I know how I do it, but am curious how others handle this situation. Measuring a square bed without any lpants is just simple math, but what about beds with irregular shapes and curves? Also, the density of the plants will have an effect. As plants grow (some) will cover more ground, and thus the bed will require less mulch. I know that we could spend a lot of time measuring each and every area, but it just seems to be much too time consuming. The way I do it, is to "visualize" how far a yard of mulch will cover, and "count" the number of yards. I've done this for so many years, I usually get pretty close. I am trying to train another person to do some mesurements, and am having a difficult time with the irregularly shaped beds with different quantities of plants.