Figuring shrinkage -
I know the formula for shrinkage is:
(Area before - minus area after) divided by area before
However - if one does not know which way a fabric/batting will shrink - in my experience, it usually shrinks more one way than the other -
Let's say that the end of the bolt says "5% shrinkage" - should I just assume that it will shrink 5% in both directions and base my cutting measurements on that?
Say I will need a piece of batting to be 80 x 100 after washing - and 5% shrinkage - should I cut it at least 84 x 105? (If I had 90 inch wide batting, I would probably cut it at width x 105 length)