Pipe Volume and Water Weight Calculator

Find how many gallons a pipe holds and how much that water weighs.

Estimate only. Use the real inside diameter. Nominal size is not the same as inside diameter, and it changes with pipe type and schedule.

Result

Fill in your numbers and hit Calculate.

Volume (cu in) = 3.1416 x (ID / 2)² x length(ft) x 12
Gallons = cubic inches / 231
Water weight = gallons x 8.34 lb

Example: 2 inch Schedule 40 steel has an inside diameter of about 2.067 in, so 100 ft holds about 17.4 gallons.