You gotta remember to convert your inches (depth) to feet or the math will be all wrong.
Inches to feet conversions:
1"divided by 12" = .08
2"= .17
3"= .25
4" = .33
Always remember to do LengthxWidthxDepth to find your cubic feet. As stated above, there are 27 cubic feet in a yard so...take your cubic feet and divide it by 27 to get your cubic yards needed. It's really quite simple once you get the hang of it.
1 cubic yard will cover:
324 sq. ft at 1" depth
162 at 2"
108 at 3"
81 sq ft. At 4"
Once you remember those numbers you can estimate faster and without a calculator.
