Converting from Fahrenheit to centigrade requires a complex formula, while converting from kilometers to miles is relatively easy--10 kilometers equals six miles.
Nope...
C = (F-32)/1.8
Conversely
F = (C*1.8)+32
Or, as a fast reference:
0 C = 32 F
5 C = 41 F
10 C = 50 F
15 C = 59 F
20 C = 68 F
...and so on.
P.S: 1 mi = 1,609.344 m = 1.609344 km