I assume you want to find out how much water fits in the hose. Treat the hose as a cylinder - that should be a good approximation, even when you bend it. Measure the length and the interior diameter. Divide the diameter by 2 to get the radius. Convert everything to feet, and finally use the formula for a cylinder to get the volume.
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Volume of a hose in gallons =
(pi) x (1/2 the diameter of the hose in inches)2 x (length of the hose in inches) / 231