One cubic inch is about 0.00001638706 cubic meters.
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656.25 cubic inches is about 0.01075 cubic meters.
By "cbm" I'm assuming you mean, "cubic meters". First, you have to convert inches to meters. One inch = 0.0254 meters. So: 16 inches = 16 * 0.0254 meters 16 inches = 0.4064 meters 20 inches = 20 * 0.0254 meters 20 inches = 0.508 meters Now you use those numbers to calculate the volume of the drum in cubic meters: Volume = (pi * Radius^2) * Length (Note: ^ means to the power of) Length is 0.508 meters. Radius is 1/2 diameter, or 0.4064/2 = 0.2032. Volume = (pi * 0.2032^2) * 0.508 Volume = (3.14159 * 0.2032^2) * 0.508 Volume = (3.14159 * 0.04129) * 0.508 Volume = (0.129717) * 0.508 Volume = 0.065896 Answer: 0.065896 cubic meters or about 66/1000 of a cubic meter
Cubic meters and square meters aren't even the same kind of quantity.
Divide the number of cubic inches by (12 X 12 X 12), ie 1728.
1 cubic meter = 61,023.74 cubic inches. so multiply 8 by both sides 1 cubic meter * 8 = 61,023.74 * 8 8 cubic meters = 488, 189.92 cubic inches