Pipe/Tube Sizing Calculator

Calculate flow rate, velocity, or pipe diameter for your piping system

Pipe Inner Diameter (D):

Fluid Velocity (V):

Result:

0.00

Pipe Inner Diameter (D):

Flow Rate (Q):

Result:

0.00

Flow Rate (Q):

Fluid Velocity (V):

Result:

0.00

How to Use This Pipe Sizing Calculator

Select the calculation type (Flow Rate, Velocity, or Pipe Diameter)
Enter the required parameters
Click the calculate button
View the result and select different units if needed

Pipe Sizing Formulas

The calculator uses the following formulas:

Flow Rate (Q): Q = V × (π × D²/4)
Velocity (V): V = Q / (π × D²/4)
Pipe Diameter (D): D = √(4 × Q / (π × V))

Where:
Q = Flow rate
V = Velocity
D = Pipe inner diameter