Plumbing calculators
14 calculators across 4 pillars. Every one runs entirely in your browser — nothing you type is transmitted anywhere — and every code table behind them names its section and edition.
Sizing and flow
5 calculatorsPipe size calculatorSize a water supply run from fixture units, developed length and available pressure.1/2"–2" · IPC 604Drain slope calculatorFall over a run at 1/8, 1/4 and 1/2 inch per foot, with the code minimum for the size.1-1/4"–8" · IPC 704Fixture unit calculatorTotal WSFU and DFU for a fixture list, both codes side by side.WSFU · DFUGas pipe size calculatorSchedule 40 and CSST sizing by BTU load and longest length.NFPA 54 · in. w.c.Water pressure calculatorStatic head, elevation loss and friction loss to a PSI at the fixture.PSI · ft head
Costs and estimating
4 calculatorsWater heater cost calculatorTank size, fuel, permit and haul-away into one installed band.40–80 gal · USDRepipe cost calculatorFixtures, stories and material into labour hours and a material band.PEX · CPVC · CuPlumbing invoice templateEditable, printable invoice with line items, tax and terms.Print · CopyJob price calculatorFlat-rate build-up from labour rate, material, overhead and margin.Flat rate · %
Code and permits
3 calculatorsVent distance calculatorMaximum trap arm length by size, with the fall check that fails most inspections.IPC 906.1Expansion tank calculatorTank volume from heater capacity, temperature rise and supply pressure.gal · PSIPermit checklist builderScope in, printable list of drawings, forms and inspections out.Print · Edit
Fixtures and repairs
2 calculatorsKeep the code book handy.
Bookmark the calculator you reach for most. It will be there on the next callout, with the table it reads from named on the page.
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