Commercial Drain Sizing Calculator
Size commercial drain, vent, and cleanout requirements based on fixture units and building configuration.
Inputs
Results
Drain Pipe Size
4 in
Vent Pipe Size
2 in
Cleanouts Required4
Required Slope0.125 in/ft
How to Use This Calculator
- Enter Total Fixture Units (DFU), Building Stories, and Pipe Run Length (ft).
- Review Drain Pipe Size and Vent Pipe Size (in).
- Use Cleanouts Required and Required Slope (in/ft) to inform your decision.
- Use the chart to visualize the results and explore different scenarios by adjusting inputs.
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