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Temperature Conversion Formula and Calculator: Celsius to Fahrenheit

temperature conversion calculator, blue sky with clouds with a thermometer in view. Celsius and Fahrenheit

Find the Temperature Conversion Formula, Chart, and Calculator!

Written By: Catherine Boeckmann Executive Digital Editor and Master Gardener

F to C: Fahrenheit to Celsius Conversion Calculator

Fahrenheit Celsius
°F °C

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

What is 70°F in Celsius? What is 0°C in Fahrenheit? Here is the temperature conversion formula and chart to change Fahrenheit to Celsius or Celsius to Fahrenheit. We also have a Temperature Conversion Calculator for those who just want an answer!

The Temperature Conversion Formula

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

How Do You Convert Fahrenheit to Celsius?

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

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  • Example: (50°F - 32) x .5556 = 10°C

How Do You Convert Celsius to Fahrenheit?

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

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
Celsius to Fahrenheit Conversion Chart

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

About Fahrenheit and Celsius

The Fahrenheit temperature scale is named for German physicist Daniel Gabriel Fahrenheit and is the temperature measurement commonly used by the United States (and its associated territories) and several Caribbean nations. 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, the freezing point of water is 0°C, and the boiling point of water is 100°C (at sea level).

Other Conversions

Weather References
About The Author
Catherine Boeckmann

Catherine Boeckmann

Executive Digital Editor and Master Gardener

Catherine Boeckmann is the Executive Digital Editor of Almanac.com, the website companion of The Old Farmer's Almanac. She covers gardening, plants, pest control, soil composition, seasonal and moon c...
Read More from Catherine Boeckmann

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Comments

<span>Joe</span> Sat, 09/13/2025 - 14:50
omg. these conversions are insane. Celsius to Fahrenheit is SO EASY. °C x1.8 +32 = DONE °F °F -32 ÷1.8 = DONE °C e.x. 40°C x1.8 +32 = 104°F 104°F -32 ÷1.8 = 40°C
<span>John Bouris</span> Sun, 02/05/2023 - 13:43
If -40 is the same on both scales, is there a temperature above 0 where both Celsius and farenheit read the same amount?
<span>Dan Parvaz</span> Sat, 04/01/2023 - 15:56
The conversion scale between °C and °F is a straight line. So is the line y=x. Linear equations can either have: * No solutions (parallel lines) * One solution (they cross once and diverge from there on both sides) * Infinite solutions (they're the same line)
<a title="View user profile." href="/author/editors">The Editors</a> Sat, 12/17/2022 - 12:23

We looked at comments below and found one comment interesting.  When you convert Fahrenheit to Celsius (as shown above), the last thing you need to do is multiply by 5/9 or .5556. Since 5/9 is only approximately equal to .5556, you do get slightly different answers depending on whether you use 5/9 or .5556. The commenter suggests that instead of multiplying by 5/9 or .5556 that you divide by 9/5 or 1.8. This is because 9/5 is exactly equal to 1.8 and, therefore, you will avoid getting slightly different answers. The only drawback that we see in using this method is that it is not the formula you normally see in textbooks (if that's a concern).

 <span>Bps</span> Thu, 05/11/2023 - 16:42
I have to do temperature conversions frequently and have been using the "1.8 method" for years. It is far easier than messing with fractions, especially when teaching someone else to do conversions. I can't understand why anyone still teaches the 5/9, 9/5 method.
<span>Maynard</span> Sat, 06/01/2024 - 02:24
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<span>Mike</span> Sun, 12/04/2022 - 05:24
This is much easier: C->F ADD 40, Divide by 5, Multiply by 9, SUBTRACT 40 F->C ADD 40, Divide by 9, Multiply by 5, SUBTRACT 40 Notes: always ADD 40 first, if you *want Fahrenheit* then you want 'more' range so multiply by 9 (and divide by 5), if you *want Celsius* then you want 'less' range so divide by 9 (and multiply by 5), then SUBTRACT 40 No 32's in sight.
<span>Alex K Howe</span> Sun, 02/26/2023 - 17:05
I need clear examples
<span>Morris</span> Fri, 12/02/2022 - 03:16
I cannot change the Fahrenheit to Celsius. I use the calculator, it is (37-32) x 0.5556, right