Flow Rate Pipe Calculator Pro

Offline pipe flow — diameter, pressure, flow rate.

FLOW is an offline pipe flow rate calculator for water in round, full pipes. Size a run from inner diameter, length, and material — or invert a frictional pressure drop to estimate flow. No live hardware, leak sensor, or “system online” dashboard.

What you can calculate

• Continuity: Q = A·v (flow from velocity or velocity from flow)
• Darcy–Weisbach head loss with a Churchill friction-factor approximation and a commercial roughness table
• Hazen–Williams (water) as a comparison method
• Reynolds number and laminar / transitional / turbulent band
• Velocity warnings when the mean speed is low, high, or excessive
• Unit toggles: L/min, m³/h, GPM · mm/inch · bar/psi/kPa · m/ft

Save named scenarios on the device and share a text summary. Charts are educational plots of the current inputs — not 24-hour telemetry.

FLOW Pro (pro.yearly, about €6.99 per year via Google Play Billing)

• Unlimited saved scenarios (free tier keeps 3)
• Custom roughness ε and Hazen–Williams C
• Extra materials and Darcy vs Hazen comparison
• Share/export and educational charts

The core calculator stays free. Pro renews yearly until you cancel in Google Play.

Educational disclaimer

Results are estimates for straight circular water pipes. They omit fittings, elevation, pumps, and code tables. FLOW is not a licensed plumbing or engineering stamp.

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Publisher: LineSpotting · package com.flowratepipecalculatorpro