Building Drain Sizing Calculator

Size building drains based on fixture units and slope per UPC/IPC drainage tables.

Sum of all drainage fixture units.
DFU
Slope in inches per foot (1/4" = 0.25, 1/8" = 0.125).
in/ft

Results

Building Drain Size-inches
Drain Capacity-DFU
Approximate Flow-GPM
References: Based on UPC Table 703.2 and IPC Table 710.1(2) building drain sizing