Originally Posted by
Hamish
Find a box or some sort of square container (makes it easier) that is at least 1000 cubic inches. That is only a 10 inch square box. Weight out exactly 1 oz of down, compress it briefly, and then let it sit for 24 hours. Then measure how many inches of material you have. For example, if you have a box that is 6 inches long, 8 inches wide, and 14 inches tall and 1 ounce only fills 9 inches. Then it's 6 x 8 x 9 = 432. Since it was exactly 1 ounce of down, you know for sure that the fill power is 432. Hope this helps and good luck with the quilt. I too am working in a similar project using salvaged down of unknown fill power.
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