Take one of the formulas you use to convert one to the other.
Let's say, take the formula used to convert °C to °F :
F = 1.8 C + 32.
Since we want the °F and °C numbers to be equal, we can replace
the 'F' on the left side with 'C':
C = 1.8 C + 32
Subtract 32 from each side:
C - 32 = 1.8 C
Subtract C from each side:
-32 = 0.8 C
Divide each side by 0.8 :
-32/0.8 = C = -40
That's the number to remember:
-40°F = -40°C
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To convert Fahrenheit to Celsius, you can use the formula: (Fahrenheit - 32) * 5/9 = Celsius. To find when Fahrenheit equals Celsius, you set the two values equal to each other and solve for the variable.
45 degrees Celsius is equal to 113 degrees Fahrenheit. You can convert Celsius to Fahrenheit by multiplying the Celsius temperature by 1.8 and then adding 32.
-65 degrees Celsius is equal to -85 degrees Fahrenheit.
46 degrees Celsius is equal to 114.8 degrees Fahrenheit.
180 degrees Fahrenheit is equal to 82.2 degrees Celsius.
90 degrees Fahrenheit is equal to 32.3 degrees Celsius.