Calculators
Coming soon
Fixtures + DFU
Drainage Fixture Units, pipe sizing and vent stack for residential bathrooms and kitchens.
Free · no signupInstant results
What it asks and what it returns
Data in, numbers out.
You give it
Fixture list (lav, shower, WC, washer…)
Horizontal drain run (ft)
Number of stories
Engine
It returns
Total DFU per branch + vent stack
Minimum pipe diameter per branch
Vent stack size per code
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