I write lots of patterns for the quilting site. Some are for entire quilts (or other projects) and some are quilt block patterns.
Quilters use block patterns to organize swaps among friends. Others choose blocks of the same size (or quilt blocks that will work together when grouped) to make a sampler quilt. Blocks are perfect for scrap quilts, too, when you're looking for ways to use leftover pieces of fabric from other projects.
But I receive lots of questions asking how to calculate yardage for an entire quilt made from a specific block, and there's no simple answer to that question... it depends. How large must the quilt be? How many quilt blocks are needed? Will the blocks be straight-set or on point? Do you prefer to work with blocks that are separated by sashing? How about borders?
The first time you figure quilt yardage it might seem a bit confusing, but work through the process in a step by step manner and you'll discover that it really isn't a difficult task.