I say 1.09 cu ft.
1.963 cubic feet
Three acres three inches deep is 403.33 cubic yards.
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
Assuming it is round, (1) convert all measurements to feet. (2) Use the formula for the volume of a cylinder to get the volume in cubic feet. (3) Convert from cubic feet to gallons. As an alternative, you can also convert all measurements to inches, and in the final step, convert from cubic inches to gallons.
3,456 cubic yd.
1.963 cubic feet
A hole 40 inches deep by 12 inches wide has a volume of: 2.62 cubic feet.
The volume of an area 24 feet round and 45 inches deep is: 1,700 cubic feet.
Three acres three inches deep is 403.33 cubic yards.
328,320 cubic inches
It depends upon how deep you want it filled. For example, if you want it filled 6" deep, then the cubic feet would be 175 sq. ft X 0.5 ft. = 87.5 cubic feet. 87.5 cubic feet / 5 cubic feet/bag = 17.5 bags
600mm into cubic meter
62/3 cubic yards for every 1-foot deep. 5 cubic yards for every 9-inches deep. 31/3 cubic yards for every 6-inches deep. 5/9 cubic yard for every 1-inch deep.
About 8.5 (Pi*(6/12)^2*290)/27
If it is 4 inches deep/thick, 2 cubic yards. If it is 6 inches deep/thick, 3 cubic yards.
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
Not possible to convert between a length unit and a volume unit.