Fixture units → size class.
The demo maps total WSFU to a service-size class the way published tables do — a starting point, not a finished design.
Free demo · Pipe sizing
Pipe size calculator.
Water supply fixture units in, service and main size class out — straight from published sizing tables. The demo gives the class; inside NectARM the calculator sizes every branch on the drawing.
Suggested size class
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Simplified class output from published sizing tables. Real sizing weighs run length, pressure loss, and each branch — that's the part inside the product.
What the class doesn't tell you.
Long runs, pressure loss, and mixed branch demand change real sizing. Inside the product the calculator weighs those per run.
Pair it with the other demos.
Count the units here, then check drainage on the slope calculator.
The full version
Real sizing happens on the drawing.
Fixture counts flow into branch sizing, sizing lands on the runs, and the takeoff counts what the drawing says — inside NectARM.