A square foot is a measure of area in 2-dimensional space while a yard is a m
easure of length in 1-dimensional space
. A yard is also used (in the building trade) as a short form for cubic yard which is a measure of volume in 3-dimensional space. In any case, t
hey measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
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A "yard of gravel" is a measure of volume, not a measure of area. There are 27 cubic feet (3x3x3 feet) in a yard of gravel, or one cubic yard.
It depends how thick the gravel is being laid - at 4 inches thick, a cubic yard will cover 81 square feet.
1 square foot = 144 square inches, so 100 square ft = 14400 sq inches. Multiply be 3 = 43200 cubic inches. I believe gravel is normally sold by the cubic yard. 1 cubic yard = (36 in)3 = 46656 cubic inches. So 43200/46656 = 0.926 cubic yards
One cubic yard of gravel typically occupies a space of about 27 cubic feet. When piled, it generally forms a mound that's about 3 feet high and covers an area of roughly 9 square feet, depending on the shape and compaction of the pile. The exact dimensions can vary based on the size and shape of the gravel particles.
1 yard = 3 feet 1 square yard = 9 square feet 3 square yards = 27 square feet