°C to °F Conversion: A Complete Guide

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You don’t have to be Einstein to use these fast and easy temperature conversion formulas
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In most countries of the world, temperature is measured in degrees Celsius (°C). But what are you supposed to do when you have to measure something in Fahrenheit? With the help of two simple formulas, it’s easy to convert between Celsius and Fahrenheit (and vice versa) whenever you may need to. Simply plug the known temperature into the formula of your choice, and you’re good to go!

Things You Should Know

  • Convert Celsius to Fahrenheit using the °F = (°C x 1.8) + 32 or °F = °C x + 32 formula.
  • Convert Fahrenheit to Celsius with the °C = (°F - 32) x formula.
Method 1
Method 1 of 2:

Celsius to Fahrenheit Formula

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  1. You may also use the equation °F = °C x + 32, which will produce the same answer since = 1.8. [1] Plug any Celsius temperature into either equation to convert it to Fahrenheit.
  2. Feel free to use a calculator if you’re crunched for time, or if you’d rather not do the math by hand. [2]
    • Example 1: If the Celsius temperature is 20, multiply 20 by 1.8 to get 36. Alternatively, multiply the temperature (20) by 9, which equals 180, then divide 180 by 5, which equals 36.
    • Example 2: If the Celsius temperature is -10, multiply -10 by 1.8 to get -18. Alternatively, multiply the temperature (-10) by 9, which equals -90, and then divide by 5—this also gives you -18.
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  3. After multiplying the temperature by 1.8 (or by 9, then dividing by 5), add 32 to the answer. [3]
    • Example 1: Add 32 to 36, which equals 68. So, 20°C is equal to 68°F.
    • Example 2: Add 32 to -18, which equals 14. So, -10°C is equal to 14°F.
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Method 2
Method 2 of 2:

Fahrenheit to Celsius Formula

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  1. Use °C = (°F - 32) x to convert Fahrenheit to Celsius. Simply plug in any Fahrenheit temperature and do the math to convert °F to °C. [4]
    • You may also use the equation °C = (°F - 32) , which will produce the same answer since dividing by 1.8 is the same as multiplying by =
  2. The first step is to take away 32 from the temperature in Fahrenheit. [5]
    • Example 1: If the Fahrenheit temperature is 90, subtract 32 from 90 to get 58.
    • Example 2: If the Fahrenheit temperature is -5, subtract 32 from -5 to get -37.
  3. Multiply the subtracted difference by to get the temperature in Celsius. After subtracting 32 from the temperature, multiply the answer you calculated by (or 0.55). [6]
    • Example 1: Multiply by , which gives you . Divide this fraction to get 32.2—thus, 90°F is equal to 32.2°C.
    • Example 2: Multiply by , which gives you . Divide this fraction to get -20.5—thus, -5°F is equal to -20.5°C.
    • Keep in mind that 0.55 is actually short for 0.5555555555555556—so, only use the abbreviated decimal in your formula if you don’t need a precise conversion.
    • It is more accurate to divide the subtracted difference by 1.8 instead of multiplying by 0.55, as it does not incur the loss of precision.
      This is because = = exactly.
    • Example 1: Divide by , which gives you 32.2—thus, 90°F is equal to 32.2°C, as above.
    • Example 2: Divide by , which gives you -20.5—thus, -5°F is equal to -20.5°C, as above.
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Calculator, Practice Problems, and Answers

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  • Question
    Confused! What is the 1.8 for?
    Janice Tieperman
    Community Answer
    The 1.8 in the Celsius to Fahrenheit formula is shorthand for the fraction 9/5 (since 9 divided by 5 equals 1.8). Converting the fraction to a decimal helps you complete the formula a bit more easily and quickly.
    Thanks! We're glad this was helpful.
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    Not Helpful 3 Helpful 5
  • Question
    How do you convert a negative Celsius temperature to Fahrenheit (like -32 degrees)?
    Janice Tieperman
    Community Answer
    You'd use the same formula as shown above! Using the C x 1.8 +32 formula, multiply -32 by 1.8 to get -57.6. Then, add 32, which gives you -25.6—so, -32°C equals -25.6°F.
    Thanks! We're glad this was helpful.
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  • Question
    How do you convert 25°C into Fahrenheit?
    Janice Tieperman
    Community Answer
    Plug 25 into the formula C x 1.8 + 32. Start by multiplying 25 by 1.8, which gives you 45. From there, add 32 and 45 together to get 77. Therefore, 25°C is 77°F.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
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      Conversion Table

      Celsius (°C) Fahrenheit (°F)
      -40 -40
      -30 -22
      -20 -4
      -10 14
      0 32
      20 68
      40 104
      60 140
      80 176
      100 212

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      References

      1. ↑ https://www.palmbeachstate.edu/prepmathlw/Documents/conversion.tables.n.formulas.pdf
      2. ↑ https://www.weather.gov/media/epz/wxcalc/tempConvert.pdf
      3. ↑ https://www.weather.gov/media/epz/wxcalc/tempConvert.pdf
      4. ↑ https://www.weather.gov/media/epz/wxcalc/tempConvert.pdf
      5. ↑ https://www.weather.gov/media/epz/wxcalc/tempConvert.pdf
      6. ↑ https://www.palmbeachstate.edu/prepmathlw/Documents/conversion.tables.n.formulas.pdf

      About This Article

      Article Summary X

      To convert Celsius to Fahrenheit, start by multiplying the Celsius temperature by 1.8. Then, add 32 to the product to get the degrees in Fahrenheit. For example, if you were trying to convert 20 degrees Celsius to Fahrenheit, first you'd multiply 20 by 1.8 to get 36. Then, you'd add 32 to 36 and get 68. Therefore, 20 degrees Celsius is equal to 68 degrees Fahrenheit. To learn how to convert Fahrenheit to Celsius, scroll down!

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