volume of a pipe is pi * r * r *h
where pi=3.1412
r = half the dia of pipe
h= length of the pipe
make sure u take r and h in same units in this case keep it inches
so your answer is 3.1412 * 1 inch * 1 inch*12 inches(foot) = 37.6944 cubic inches
or 0.2617 cubic feet
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A pipe with an inside diameter of 2 inches has 37.7 cubic inches (rounded) of interior volume per foot. That means about 6feet 1.5inches per gallon.
Approx 21.2 cubic inches.
I'm assuming that "4 inch" is the inside diameter of your pipe.Then its volume is roughly-- 0.6528 gallon per foot-- 1.9584 gallon per yard-- 3.264 gallons per 5 feet.etc.
Assuming that 0.75 inch refers to the diameter, the volume is pi*(0.75/2)2*12 = 5.3 cubic inches, approx.
1/4 inch per foot.