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You cannot calculate cubic feet from only two measurements. Cubic feet is an area of volume, such as the inside area of a box. With only two measurements you get square feet, which is a measurement of area. A box 11 feet by 21 feet takes up an area of 231 square feet (11 times 21). If the box is 3 feet tall, then you can compute cubic feet since you take all three values and multiply them together. A box 11 feet by 21 feet by 3 feet would contain 693 cubic feet of space (11 times 21 times 3).
Multiply 21 inches by 14 inches by 10 inches to get 2940 cubic inches. There are 12 inches in a foot, so there are 12^3=1728 cubic inches in a cubic foot. Divide 2940 cubic inches by 1728 cubic inches per cubic foot to get about 1.7 cubic feet.
Alternatively, first convert all measurements to feet. 21 inches is 1 3/4 feet, 14 inches is 1 1/6 feet, 10 inches is 5/6 feet. Multiply them together to get 245/144 cubic feet, which again is about 1.7 cubic feet.
It's always nice when doing a problem two different ways gives the same answer.
Normally the first two numbers in the model number are the cubic feet. You have posted 2 model numbers, on appears to be 21 cubic feet and the other is 17 cubic feet.
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