Science
Reynolds number
Compare inertial effects with viscous effects using density, mean speed, characteristic length and dynamic viscosity to obtain a dimensionless Reynolds number.
Calculators / Science / Pipe flow rate
Pipe flow rate calculator
Multiply the internal cross-sectional area of a circular pipe by mean fluid speed to find volume flow per second and per minute.
On this page
Volume flow3.93e-3m³/s
Volume flow235.62L/min
Calculator controls
How to calculate
Multiply the internal cross-sectional area of a circular pipe by mean fluid speed to find volume flow per second and per minute.
Volume flow = pi*(d/1000)^2*v/4 m³/s; Volume flow = pi*(d/1000)^2*v/4*60000 L/min
Worked example
Internal pipe diameter (mm): 50; Mean flow speed (m/s): 2.
Volume flow: 3.93e-3 m³/s; Volume flow: 235.62 L/min.
Assumptions and limits
Multiply the internal cross-sectional area of a circular pipe by mean fluid speed to find volume flow per second and per minute. Use mean flow speed and the internal diameter. Reynolds number is dimensionless; any flow-regime threshold depends on geometry and conditions.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Multiply the internal cross-sectional area of a circular pipe by mean fluid speed to find volume flow per second and per minute.
When this tool is useful
Volume flow = pi*(d/1000)^2*v/4 m³/s; Volume flow = pi*(d/1000)^2*v/4*60000 L/min
Understanding your inputs
| Input | What to enter |
|---|---|
| Internal pipe diameter (mm) | Enter a number of at least 1e-12 and no more than 1000000000000. |
| Mean flow speed (m/s) | Enter a number of at least 0 and no more than 1000000000000. |
Frequently asked questions
What assumptions does this calculation use?
Multiply the internal cross-sectional area of a circular pipe by mean fluid speed to find volume flow per second and per minute. Use mean flow speed and the internal diameter. Reynolds number is dimensionless; any flow-regime threshold depends on geometry and conditions.
How is the result calculated?
Volume flow = pi*(d/1000)^2*v/4 m³/s; Volume flow = pi*(d/1000)^2*v/4*60000 L/min