I have a book - "The Quilter's Pocket Reference" that has sooo much useful information. I would highly recommend this for answering so many questions. Bought it about 10 years ago in my LQS for $8. Gives yardage equivalents; standard bed/batting sizes with sample quilt sizes; yardage and layout options for backing; calculations for all kinds of cuts; binding measurements; reduction/enlargement charts, etc. Great tool to take on shopping trips.