Knowledge Hub

Tools & calculators

Calculate, look up, decide

Practical sizing and lookup tools built to BS EN 1717 and WRAS guidance. Enter your supply conditions and get a recommendation with the supporting regulation citation.

Water usage calculator

Estimate peak and average daily water demand for a building type or specific outlet cluster.

Valve selector tool

Answer five questions about installation type, fluid category and pressure to receive a recommended valve.

Air gap sizing tool

Determine minimum Type A and Type B air gap dimensions per BS EN 1717.

Pipe size converter

Convert between DN, nominal bore, BSP thread sizes and common UK pipe materials.

Flow rate calculator

Enter pipe diameter and flow velocity to determine volumetric flow rate and recommended valve size.

Using these tools

Indicative results until engineering sign-off. Always confirm against the current Water Fittings Regulations and manufacturer data.