Pipe Slope Calculator — Calculate Proper Drainage Slope for Pipes

Pipe Slope Calculator

Calculate the correct slope for drainage pipes, sewer lines, and plumbing installations. Determine rise, run, and percentage slope for proper water flow.

Step 1: Pipe Dimensions

Understanding Pipe Slope

Pipe slope is the amount of vertical drop per unit of horizontal length. Proper slope ensures efficient drainage and prevents standing water in pipes.

Step 2: Slope Parameters

Standard Pipe Slope Guidelines

For drainage pipes, standard slope is 1/4″ per foot (2% slope) for pipes under 3 inches, and 1/8″ per foot (1% slope) for pipes 3 inches or larger.

Pipe Slope Calculation Results

Summary
Pipe Comparison
Slope Guidelines

Calculated Pipe Slope

2.00%
1/4″ per foot (Standard for 4″ pipe)
Vertical Rise
2.00 inches
Horizontal Run
100.00 feet
Slope Ratio
1:50
Gradient
1/4″ per foot

Pipe Type Slope Comparison

Pipe Type Diameter Min Slope Max Slope Recommended

Standard Pipe Slope Guidelines

Pipe Slope Calculation Formula

Slope Percentage = (Vertical Rise / Horizontal Run) × 100

The pipe slope is calculated by dividing the vertical rise by the horizontal run, then multiplying by 100 to get a percentage. For gradient, it’s expressed as inches of fall per foot of run.

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