Drainage Slope

Formula and source

Slope expressed as fraction (1/4 inch per foot), degrees, and percent. Standard horizontal-drainage slopes per IPC 2021 Table 704.1.

IPC 2021 (International Plumbing Code). Section 704, Table 704.1.

Audience

This tile is built for plumbers and the adjacent professions in the Plumbing and Gas group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

Related tools

• Manning's Equation Drainage Slope
• Slope from Digital Level
• Trap Arm Length

Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.