Pipe Volume Calculator

Nominal pipe size is a name rather than a measurement: one inch schedule 40 has a bore of 1.049 inches, one inch schedule 80 has 0.957, and one inch type M copper has 1.055. Pick the size the pipe is sold as and the bore comes from the published wall schedule, giving the volume in gallons and litres, the gallons per foot, and the weight of water in the line. A second mode takes a measured outside diameter and wall thickness for anything non-standard, and a third gives the velocity and the time to fill or flush the run at a chosen flow rate. Bores are the nominal published figures, so mill tolerance and scale in an older line will move them slightly.