F | 32.6°C (58.6°F) colder |
| Boiling point of water | 100°C / 212°F | 95.6°C (172°F) colder |