None.
A cubic [whatever] is a measure of volume while a foot is a measure of distance. The two measure different things and it makes no sense to try to convert from one to the other.
A hole 40 inches deep by 12 inches wide has a volume of: 2.62 cubic feet.
40 cubic feet = 1.481 cubic yards.
1 US quart = 0.0334201389 cubic feet 40 quarts X 0.0334201389 quarts/cubic foot = 1.3 cubic feet
40 liters is the same as 1.41 cubic feet (rounded).
A cubic yard is equivalent to 27 cubic feet. Since a standard 5-gallon bucket holds about 0.67 cubic feet of dirt, you would need approximately 40 buckets of dirt to equal one cubic yard. This is calculated by dividing 27 cubic feet by 0.67 cubic feet per bucket.
1 cubic yard = 27 cubic feet 1 cubic foot = 0.037 cubic yard (rounded)
Volume = 40*8*8.5 cubic feet = 2720 cubic feet
40 cubic feet equates to about 300 (299.221) US gallons of water.
1 cup = 0.25 quarts 64 cups x .25 = 16 quarts
One ton of coal is approximately equal to 40 cubic feet. Therefore, three tons of coal would require around 120 cubic feet of storage space.
10,800 cubic feet
5x4x2=40 cubic feet