If you have fabric that was upstairs, or buy new fabric, Stack some fabric on a table (ten yards), measure the sq. inches of that stack, then get the sq. inch of the container. Divide the container Sq. inch by the fabric stack sq. inch number.
If your stack has ten yards...then 10 times $12 per yard -= $120, times the number of stacks that can fit in the container. Hope this is clear.
D in TX