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Convert Fahrenheit to Centigrade and Back In Your Head

As a shortcut, F=degrees Fahrenheit and C=degrees Centigrade (or Celsius).
The basic conversion is exact:
Degrees F = (Degrees C * 9/5) + 32 and
Degrees C = (Degrees F - 32) * 5/9

F to C
1. Subtract 32 from F
2. Halve the result
3. Add back 10% of the result
4. Done, you have C.

Example:
Start: F = 57
Minus 32: F-32 = 25
Halve it: 25/2 = 12.5
Add back 1/10: 12.5 + 1.3 = 13.8 or 14C
C to F
1. Double C
2. Subtract 1/10 of the result
3. Add 32
4. Done, you have F.

Example
Start: C=32
Double it: C*2 = 64
Subtract 1/10: 64-6 = 58
Add 32: 58+32 = 90F

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ftoctof.txt · Last modified: 2020.12.29 09:38 by Steve Isenberg