Plumbing Tools and Calculators
Quick calculators for the numbers that come up in real jobs: pressure, flow, pipe volume and how big a heater or softener needs to be.
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Water pressure converter
Bar, psi, kPa and feet of head, with a plain reading of what your mains pressure means.
Open the calculatorWater heater size calculator
First-hour rating for a tank heater, or flow and power for a tankless one.
Open the calculatorWater softener size calculator
Grains per day from household size and hardness, and the softener size to buy.
Open the calculatorPipe volume calculator
Water held in copper, PEX or PVC pipe, and how long you wait for hot water.
Open the calculatorFlow rate calculator
A timed bucket test turned into gallons or litres per minute, checked against shower limits.
Open the calculatorEvery calculator runs in your browser; nothing you type is sent anywhere. Each page explains the formula behind the result and where the figures come from.