HowMuchFabric is primarily aimed at quilters who like to design, but would prefer doing as little math as possible.
The math is done for you! Save the report as a PDF, or print it and take it to the fabric store with you.
Note: The generated fabric requirements leave VERY little room for cutting error. If you think you need more fabric to allow for the way you usually cut, you will need to add a bit to the reported fabric requirement.
Note: Now requires OS X 10.11 or later