How much top soil for a 100 yard by 75 yard lawn?

This is totally relevant on he depth of topsoil spread over the entire 7500 sq. yd. area.

Typically a landscape area of that size for a standard parcel of lawn would be an average of 4" depth of clean rock free top soil. that would be figured with the following formula: width x length x depth. since 4" is 1/9th of a yard it would be calculated like this: 75x100 = 7500 square yards divided by 9 = 833 cubic yards of topsoil at a depth of 4 inches.

I gave you the formula so that anyone using this site can adjust the dimensions to get the proper results.