Pipe Flow Calculator

Calculate flow rate, velocity, or pipe diameter for fluid systems.

Flow Parameters

Solve For

Velocity (v) (m/s)

Internal Diameter (D)

Calculation Results

Enter parameters

About this calculator

Overview

In a pipe system, the flow rate (Q) is the product of the average fluid velocity (v) and the cross-sectional area (A) of the pipe.

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Pro Tips

Continuity Principle: For an incompressible fluid, Q is constant through different sections.
Increasing the diameter while keeping Q constant will decrease the velocity.
Too high velocity can lead to noise, erosion, and pressure spikes.

Fun Facts

"In industrial piping, water velocity is typically kept between 1 and 3 m/s."
"Laminar flow turns into turbulent flow as velocity increases (measured by Reynolds number)."
"Fire hoses use tapered nozzles to increase velocity by decreasing the exit area."

Formula: Q = v · A