It would obviously depend on how thickly you wanted to cover the surface, and how 'tall' a single unit of pea gravel was.
You would need 736 bags per foot depth.
None. Cubic feet are a volume unit which has nothing to do with a two-dimensional area of a square mile. You need a third dimension for a cubic measurement.
cubic meter are found in
1 cubic foot of aluminum weighs 169.344 Lbs
One square foot is 144 square inches, so if you cover that with an inch of water you'll need 144 cubic inches. One gallon is 231 cubic inches. Dividing 231 by 144 = 0.62 gallons. So a plant growing in about 1 square foot of soil needs a bit more than half a gallon of water a week to equal 1 inch. A 4 ft x 8 ft bed = 32 sq. ft. so at 0.62 gal/sq.ft. you'd want to give it about 20 gallons of water a week.
The surface area of the cube is 150 square meters.
A cubic yard of gravel will cover 81 square feet at 4" of thickness. Multiply the width of the patio by the length of the patio to get your square footage. Gravel is usually sold by the cubic yard.
2.924
744 Square Feet
It depends how thick the gravel is being laid - at 4 inches thick, a cubic yard will cover 81 square feet.
Approx 70.6 square feet.
1 cubic yard equals 27 cubic feet. At a six inch depth 1 cubic foot will cover 2 square feet, so 27 cubic feet will cover 54 square feet.
9.26 cubic yards for every inch of depth.
Ten cubic feet will do the job!
92.593 cubic yards for every inch deep.
You will need about 3.7 cubic yards (around 4.75 tons) of gravel.
You'll need about 28.704 cubic yards (37 tons) of gravel.
Plan on about 2.2 cubic yards (2.8 tons) of gravel.