You don’t have to measure, weigh, or calculate anything! We can do all of that for you here at our E-Boutique. Dimensional weight uses an estimated weight that is calculated from the length, width and height of a package. If you want to ship a 5 lb. parcel of books and another 5 lb. parcel of ping pong balls, the latter will take a disproportionate amount of space compared to the former one. The shipping fee of your package is based upon the greater of the dimensional weight or the actual weight.Consequently, carefully consider the size of the box that your package will be shipped in, if that is something you can control on your end. You can use this free online tool: Dim Weight.