I confess I didn't read every post so I apologize if this has been mentioned: there is an App available for Apple products and Androids called the quilting Block Tool. It's $3.99. It has 100 blocks completely broken down with cutting instructions sizing the blocks for example the Ohio Star from 3" block up to a 15" block. It is easy to figure an 1&" or 21" based on the other measurements. For those who focus on block construction it is a good $4 investment.