Don't forget to include seam allowances in your measurements. Also, do you plan to use sashing or borders? If so you must also include these in your plans. I like to draw mine out on graph paper using the same scale for all measurements. This allows one to make sure your plans are in proper proportion. You can adjust sashing and border measurements if need be to obtain the correct size. I like to use Paint to draw my quilt and use colors to bring it to life as it should look when finished. If you need to cut more than one size block from a fabric be sure to plan before you cut. Careful planning will avoid wasting fabric.