1 yard = 3 feet
1 squared yard = 3 square feet
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100,000,000,000
depends on the depth that you need to cover the 1200 square feet (area) to. there are 3 foot to 1 yard (1 foot=3 yards). so 1 square foot = 9 square yards (3x3). 1200 square feet = 1200 x9 = 10,800 square yards. you then multiply the 10,800 by the amount of yards (depth) that you want to cover the area to.
Based on sand and gravel calculator found on L.R. Faulk Construction Co. site, 1 ton of gravel (clean rock) will equal approximately 7.3 sq. ft x 6 inches deep, or 5.2 sq. ft x 3 inches deep. A ton of gravel will cover approximately 15 square yards (135 square feet) at 3 inches deep.
100
First you have to know how many cubic yards are in 10 tons, just ask the company your buying the material from, they know as they do this all year long. pea gravel, road base, and sand will all cover at a different rate because of the size of the material. one cubic yard of material is 3ft x3ft x3ft or 27 cubic feet If you spread 3 inches deep the one yard will cover , on average, 108 square feet surface area. At 2 inches deep one cubic yard will cover approx 162 square ft of surface aera. chet2010