Drainage Pipe Calculator : Pipe Quantity and DWV Sizing Guide

NEW v1.0

Calculate total drainage pipe needed for a run including waste/fittings allowance, and get a recommended pipe diameter from a standard DWV fixture-unit sizing table.

Drainage Pipe Calculator

Calculate total drainage pipe needed for a run including waste/fittings allowance, and get a recommended pipe diameter from a standard DWV fixture-unit sizing table.

Drain Run Details

Guidance: toilet ≈ 4 DFU, sink ≈ 1-2 DFU, shower ≈ 2 DFU.

Pipe Quantity & Sizing

Total Pipe Needed

55.0 ft

Run: 50 ft + 5.0 ft waste/fittings allowance (10%)

Bends / Fittings:

3

Recommended Pipe Diameter:

3"

Sizing is a reference DWV (drain-waste-vent) fixture-unit lookup, not a precise hydraulic calculation: ≤1 DFU → 1.5", 2-3 DFU → 2", 4-8 DFU → 3", 9-20 DFU → 4".

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Trin-for-trin-guide

1

Enter Run Length and Bends

Input total horizontal/vertical drain run length in feet and the number of bends or fittings.

2

Enter Total Fixture Units

Sum the drainage fixture units (DFU) of all fixtures connected to the run (toilet ~4 DFU, sink ~1-2 DFU, shower ~2 DFU).

3

Review Pipe Needed and Size

Get total pipe length to purchase (run + 10% waste/fittings allowance) and the recommended pipe diameter from the DWV sizing table.

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Ofte stillede spørgsmål (10)

Almindelige spørgsmål og svar om dette værktøj.

A 10% allowance on top of the measured run length is standard to cover offcuts, fitting engagement, and bends.
Per standard DWV (drain-waste-vent) sizing guidance: up to 1 DFU needs a 1.5 inch pipe, 2-3 DFU needs 2 inch, 4-8 DFU needs 3 inch, and 9-20 DFU needs 4 inch. This is a reference lookup, not a precise hydraulic calculation.
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