Compare calculators

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

Water Pipe Flow Calculator

Calculate flow rate in a pressurized water pipe using the Hazen-Williams equation. Used by plumbing and civil engineers to size distribution mains, evaluate pump systems, and check hydraulic capacity.

Pipe Diameter (inches)

Pipe Length (ft)

Head Loss (ft)

Hazen-Williams C Value

Fill in the required fields to see your result.

Civil

Pipe Flow Velocity Calculator

Calculates the average flow velocity of fluid in a circular pipe given a volumetric flow rate and pipe diameter. Use it when sizing pumps, checking design velocities, or troubleshooting pipe systems.

Flow Rate (m³/s)

Pipe Diameter (mm)

Fill in the required fields to see your result.

Key differences

	Water Pipe Flow Calculator	Pipe Flow Velocity Calculator
Category	Civil	Civil
Inputs required	4	2
Result	Flow Rate (gpm)	Flow Velocity (m/s)
What it does	Calculate flow rate in a pressurized water pipe using the Hazen-Williams equation. Used by plumbing and civil engineers to size distribution mains, evaluate pump systems, and check hydraulic capacity.	Calculates the average flow velocity of fluid in a circular pipe given a volumetric flow rate and pipe diameter. Use it when sizing pumps, checking design velocities, or troubleshooting pipe systems.