BSE Toolbox
Pipe SizerDuct SizerSimultaneous DemandServices LayoutReference

The Building Services Engineer's Toolbox

Quick, transparent design checks

Every parameter that feeds a calculation is visible and editable, and results update live. No accounts, no black boxes.

Pipe SizerSize heating, chilled and domestic water pipeworkOpenDuct SizerSize rectangular or circular ductwork for an airflowOpenSimultaneous DemandSize domestic water pipes from an outlet scheduleOpenServices LayoutBetaProve services fit a ceiling void and export a scaled sectionOpenReferenceFluid properties, pipe schedules and roughness dataOpen
BSE Toolbox

Free calculation tools for building services engineers. Built by Richard Seaman, a building services engineer turned software developer; first released as an iOS app in 2017 and rebuilt for the web.

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Richard Seaman
Results are indicative and should be verified against project design criteria. Reference data per CIBSE Guide C.