how to measure package dimensions
Measure the width of the package with a measuring tape. Write down the width on paper. Measure the height of the package from the bottom to the top. Write this measurement down. Multiply the width and height by 2 and add this total to the length for the total measurement of your package.
For a rectangular prism, measure the length, width and height. The length is the longest dimension. 3. Use the following formula to calculate girth where W is the width and H is the height: Girth = 2(W + H) For example, if you had a box that measure 5 inches by 8 inches by 12 inches, 12 inches would be the length. Add 5 and 8 to get 13 and then multiply by 2 and you get 26 inches. This is the girth. Most shipping services charge extra to deliver unusually large packages.