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Fixture Unit Calculator

Total drainage fixture units (DFU) for a fixture list per IPC Table 709.1.

Fixture type

Count

DFU

4
1
2
Total Drainage Fixture Units7DFU

Per IPC Table 709.1 -- use this total to size the building drain and building sewer

IPC Table 709.1 DFU Reference

FixtureDFU value
Toilet4
Lavatory (bathroom sink)1
Bathtub2
Shower2
Kitchen sink2
Dishwasher2
Clothes washer3
Utility / laundry sink2
Floor drain2
Drinking fountain0.5

Reference: IPC Table 709.1 -- Drainage fixture unit values for fixtures and fixture groups

For reference only. Verify with your local building code and a licensed professional before making decisions.

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