How to Convert Celsius to Fahrenheit: Formula & Conversion Table (2024)

Co-authored byJoseph Quinonesand Janice Tieperman

Last Updated: July 24, 2023Fact Checked

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1. 1

   Use °F = (°C x 1.8) + 32 to convert Celsius to Fahrenheit. 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. 2

   Multiply the Celsius temperature by 1.8 to get started. 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. 3

   Add 32 to the multiplied product to get the temperature in Fahrenheit. 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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1. 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. 2

   Subtract 32 from the Fahrenheit temperature to begin. 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. 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.
See Also
Fahrenheit to Celsius conversion: °F to °C calculator

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