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A 14x14x20 inch box has a volume of about 2.3 (2.268519) cubic feet.
No box can have a volume of 81 ft because volume cannot be measured in feet.A box with a volume of 81 CUBIC feet could be 1 ft * 1.5 ft * 54 feet.
To find the volume in cubic feet, multiply the dimensions: 4 ft × 4 ft × 6 ft. This equals 96 cubic feet. Therefore, the volume is 96 cubic feet.
A cube thirteen feet to a side has a volume of 2197 cubic feet. A cube ten feet to a side has a volume of 1000 cubic feet. The larger cube has 1197 cubic feet, or 119.7 percent, more volume over the smaller one.
A volume would be expressed in cubic feet (ft3), not in feet.
To convert length, width, and depth into cubic feet, multiply the three dimensions together. For example, to convert dimensions in feet, the formula would be: Length (ft) x Width (ft) x Depth (ft) = Cubic Feet. This will give you the total volume of the object in cubic feet.
The units are not dimensionally equivalent. The first (1.25 sq ft) is area, which is 2 dimensional. The second (8 cubic feet) is volume, which is 3 dimensional. Now you could have a box, which has a 1.25 square foot base, and is 6.4 feet tall, and that box would have a volume of 8 cubic feet.
8 ft x 8 ft x 1 ft = 64 cubic feet
The volume is 55*12*18 cubic feet = 11880 cu ft.
If all the given dimensions are in feet then it is: 16*6*23 = 2208 cubic feet
As follows: cubic meters x 35.3147 = cubic feet
3 measurements are needed to calculate volume. IF your room has an 8 ft ceiling then it is approximately 800 cu ft.