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Water Supply Pipe Sizing Calculator

Determine the minimum pipe diameter needed to deliver a required flow rate under specified pressure and elevation conditions. Used by hydraulic engineers designing water mains, irrigation systems, and building reticulation.

Required Flow Rate (L/s)

Pipe Length (m)

Elevation Difference (m)

Minimum Pressure Required (kPa)

Pipe Material

Fill in the required fields to see your result.

Civil

Pipe Flow Calculator (Hazen-Williams)

Determine water flow rate and velocity in pressurized pipes using the Hazen-Williams empirical equation. Ideal for civil engineers sizing water mains, irrigation lines, or fire-suppression systems.

Pipe Diameter (mm)

Pipe Length (m)

Head Loss (m)

Hazen-Williams Coefficient

Fill in the required fields to see your result.

Key differences

	Water Supply Pipe Sizing Calculator	Pipe Flow Calculator (Hazen-Williams)
Category	Civil	Civil
Inputs required	5	4
Result	Required Pipe Diameter (mm)	Flow Rate (L/s)
What it does	Determine the minimum pipe diameter needed to deliver a required flow rate under specified pressure and elevation conditions. Used by hydraulic engineers designing water mains, irrigation systems, and building reticulation.	Determine water flow rate and velocity in pressurized pipes using the Hazen-Williams empirical equation. Ideal for civil engineers sizing water mains, irrigation lines, or fire-suppression systems.