Substract 32 from the Fahrenheit reading and divide the result by 1,8.
Example: 212°F minus 32 = 180°F
180°F / 1,8 = 100°C
Origin of the Fahrenheit scale is from temperature that cattle can survive outside.
0 deg to 100 deg. Not very scientific...
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Celsius to Fahrenheit · Multiply by 9 · Divide by 5 · Add 32 Fahrenheit to Celsius · Subtract 32 · Divide by 9 · Multiply by 5