Pipe Sizing Without the Chart Paper
FlowSpec Sizer turns friction-loss tables into an interactive model. Build a pipe run, set the flow, and get the exact diameter and pressure drop — in seconds, on device, no account needed.
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Illustrative marketing figures; not App Store metrics.
The Workbench
Run Builder
Assemble a pipe run segment by segment—straights, elbows, tees, valves, unions—each with real dimensions. See total equivalent length and live pressure loss instantly.
Hazen-Williams Solver
Input flow rate or fixture units, choose the C-factor for your material, and get friction loss, velocity, and pass/warn flags—all calculated locally.
Sizing Assistant
Target your flow and maximum allowable drop; the app returns the smallest compliant pipe size with a clear reasoning line you can trust.
Demand Estimator
Check off from 40 preloaded fixtures—toilets, showers, sinks, appliances—get a fixture-unit curve, and apply it directly to your run.
Pump Head Calculator
Compute total dynamic head from static lift, friction loss, and discharge pressure, with a velocity check on the pump inlet.
Exportable Job Sheet
Save and duplicate runs, annotate notes, and export a one-page PDF with diagram, inputs, and results—ready for the client or your own file.
See It in Action
Built for the Trades
FlowSpec Sizer is a purpose-built workbench for plumbers, irrigation pros, and serious DIYers who are done flipping through worn-out code tables. Instead of interpolating between columns, you assemble your pipe run from real lengths and fittings, choose PEX, copper, PVC, CPVC, or galvanized steel, and watch pressure loss, velocity, and head loss update live. The app bundles a complete local library of material specs, fitting equivalent lengths, and fixture units, plus calculators for pump head, hot-water recirculation, and demand estimation. Every project saves on your device, exports as a clean one-page PDF, and works when the job site is offline. No ads, no accounts, no placeholders—just the math you trust, laid out the way a pro thinks.
Ready to Get Started?
Download FlowSpec Sizer from the App Store, or contact support with any questions.
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