Drainage Fixture Unit Calculator
Calculate total drainage fixture units and determine required drain, vent, and stack pipe sizes per plumbing code.
Inputs
Results
Total DFU
22 DFU
Required Drain Size
4 inches
Required Vent Size2 inches
Stack Size3 inches
How to Use This Calculator
- Count each fixture type in the building: toilets, sinks, showers, bathtubs, clothes washers, and dishwashers.
- The calculator sums up the Total DFU using IPC/UPC fixture unit values for each type.
- Review Required Drain Size and Required Vent Size to specify pipe diameters on your plans.
- Check Stack Size to size the vertical drain/soil stack serving multiple floors.
- Use these results to verify your plumbing plans meet code before permit submittal.
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