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

Darcy-Weisbach Pressure Drop Calculator

Calculates pressure drop along a pipe section using the Darcy-Weisbach equation. Used by engineers designing water supply, HVAC, and industrial piping systems to size pipes and pumps correctly.

Friction Factor

Pipe Length (m)

Pipe Diameter (m)

Flow Velocity (m/s)

Fluid Density (kg/m³)

Fill in the required fields to see your result.

Fluid Mechanics

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.

Key differences

	Darcy-Weisbach Pressure Drop Calculator	Pipe Network Flow Distribution Calculator
Category	Fluid Mechanics	Fluid Mechanics
Inputs required	5	6
Result	Pressure Drop (Pa)	Flow in Pipe 1 (m³/s)
What it does	Calculates pressure drop along a pipe section using the Darcy-Weisbach equation. Used by engineers designing water supply, HVAC, and industrial piping systems to size pipes and pumps correctly.	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.