Mechanical EngineeringP0

Pipe Flow Calculator

Calculate volumetric flow rate in a pipe from pipe diameter and fluid velocity using Q = A × v.

Inputs

Enter your values below

Pipe Inner Diameter*mm

Fluid Velocity*m/s

Result

Flow Rate

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Enter values and click Calculate

Formula

π × diameter² ÷ 4 × velocity × 3600

Result unit: m³/h

Continuity equation: Q = A × v × 3600 where A = πd²/4. With d in meters and v in m/s, Q is in m³/h (×3600 converts seconds to hours).

Introduction

Calculate volumetric flow rate through a pipe given its inner diameter and the fluid velocity. This is the fundamental continuity equation used in pipe sizing and hydraulic design.

Calculation Example

A 100mm ID pipe with water flowing at 2 m/s carries approximately 56.55 m³/h.

Inputs: diameter=100, velocity=2

Result: 56.55 m³/h

Engineering Applications

•Pipe sizing
•Pump system design
•Hydraulic calculations
•Flow measurement

Frequently Asked Questions

What is a typical pipe velocity for water?

Typical water velocity in pipes is 1-3 m/s. Values above 3 m/s may cause erosion and high pressure drop.

What formula does this use?

Q = π × d² / 4 × v × 3600 (continuity equation, converted to m³/h). This assumes the pipe is flowing full.

Related Calculators

Pressure Drop Calculator (Darcy-Weisbach)Pipe Velocity Calculator Reynolds Number Calculator

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Disclaimer: Calculations are for reference and educational purposes only. Always verify results independently for engineering design. See full disclaimer.