Pipe Sizer - Water Pipe Sizing

PipeSizer helps you quickly choose the right pipe diameter for water systems — for both pressure and gravity flow.

PRESSURE PIPE SIZING

• Size pipes from a target flow rate.

• Set your maximum friction rate and velocity limits.

• Calculations based on the Hazen-Williams equation.

GRAVITY PIPE SIZING

• Size pipes from a target flow rate.

• Evaluate flow capacity and velocity under gravity conditions.

• Calculations based on the Manning equation.

KEY FEATURES

• Automatic recommended pipe size based on your limits.

• Multiple pipe materials with built-in coefficients (more added over time).

• Works in both SI and Imperial (I-P) units.

• Designed for engineers, plumbers, and irrigation/drainage design workflows.

Feedback is welcome — it directly shapes upcoming updates.