22.5
15 gallons = 0.07427 cubic yards (rounded)
1.851852 cubic yards
15'x37'x4" requires 6.85 cubic yards.
The formula I use is 15 tons = about 12 yards.
This area requires 3.7 cubic yards.
12*15*.33333= 60 cubic feet. 60 cubic feet/27 cubic feet per cubic yard = 2.222 cubic yards
14.8 cubic yards will work but round to 15 to be sure.
You would need approximately 2.5 cubic yards of gravel to cover a 12' by 15' area at a depth of 2 inches.
Multiply (acre-feet) by (1,613 and 1/3) to get (cubic yards). 3 acre-feet = 4,840 cubic yards. Multiply (cubic yards) by (0.00062) to get (acre-feet). 24,200 cubic yards = 15 acre-feet
A cube with side lengths of 15 yards has a volume of 3,375 cubic yards.
To convert the measurements to yards: 270 feet = 90 yards, 470 feet = 156.67 yards, and 15 feet = 5 yards. Multiply the three dimensions to find the volume in cubic yards: 90 yards x 156.67 yards x 5 yards = 70350 cubic yards of earth.