How much area would 1 cubic yard of mulch spread 4 deep cover?

One cubic yard of mulch spread 4 inches deep would cover approximately 81 square feet. To calculate this, you can use the formula: Area = Volume / Depth. Since there are 12 inches in a foot, 4 inches is 1/3 of a foot, and therefore, 1 cubic yard (27 cubic feet) divided by 1/3 foot equals 81 square feet.