Originally Posted by SandyinZ4
I, too am looking forward to seeing this answer. Sometimes I get a tablerunner pattern that is over 30 inche long and I wish I could downsize it to ake a shorter one. Wonder if there is a formula for all of this type of questions?
The formula is to take the seam allowances off the original size of the pieces and then multiply those sizes by the amount you want the percentage of the original piece you want it. So if you have a pattern that is 100 x 100 and you want it 80 x 80, you want it to be 80% of the original size.
The problem is that these sizes don't always convert to nice even numbers. Ideally you'd try to find measurements that are easy to deal with.