Plumbing Slope Calculator
Calculate the minimum drain pipe slope and total drop needed based on pipe diameter and run length per IPC/UPC code.
Inputs
ft
Results
Min Slope
0.25 in/ft
Total Drop Needed5 in
Recommended Slope0.25 in/ft
Slope2.08%
Slope Angle1.19°
Drain Classification2
How to Use This Calculator
- Enter Pipe Diameter (inches) — common drain sizes are 1.5, 2, 3, and 4 inch.
- Input Pipe Run Length (ft) — the horizontal distance the drain must travel.
- Review Minimum Slope (in/ft) per code (typically 1/4 inch per foot for drains 3 inch and under).
- Check Total Drop Needed (inches) and Recommended Slope.
- Use Slope Degrees and Slope Percent when marking slope on a laser level.
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