The "Finished Size" is usually 6" shorter on each side or can be up to 2% smaller than the "cut size. " For example, a 10' x 20' tarp has a Finished Size of 9' 6" x 19' 6. 6' x 10' cut size = 5'6" x 9'6" finished size 12' x 30' cut size = 11'6" x 29'4" finished size 6' x 20' cut size = 5'6" x 19'6" finished size 12' x 40' cut size = 11'6" x 39'4" finished size 6' x 30' cut size = 5'6" x 29'6" finished size 14' x 20' cut size = 13'6" x 19'6" finished size 7' x 10' cut size = 6'6" x 9'6" finished size 14' x 30' cut size = 13'6" x 29'4" finished size 7' x 20' cut size = 6'6" x 19'6" finished size 15' x 20' cut size = 14'6" x 19'6" finished size 8' x 10' cut size = 7'6" x 9'6" finished size 15' x 30' cut size = 14'6" x 29'4" finished size 8' x 20' cut size = 7'6" x 19'6" finished size 16' x 20' cut size = 15'6" x 19'6" finished size 10' x 10' cut size = 9'6" x 9'6" finished size 18' x 24' cut size = 17'6" x 23'4" finished size 10' x 12' cut size = 9'6" x 11'6" finished size 20' x 20' cut size = 19'6" x 19'6" finished size 10' x 15' cut size = 9'6" x 14'6" finished size 20' x 24' cut size = 19'6" x 23'4" finished size 10' x 16' cut size = 9'6" x 15'6" finished size 20' x 30' cut size = 19'6" x 29'4" finished size 10' x 20' cut size = 9'6" x 19'6" finished size 20' x 40' cut size = 19'6" x 39'4" finished size 10' x 30' cut size = 9'6" x 29'4" finished size 24' x 24' cut size = 23'4" x 23'4" finished size.