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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).

  • 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 digital home of The Old Farmer’s Almanac. She leads digital editorial strategy and publishing across a wide range of Almanac sub...

Read more from Catherine Boeckmann

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Comments

<span>Sean</span> Tue, 07/19/2022 - 15:09
Multiplying by 5/9? Not exactly "easy" though... As someone who has to work with both temperature systems, I use this for a quick and easy way to get a number close enough to understand. For C to F "double it and add 30" so 20 C = (2x20) + 30 = 70F which is close to the real value of 68F to know it's a nice day. F to C "subtract 30 and halve it" so 100F = (100-30)/2 = 35C which is close to the actual value of 37.8C and getting pretty warm. It's not perfect, but it is quick and easy enough to do in your head. Another trick? Remember that: 0C is 32F 16C is 61F, and 28C is 82F. If the number you want is close to those 3 numbers then just treat 2F = 1C and work it out from there. What is 20C? 16C + 4 = 61F + 8 = 69F which is close enough to 68F for me. What is 26F? 32-26 = 6F or 3C so it's 3C below freezing or -3C. (Side note, -40C is the same as -40F but by then who cares, that's just seriously cold everywhere...)
<span>Shadab Hussain</span> Tue, 06/28/2022 - 07:47
Useful Information, Helps a lot.
<span>Pillai</span> Tue, 11/30/2021 - 09:46
why we divide the value by 9/5 while convert C to F
<span>Jim</span> Sun, 09/04/2022 - 17:25
212F Water Boiling Temp minus 32F Water Freezing Temp = 180F Range 100C Water Boiling Temp minus 0C Water Boiling Temp = 100C Range Therefore 180 9 is the Ratio. ( + or - 32 depending which way you are converting). --- = - 100 5
<span>Jim</span> Sun, 09/04/2022 - 17:30
Previous message did not translate very well, From above 180 divided by 100 = 9/5
<span>Aarav</span> Fri, 09/13/2019 - 04:34
Awesome work guys. Keep providing good content. Thank you
<span>Barry M. Lamont</span> Mon, 02/11/2019 - 09:59
I spent four years in Montréal, where the weather forecast is always in Celsius; and I found that the easiest way to translate to the more familiar Fahrenheit was NOT to do the precise calculations in my head, or keep whipping out a device, but just to learn the 10s: -20C = -4F -10C = 14F 0C = 32F 10C = 50F 20C = 68F 30C = 86F 40C = 104F That gets you in the right ballpark immediately, and I never found it important to distinguish between, say, 63 and 65 degrees F - especially because other factors, like wind speed and humidity, will make a much larger difference in how hot or cold you actually feel. That range - a mere seven numbers to commit to memory - is really all you need; anything below -20C is "too damn cold", and anything above 40C is "too damn hot".
<span>Jessie Lau</span> Tue, 11/30/2021 - 11:54
thank you
<span>Ed Jurasek</span> Sun, 01/20/2019 - 18:39
Celsius to Fahrenheit 10 x 1.8 +32 =50 Fahrenheit celius 50 - 32 divided 1.8 = 10
<span>Adnan</span> Tue, 12/04/2018 - 11:24
Y=a+bx (regression equation) Y= Fahrenheit x= Celsius a=32 b=9/5