I've recently started to create quilt block pattern calculators again. They can be found at www.myquiltgenie.com.
I started making them in 2008 mostly for myself to resize quilt blocks and layouts and have the instructions be changed accordingly. I can't tell you how many times I've had to re-figure the math on a quilt I'd let set too long.
The calculators are block and quilt layout specific so you don't have to do much more than choose a finished size and how many blocks you want to make. Once done you don't even have to remember how to put the blocks together or in the case of quilt layouts, figure out how much border, backing, backing and binding you'll need to finish.