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Both calculators run independently — change the inputs on either side to compare results.

Pipe Sizing Calculator

Find the minimum required pipe diameter to keep fluid velocity within safe limits for a given flow rate. Use this when selecting pipe sizes for new installations or checking whether existing pipes can handle increased flow.

Flow Rate (L/min)

Maximum Velocity (m/s)

Safety Factor

Fill in the required fields to see your result.

Fluid Mechanics

Pipe Flow Calculator

Determine pressure drop in circular pipes using the Darcy-Weisbach equation. Use this when designing water supply lines, HVAC ducts, or industrial piping systems to ensure adequate flow.

Pipe Diameter (m)

Pipe Length (m)

Pipe Material

Flow Velocity (m/s)

Kinematic Viscosity (m²/s)

Fill in the required fields to see your result.

Key differences

	Pipe Sizing Calculator	Pipe Flow Calculator
Category	Fluid Mechanics	Fluid Mechanics
Inputs required	3	5
Result	Minimum Pipe Diameter (mm)	Pressure Drop (Pa)
What it does	Find the minimum required pipe diameter to keep fluid velocity within safe limits for a given flow rate. Use this when selecting pipe sizes for new installations or checking whether existing pipes can handle increased flow.	Determine pressure drop in circular pipes using the Darcy-Weisbach equation. Use this when designing water supply lines, HVAC ducts, or industrial piping systems to ensure adequate flow.