Plumbing Calculators

Our plumbing calculators help you size pipes correctly for water supply, central heating and combined systems. Whether you are running new pipework for a bathroom, kitchen extension, or full re-plumb, these tools take the guesswork out of pipe selection.

Each calculator factors in flow rate, pipe run length, available pressure and pipe material to recommend the right diameter — helping you avoid poor flow, noisy pipes, or wasted money on oversized pipework.