Oops, just realized that you asked how many circles you will need. I made my circles 7 and 3/4 inches (I used a salad plate as a template - very scientific!!) My quilt measures 52 x 62 inches and I used 120 circles. Hope this helps! Find a thrift shop that has a sale on and buy lots of jeans!! I really enjoyed working with the worn denim. It felt like handling my favourite pair of old jeans.