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Head loss in your pocket

Hydrocalc Plus

Hydrocalc Plus solves pressure loss in a pipe with Hazen-Williams: enter length, flow, diameter and material, add the fittings, and read the total head loss with the breakdown behind it. It works in SI and US units, and it also runs backwards — give it the loss you can afford and it returns the diameter or the flow.

One-time purchase · iOS and Android

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Hydrocalc Plus

In the app

  • Head loss by Hazen-Williams, with velocity, friction loss and minor losses separated
  • Materials catalog with its C values, and a fittings library you tap to add
  • Inverse mode: fix the head loss you can afford and it solves the required diameter, the maximum flow or the maximum length — iterating the minor losses for you
  • Results table listing every fitting, its quantity, K and contribution
  • SI and US units, switchable at any time
  • Export the calculation to PDF and save the project
Hydrocalc Plus

Add-on modules

Four separate one-time purchases. No subscription — buy only the one you need.

Pipe Database

Not a table to read — tap a pipe and it loads into the calculator: the real internal diameter (not the nominal size), its Hazen-Williams C for new or aged condition, and the material. Steel by schedule, PVC, HDPE and copper, plus pipes you define yourself.

Industrial Pack

Hazen-Williams only holds for water. This switches the calculation to Darcy-Weisbach, which accounts for density and viscosity, so oil, glycol, diesel or hot water come out right. 14 fluids with real properties, 11 roughness materials, and it reports Reynolds number, flow regime and friction factor.

System Curve

Turns your pipe data into a system curve, then overlays your pump from three catalog (Q, H) points and computes the operating point where the two meet — the flow and head the pump will actually run at. Exports to CSV.

Pump Power

Power required at the pump, in kW and HP, from P = (Q × H × ρ × g) / η. Flow and head loss come straight from the calculator; you add static head, efficiency and fluid density.

Prefer to try it first? HydroCalc Basic is the free version of this app.