Conversion result
40 °F = 4.4444 °C
How the conversion works
Converting from Fahrenheit to Celsius uses this relationship:
°C = (°F − 32) × 5/9
Plugging in 40 °F gives 4.4444 °C. Adjust the value in the calculator above if you need a different amount.
When people convert Fahrenheit
This temperature conversion shows up in recipes, fitness tracking, travel, shopping, and school homework. Bookmark nearby values from the related list, or open the full unit converter for more unit pairs.