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MotionLab
How much fluid volume passes a point per second, from a pipe's size and the fluid's speed.
For an incompressible fluid, flow rate stays constant through a pipe of varying width — so fluid speeds up where the pipe narrows (like a thumb over a garden hose) and slows down where it widens, keeping A×v constant.
This formula gives the ideal flow rate from geometry and speed alone — real-world flow also depends on pipe roughness, length, and viscosity, which this simple calculation doesn't account for.
Flow rate (m³/s)
0.02
Q = A · v
What you entered
Q = A × v
0.01 × 2= 0.02 m³/sResult
Flow rate (m³/s): 0.02
Fluid moving at 2 m/s through a 0.01 m² pipe flows at 0.02 m³/s.