Pipe-flow and pumping pressure
Diameter alone does not determine flow capacity; pressure, elevation, length and fittings affect the design.
Plumbing tools & calculators
4 tools to prepare measurements, estimate quantities and plan your next conversation with a trade professional.
Plumbing
Fall & gradient
Calculate vertical fall from a run and an entered gradient.
Open calculator PlumbingRainwater event capture
Estimate roof runoff from one rainfall event and available tank storage.
Open calculator PlumbingPipe water volume
Estimate water held in a straight pipe using its internal diameter.
Open calculator PlumbingFlow & water-use budget
Convert a measured flow rate and use duration into litres and water cost.
Open calculatorPrepare your measurements
Use measured catchment, internal pipe dimensions, actual flow or specified gradients. Keep rainfall depth, flow rate and stored volume distinct.
Confirm before you commit
Discuss plumbing connections, drainage capacity, water quality and the required design with a licensed plumber.
YourHome rainwater guidanceSpecialist resources
Australian rainwater system planning
Tank sizing needs rainfall patterns, demand and storage modelling; a single-event calculator is only a starting point.
Sanitary facilities and hydraulic compliance
Occupancy and applicable building requirements affect fixture counts and drainage design.
Hot-water system selection
Household demand, climate, system efficiency and installation constraints affect system selection.