Pipe Flow Calculator
Solve flow rate or velocity with continuity Q = V × A.
Everything is calculated in your browser. Nothing you enter is sent anywhere.
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Everything is calculated in your browser.
Pipe dimensions
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About the pipe flow calculator
Calculate volumetric flow rate or average velocity in a full, circular pipe using the continuity equation Q = V × A.
How it works
Enter the pipe inner diameter and either a target velocity or a known volumetric flow rate. Cross-sectional area A = π/4 × D² links velocity and flow rate. Results include m³/s, L/min, and GPM.
When to use it
Quick sizing sanity checks — verifying that a chosen pipe diameter gives a reasonable velocity for a given flow, or estimating flow from a measured velocity profile average.
Limitations
This tool implements steady, incompressible, fully-developed flow filling the entire cross-section. It does not model pressure drop, friction losses (Hazen-Williams, Darcy-Weisbach), roughness, fittings, or partially filled pipes. Do not use it for head-loss, pump selection, or hydraulic grade line work.
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All calculations run locally in your browser. Nothing you type is sent to a Dockzio server.
FAQ
Quick answers to common questions.
Learning Center
Guides related to Pipe Flow Calculator
Short explainers that pair well with this tool — concepts first, then practice.
- Pressure Units: PSI, Bar, Pascals, and Head7 min read→
- Pipe Sizing Basics: Flow, Velocity, and Diameter8 min read→