You get the weight of wool (by taking a yard of the material "doublewide" (approx 56" to 60") and weighing it. That gives you the material weight. I'm not sure how else you can get the weight without weighing it... aside from just feeling it and giving a guess.

We (USAKilts) use different weights and types of material. Our most popular material is our PV (Poly Viscose). I do not know the actual weight of the material, but I'd be willing to give an educated guess at about 11 OZ.

I hope this helps.