Drain Slope Calculator
Calculate the correct slope for drainage pipes to ensure proper water flow. Determine slope percentages, fall rates, and drainage requirements for your project.
Step 1: Pipe Dimensions
Understanding Drain Slope
Proper drainage slope is typically 1/4″ to 1/2″ per foot (2-4% slope). Too little slope causes standing water; too much causes water to outrun solids.
Step 2: Calculation Options
Building Code Requirements
Most building codes require a minimum slope of 1/4″ per foot (2% slope) for drainage pipes. Check local regulations for specific requirements.
Drain Slope Results
Slope Percentage
Plumbing Code Standards
| Pipe Diameter | Minimum Slope | Recommended Slope | Maximum Slope |
|---|
Important Notes
Always check local building codes. These are general standards based on International Plumbing Code (IPC) and Uniform Plumbing Code (UPC).
Slope Visualization
Slope Calculation Formula
Slope Percentage = (Fall ÷ Length) × 100
To calculate slope percentage: Divide the vertical fall by the horizontal length, then multiply by 100 to get percentage.
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