The old mulch calculator won't help me with this one. If I know I'm going to use 150 cubic yards of mulch and spread it at 1", how many square feet am I going to cover? Depending on which source I use as a mulch guide, I come up with different answers. I come up with anything from 25,000 sq ft up to 45,000 sq ft. I'm inclined to believe the 40,000 to 45,000 sq ft number - anyone have any thoughts on this?