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70 sq feet x 18 inches deep is easiest to calculate if all units are in feet. 18 inches is 1.5 feet deep. Volume is calculated using length x width x depth. Length and width are already factored in so all we need to do is multiply area by depth to get volume. 70 sq. feet x 1.5 feet deep equals 105 cubic feet. If you need measurement in cubic yards (i.e. when having soil delivered on a truck) you need to divide your cubic feet by by 27 cubic feet per yard to arrive at cubic yardage. A yard is 3 feet long so 3 ft. x 3 ft. x 3 ft. equals 27. Therefore 105 cu. ft. / 27 equals 3.9 yards.
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How much dirt is needed to fill 36 sq foot box 12 inches deep?
1 foot by 36 sq feet = 36 cubic feet of dirt is needed
How many yards of dirt would it take to fill an area 8 foot long by 4 foot wide and 5 foot deep?
I think 17 or maybe 38
How many yard of dirt do you need to fill a garden that is 4 foot wide and 16 foot long and 12 inches deep?
2.37 cubic yards.
How many yards of dirt would it take to fill an area of 747 square feet?
You are mixing volume (square yard) and area (length x width). How deep do you want the dirt? One foot deep you need about 80 square yards of dirt.
How many tons of rock is needed to fill a 18 foot wide by 12 inches deep area?
.15
