[tool]

Find the drop

Find the slope

Run (length of pipe)

Examples: 12', 5' 3 1/2", 3/4", 2.5m

Slope per foot

1/16"

⅛"

¼"

½"

Other

Drain size

2½" and smaller

3" to 6"

8" and larger

Enter measurements above 0 to see results.

Minimum slope for horizontal drainage, IPC Table 704.1 (2021): 2½" and smaller ¼" per foot, 3" to 6" ⅛" per foot, 8" and larger 1/16" per foot. Your local code (UPC, amendments) may differ. Estimates only. Check measurements, product labels and local building codes before you buy or build.