Temperature Conversion Formula and Calculator: Celsius to Fahrenheit (2024)

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Temperature Conversion Formula and Calculator: Celsius to Fahrenheit (1)

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Temperature Conversion Formula and Calculator: Celsius to Fahrenheit (2)

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F to C: Fahrenheit to Celsius Conversion Calculator

°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 changeFahrenheit to Celsiusor Celsius to Fahrenheit. We also have a Temperature Conversion Calculator for those who just want ananswer!

The Temperature ConversionFormula

The conversion formulas we use are thestandard ones in most textbooks.

How Do You Convert Fahrenheit toCelsius?

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


  • Windchill Chart for the United States

  • Measurements and Conversions Chart

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

How Do You Convert Celsius toFahrenheit?

To convert temperatures in degrees Celsius to Fahrenheit, multiply by 1.8 (or 9/5) and add32.

  • Example: (30°C x 1.8) + 32 =86°F’

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

Fahrenheit to Celsius Conversion Chart



Celsius to Fahrenheit Conversion Chart




About Fahrenheit andCelsius

The Fahrenheit temperature scale is named for German physicist Daniel Gabriel Fahrenheitand is thetemperature 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 sealevel).

The Celsiustemperature scale—originally calledcentigrade andlater renamedfor Swedish astronomer Anders Celsius—isused 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 sealevel).


  • Another interesting (and fun!) temperature conversionis turning cricket chirps into degrees Fahrenheit. Did you know that crickets can tell you how warm it is outside? Find outhow to tell the temperature from cricket chirpshere!
  • Looking for some cooking conversions? Learn about easy substitutions and conversions in the kitchen.
  • Want to convert a measurementto metric (or back)?Check out our handy conversion chart for the metric system.

Weather References

Temperature Conversion Formula and Calculator: Celsius to Fahrenheit (3)


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Add a Comment

If -40 is the same on both scales, is there a temperature above 0 where both Celsius and farenheit read the same amount?

  • Reply

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)

  • Reply

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 aconcern).

  • Reply

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.

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IS THIS TRUE? How to convert Celsius to fahrenheit

  • Reply

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.

  • Reply

I need clear examples

  • Reply

I cannot change the Fahrenheit to Celsius. I use the calculator, it is (37-32) x 0.5556, right

  • Reply

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...)

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Temperature Conversion Formula and Calculator: Celsius to Fahrenheit (2024)
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