Flow Rate Calculator

Calculate volumetric and mass flow rates for fluids in pipes and channels.

Flow Parameters

Pipe Diameter (mm)

Flow Velocity (m/s)

Fluid Density (kg/m³)

Flow Rate Results

Enter parameters to calculate flow

About this calculator

Quick Reference

QVolumetric Flow Rate

ṁMass Flow Rate

A (Area)π × (d/2)²

Water Density1000 kg/m³

1 m³/s60,000 L/min

Overview

Flow rate measures the volume or mass of fluid which passes per unit time. It is a key parameter in plumbing, hvac, and chemical engineering.

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Pro Tips

For water, the density is approximately 1000 kg/m³.
Flow velocity is often kept below 3 m/s in domestic plumbing to prevent noise and damage.
Turbulent flow occurs at high velocities and large diameters.

Fun Facts

"The Amazon River has an average discharge of about 209,000 cubic meters per second."
"Blood flow in the human aorta reaches velocities of about 30 cm/s during systole."
"Venturi meters use the link between flow rate and pressure to measure velocity."

Formula: Q = A × v, ṁ = Q × ρ