[Tutor] program?

[Jacques]

I dont know if you would call this a program. Please let me know if it 
qualifies to be a program. I just started with python and started 
programming. So, please bare with me.
 >>> # Perimeter of a rectangle equals sum of width times two, plus sum 
of lenth times 2.
 >>> width = 8 #inches
 >>> length = 1 #foot
 >>> (width * 2) + (length * 2)
18
 >>> # answer is incorrect, because inches and feet are not same unit.

How would I be able to fix that?