If a calculation of volume in cubic inches is needed, all dimensions need to be converted to inches before calculating the volume. For example, if calculating a rectangular prism in cubic inches, the dimensions need to be converted to inches, then the volume is calculated as length times width times height.
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You cannot convert cubic inches to inches. Cubic inches are units of volume and inches are units of length.
The ratio of 125 cubic inches to 125 cubic inches is 1.
Volume = Height x Length x Width 91 inches x 112 inches x 60 inches = 611,520 cubic inches. This large a volume is usually converted to cubic feet or cubic yards. 611520 cubic inches = 611520/1728 cubic feet = 353.89 cubic feet 611520 cubic inches = 611520/46656 cubic yards = 13.1 cubic yards
To calculate the capacity of a pipe you need to first calculate the area and volume. So assuming your pipe has an inside dimension (ID) of 3 inches, you would use the following equation. πR2 = area πR2xH = volume π=3.1416 Using inches as our unit R (radius) = half the diameter = 1.5 inches H (height or length of pipe) = one foot of pipe = 12 inches Gives you the volume in cubic inches 1728 cubic inches per cubic foot (12x12x12) One cubic foot = 7.48 US gallons (RxR)x3.1416x12 (1.5x1.5)x3.1416x12 = 84.82 cubic inches 84.82/1728=.049 cubic feet .049 cubic feet x 7.48 US gallons per cubic foot = 0.36652 US gallons per foot of 3" ID pipe.
You can convert between feet and inches, or between cubic feet and cubic inches. You can not convert between cubic feet and inches.