Kitchen Plumbing Calculator

Calculate supply and DWV pipe quantities, fixture units, and material costs for kitchen plumbing rough-in.

Inputs

Sink compartments

Dishwasher? (0=No, 1=Yes)

Ice maker? (0=No, 1=Yes)

Pot filler faucet? (0=No, 1=Yes)

Main run length (ft)

Supply pipe (0=PEX, 1=CPVC, 2=Copper)

Tab to move between fields

Results

Total fixture units

6.5

Drain pipe size (in.)3

Vent pipe size (in.)2

Total pipe needed (ft)87

Cold supply pipe (ft)27

Hot supply pipe (ft)23

Drain pipe (ft)24

Vent pipe (ft)13

Estimated material cost$259.00

Fittings cost (included)$60.00

How to Use This Calculator

Select the number of sink compartments (1 = single bowl, 2 = double, 3 = triple).
Toggle Dishwasher, Ice Maker, and Pot Filler to 1 for each appliance being connected.
Enter the main run length in feet — the distance from your supply/stack to the kitchen fixtures.
Choose your supply pipe material: 0 = PEX, 1 = CPVC, or 2 = Copper.
Review Total Fixture Units and Drain Pipe Size to ensure your drain can handle the load.
Use the Estimated Material Cost to budget for pipe and fittings before hiring a plumber.

What each input means

Sink compartments: Single, double, or triple-bowl kitchen sink.
Dishwasher? (0=No, 1=Yes): Adds hot/cold supply and dedicated drain connection.
Ice maker? (0=No, 1=Yes): Refrigerator ice maker / water dispenser line.
Pot filler faucet? (0=No, 1=Yes): Wall-mounted cold water faucet near the range.
Main run length (ft): Distance from main supply/stack to kitchen fixtures.
Supply pipe (0=PEX, 1=CPVC, 2=Copper): Supply pipe material. DWV is always PVC.

What each result means

Total fixture units: UPC drainage fixture units determining drain pipe size.
Drain pipe size (in.): Minimum drain pipe diameter per code.
Vent pipe size (in.): Minimum vent pipe diameter.
Total pipe needed (ft): All supply + DWV pipe footage combined.
Cold supply pipe (ft): 3/4" main + 1/2" branches.
Hot supply pipe (ft): Hot water supply run.
Drain pipe (ft): DWV drain run footage.
Vent pipe (ft): Vent stack footage.
Estimated material cost: Pipe + fittings material cost (labor not included).
Fittings cost (included): Estimated fittings at ~30% of pipe cost.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Sink compartments = 2, Dishwasher? (0=No, 1=Yes) = 1, Ice maker? (0=No, 1=Yes) = 1, Pot filler faucet? (0=No, 1=Yes) = 0 = 6 input(s) provided
Calculate Total fixture units
Total fixture units
6.5 = 6.5
Calculate Drain pipe size
3 = 3
Calculate Vent pipe size
Vent pipe size
2 = 2

Engine last updated August 5, 2026. Checked against 2 independently-derived tests — how we verify calculators.

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