Temperature Conversion: Celsius to Fahrenheit | F to C or C to F | The Old Farmer's Almanac

Temperature Conversion Formula: Celsius to Fahrenheit

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Find the temperature conversion formula, chart, and calculator!

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F to C: Fahrenheit to Celsius Conversion Calculator

Fahrenheit Celsius
°F °C

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


Here’s a temperature conversion formula, chart, AND calculator to change Fahrenheit to Celsius or Celsius to Fahrenheit. Whether you want to understand the math or just want the answer now, you can go from C to F or F to C!

For those who just want an answer, above is our Temperature Conversion Calculator.

The Temperature Conversion Formula

The conversion formulas we use are the standard ones that are used in most textbooks. 

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

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’

Here are two handy charts that convert from F to C and also from C to F.

Fahrenheit to Celsius Conversion Chart



-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°F 0°C
40°F 4°C
50°F 10°C
60°F 16°C
70°F 21°C
80°F 27°C
90°F 32°C
100°F 38°C

Celsius to Fahrenheit Conversion Chart



-40°C -40°F
-30°C -22°F
-20°C -4°F
-10°C 14°F
0°C 32°F
10°C 50°F
20°C 68°F
30°C 86°F
40°C 104°F
50°C 122°F
60°C 140°F
70°C 158°F
80°C 176°F
90°C 194°F
100°C 212°F

About Fahrenheit and Celsius

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).

Other Conversions