design calculator — making compliance easy

Job conditions in.
Build spec out.

Enter what's on site and get the pipe sizes, gutter dimensions and configuration you need to build. Every calculation is worked within the Australian Standards.

A (meter) BC MAIN RUN Continuous HWSD Ducted heaterE CooktopF 2 m115 MJ/h25mm 5 m45 MJ/h20mm 12 m345 MJ/h40mm 4 m230 MJ/h32mm 9 m185 MJ/h32mm

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Saved jobs

Jobs you've saved part-way through, so you can pick them up later. Tap Save for later on any step of a calculator to save one. You can keep 2 of each calculator — saving a third replaces the oldest. Finished jobs don't need saving: print them to PDF. Saved on this device and browser.

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Your details

These go on the top of every PDF you print from the calculators, so the document looks like yours. Leave them blank and the PDF shows Plumbing Calculator placeholder details instead. Saved on this device and browser.

HOW IT LOOKS ON THE PDF
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Gas pipe sizing

Visual pipe network builder. Preview screen only — tree editing and calculation engine not yet connected.

PREVIEW — layout only, not yet calculating against verified standards data
1 Fuel type
Natural gas
LPG
2 Pressure
3 Pipe material
4 Main run
This is the run the calculation critical path is measured along — every other unit branches off it.
5 Additional units
Total connected load — MJ/h

Network preview

Simple layout for now — branch-off-a-branch and drag-to-reposition come once this basic flow feels right.

LABELED DIAGRAM — A is always the meter, B, C, D... run straight through the longest run, E, F... are the branches off each tee, in order
PIPE SIZING — sizes below are placeholders, not real
Total connected load— MJ/h
Main run (meter → end unit)25mm copper (example)
Each branch20mm copper (example)
Waiting on verified AS/NZS 5601.1:2022 data before real pipe sizes can be shown here. 20mm and 25mm copper shown as placeholders since they're the most common sizes on a typical run.