Construction
Fixture Unit Calculator (DFU/WSFU)
Add up Drainage Fixture Units (DFU) per IPC/UPC for drain sizing, and Water Supply Fixture Units (WSFU) for supply sizing.
Total DFU
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- Total WSFU
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- Min building drain
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- Min water service
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FAQ
IPC vs UPC? +
Both codes use fixture units but the values differ slightly. This calc uses IPC; verify with your AHJ.
Why hose bibs count zero DFU? +
They drain outdoors, not into the building DWV system.