Pipe Sizing Calculator

Determine the proper pipe diameter for water supply lines based on total fixture units, run length, and elevation change. Compare materials and costs to find the best option for your project.

Pipe Material

Supply Line Parameters

Total Fixture Units

Pipe Run Length (ft)

Elevation Change (ft)

Supply Pressure (PSI)

Pricing per Linear Foot (edit to match local rates)

Copper ($/ft)

PEX ($/ft)

CPVC ($/ft)

Galvanized ($/ft)

Recommended Diameter

3/4"

For 6 fixture units

Best Flow Rate

8 GPM

Copper pipe

Lowest Cost

$47.50

CPVC (50 ft)

Purchase Option	Quantity	Est. Cost
Copper 3/4"	8 GPM / 7.9 PSI drop	$262.50
PEX 3/4"	7 GPM / 8.4 PSI drop	$55.00
CPVC 3/4"Best value	7.3 GPM / 8.2 PSI drop	$47.50
Galvanized Steel 3/4"	5 GPM / 10 PSI drop	$150.00

Recommended: CPVC 3/4" ($47.50)CPVC provides a low-cost rigid alternative. Solvent-welded joints are fast to assemble, though it is less flexible than PEX for tight spaces.

This is an estimate based on simplified hydraulic calculations. Actual pipe sizing depends on local plumbing codes, water velocity limits, and specific fixture requirements. Always consult a licensed plumber for final sizing decisions.