I have been to several sites, checking out the "correct" way to figure mulch and I am still having trouble agreeing with the number I am getting. I measured all of the beds and figured the square footage 6,025. The customer requested 3" coverage. I am coming up with approx 56 yds, what is the best method for figuring amounts. (Other than the obvious, which is experience!) I'll get that in time. I plan to add $3 dollars per yard delivery, and double the total per yd for the installed price.