Drainage Pipe Calculator Pro (USA) – Accurate Stormwater Sizing

Drainage Pipe Calculator Pro (USA)

Accurate stormwater design tool using Manning’s Equation for US Engineers & Contractors.

Ground Level Dia (D) Slope (S) Flow (Q)

Visual representation of pipe flow parameters.

Calculate Required Pipe Size

Find the minimum pipe diameter needed to handle a specific flow rate with a given slope.

ft/ft (e.g., 0.5% = 0.005)
Recommended Minimum Pipe Diameter
inches
Commercial Standard Size:

© Drainage Pipe Calculator Pro (USA). All rights reserved.

Disclaimer: This tool is for design estimation. Consult a licensed professional engineer for final construction documents.