My master gardener wife has had me building yet another new flower bed where a tree had to be removed. Lots of fun digging through tree roots to put the sprinkler head in there.
It is 72 inches x 76 inches but there is a slope. It is 17 inches at the low end and just 7 inches at the top. That is filling it with a 2 or 3 inches of the top.
There is some construction debris and the new sprinkler head in there, but we can ignore that. It will be out of the way on the bottom.
We can go to a local (4 miles away) place that sells great "rich mix" soil by the front end loader scoop. They are pretty good at guessing a lesser load, and I know I don't need a full pickup bed load. A friend will let me use his long bed pickup, and we will have the fun of shoveling it all out into a wheel barrow to dump into the flower bed.
So how much soil (not dirt!) do we need to buy?