Temperature conversion
40 °F to °C
4.44 °C
40 degrees Fahrenheit = 4.44 degrees Celsius. Exact factor: °C = (°F − 32) × 5/9.
Live converter
Edit either field — the other updates instantly. Type decimal values like 38.4.
The formula
°C = (°F − 32) × 5/9
Worked example: (40 − 32) × 5/9 = 4.44 °C.
Values near 40 °F
| °F | °C |
|---|---|
| 37 | 2.78 |
| 38 | 3.33 |
| 39 | 3.89 |
| 40this page | 4.44 |
| 41 | 5 |
| 42 | 5.56 |
| 43 | 6.11 |
Frequently asked
How do you convert degrees Fahrenheit to degrees Celsius?
Apply the formula °C = (°F − 32) × 5/9. Enter any value in the live converter above and the result updates as you type.
What is 40 °F in °C?
40 °F equals 4.44 °C. The reference table below shows the values immediately around 40 °F.
Why does temperature conversion add 32?
The two scales have different zero points and step sizes. Water freezes at 32 °F but 0 °C, so the formula rescales by 5/9 and shifts by the 32-degree offset.