Looking to change Fahrenheit to Celsius or Celsius to Fahrenheit? Use our simple Celsius to Fahrenheit Temperature Converter, our temperature conversion charts, or calculate C to F or F to C yourself using the conversion formulas.

You are watching: -40 degrees f in c

The Fahrenheit temperature scale is named for German physicist Daniel Gabriel Fahrenheit and is the measurement of temperature commonly used by the United States (and its associated territories) and by several nations in the Caribbean. On the Fahrenheit scale, water freezes at 32°F and boils at 212°F (at sea level).

The Celsius temperature scale—originally called centigrade and later renamed for Swedish astronomer Anders Celsius—is used almost everywhere else in the world. On the Celsius scale, water freezes at 0°C and boils at 100°C (at sea level).

### F to C: Fahrenheit to Celsius Conversion Calculator

FahrenheitCelsius
°F°C

Enter a value for Fahrenheit or Celsius to convert to the other.

### F° to C°: Fahrenheit to Celsius Conversion Formula

To convert temperatures in degrees Fahrenheit to Celsius, subtract 32 and multiply by .5556 (or 5/9).

Example: (50°F - 32) x .5556 = 10°C

Fahrenheit

Celsius

-40°F-40°C
-30°F-34°C
-20°F-29°C
-10°F-23°C
0°F-18°C
10°F-12°C
20°F-7°C
32°F0°C
40°F4°C
50°F10°C
60°F16°C
70°F21°C
80°F27°C
90°F32°C
100°F38°C

### C° to F°: Celsius to Fahrenheit Conversion Formula

To convert temperatures in degrees Celsius to Fahrenheit, multiply by 1.8 (or 9/5) and add 32.

Example: (30°C x 1.8) + 32 = 86°F

Celsius

Fahrenheit

-40°C-40°F
-30°C-22°F
-20°C-4°F
-10°C14°F
0°C32°F
10°C50°F
20°C68°F
30°C86°F
40°C104°F
50°C122°F
60°C140°F
70°C158°F
80°C176°F
90°C194°F
100°C212°F

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