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

Pipe Network Flow Distribution Calculator

Distribute flow between two parallel pipes based on their diameters, lengths, and roughness using Hardy-Cross principles. Useful for engineers balancing water distribution networks and designing parallel pipe systems.

Total Inflow (m³/s)

Pipe 1 Diameter (m)

Pipe 2 Diameter (m)

Pipe 1 Length (m)

Pipe 2 Length (m)

Pipe Roughness

Fill in the required fields to see your result.

Fluid Mechanics

Darcy-Weisbach Pressure Loss Calculator

Compute friction pressure loss in a pipe using the Darcy-Weisbach equation, the rigorous standard for all Newtonian fluids and flow regimes. Useful for pump sizing, pipe sizing decisions, and verifying pressure budgets in process and HVAC systems.

Friction Factor

Pipe Length (m)

Pipe Diameter (m)

Flow Velocity (m/s)

Fill in the required fields to see your result.

Key differences

	Pipe Network Flow Distribution Calculator	Darcy-Weisbach Pressure Loss Calculator
Category	Fluid Mechanics	Fluid Mechanics
Inputs required	6	4
Result	Flow in Pipe 1 (m³/s)	Pressure Loss per Unit Density (m²/s²)
What it does	Distribute flow between two parallel pipes based on their diameters, lengths, and roughness using Hardy-Cross principles. Useful for engineers balancing water distribution networks and designing parallel pipe systems.	Compute friction pressure loss in a pipe using the Darcy-Weisbach equation, the rigorous standard for all Newtonian fluids and flow regimes. Useful for pump sizing, pipe sizing decisions, and verifying pressure budgets in process and HVAC systems.