Gemm - 1 pound of quilting weight cotton fabric = approximately 3 to 4 yards of 45" wide fabric. With scraps that is the only way I've found to really get a ball park figure without driving yourself bonkers measuring all the small pieces. Close enough is good enough. : )
My LQS was doing a sale of scraps for $16/lb. However, they were also running a contest to see how much someone could pack into a jumbo (gallonish?) plastic bag for $25 a bag. I was able to get over 12 lbs into the bag by folding and rolling it all to take up Every. Single. Bit. of that bag.
OOPS! This is the fabric moratorium forum so my feat may not be the direction you want to head. I get competitive and it leads me astray.