The traditional jelly roll quilt (40 2.5" strips) is about 50x64. You can use more strips to make it larger. The funny/difficult thing about this quilt is that the final dimensions are controlled by the length of the first (very long) strip. You are always cutting the original strip in half, then half again, etc. and when you stop - that's the width of your quilt. The length may not be what you want, or what you expected, unless you do some calculations in the beginning.