If it happens to be a hollow rectangular container with those dimensions, then
it can accommodate 11,880 cubic feet, or 440 cubic yards, or 8,845.7 gallons
of cargo inside.
It is: 55*12*18 = 11,880 cubic feet
If you fill it to the brim, it would be 55 x 12 x 18 = 11880 cubic feet
12 swg current carrying capacity
The volume is 55*12*18 cubic feet = 11880 cu ft.
55' x 12' x 18' = 11,880 cubic feet = 440 cubic yards
Around 12-13 cubic feet
This question cannot be answered because there are no units for the measurements. It should be obvious to anybody that a capacity of a container which is 12 inches by 12 inches by 31 inches will be very different from that for one which is 12 feet by 12 feet by 31 feet, for example.
It is not possible to calculate the capacity in cubic yards when only two of the three relevant measures (length, width and height) are given. Assuming the two given numbers are the length and width, the capacity depends on the stack - which could be microscopically thin, or several miles high!
Capacity = 55 ft * 12 ft * 18 ft = 55/3 * 12/3 * 18/3 cubic yards = 55*4*2 = 440 cubic yards.
You calculate square feet by muliplying the length of something by its width. for example a room 12 feet long by 9 feet wide would have an area of 12 x 9 square feet, which is 108 square feet.
80 x 80 x 12
The cubic capacity of a cylinder with inside dimensions of 8 ft diameter and 12 ft height is: Pi/4 x D2 x H = 0.785398*8*8*12 = 603.186 cubic feet (to nearest thousandth). or 192*Pi