Plumbing Calculators

Free calculators for plumbing projects. Size water heaters, pipes, drains, and sump pumps. Verify water pressure and fixture unit loads.

Size a tank or tankless water heater based on household demand.

Calculate the right water supply pipe diameter for your flow rate needs.

Calculate the required fall for drain pipes based on pipe size and run length.

Calculate the required GPM and horsepower for a sump pump.

Calculate total drainage fixture units to size drain and vent pipes.

Calculate pressure loss through pipe runs to verify adequate fixture pressure.