You need 2 things to begin with:
1) a unit of length: mm, cm, m, in, ft, miles, and so on.
2) what figure do you need to use to convert.
For example: 1 Centimetre = 0.39370 Inches
0.39370 x 5 = 1.9685 inches in 5 centimetres
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It depends on what you consider to be "customary" and what you wish to convert them to.
If you don't know their equivalence, then you can either get a common denominator, and compare the numerators. Or you can divide and convert them all to decimal form and then compare.
You can convert units of length to units of length, and units of area to units of area. But it doesn't make sense to convert between units of length and units of area.
It doesn't make sense to convert that. You can convert units of length to units of length, for example; but you can't convert a pure number to a length.
It doesn't make sense to convert that. You can only convert units of the same kind, e.g., units of length to units of length; units of area to units of area; units of time to units of time, etc.