Practical tools for measured work
Pipe flow rate calculator
Calculate full circular-pipe volume flow, mean speed and mass flow.
Calculate the layout, check the diagram, then print the result for the shop or jobsite.
How it works
For a full circular pipe, area = πD²/4 and volume flow Q = Av. Mass flow is ρQ. Use inside diameter and cross-section-averaged speed. The US liquid gallon is exactly 0.003785411784 m³.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Solve for
- Volume flow rate
- Inside pipe diameter
- 100 mm
- Mean flow speed
- 2 m/s
- Fluid density
- 1000 kg/m³
Primary result: Volume flow rate: 0.01570796327 m³/s.
Before using the result
- Check the selected mode, units and input values before using the result.
- Read the assumptions and rounding rules; compare the worked example with your intended calculation.
- A numerical result does not supply missing context or change the stated limitations.
Limitations
This continuity calculation does not determine pressure loss, pump duty or pipe capacity from pressure. It assumes a full circular pipe and constant density. Partly filled channels and compressible flow require other models.
Frequently asked questions
Which conditions should I enter?
Use the actual temperature, pressure, material and geometry for your case. Each result uses the assumptions stated below; a numerical result alone does not validate those assumptions.
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