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
Min Slope
0.25 in/ft
How to Use This Calculator
- Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
- Pipe Diameter — Interior diameter of the drain pipe. Choose from: 1.25", 1.5", 2", 3", 4", 6". default: 2.
- Pipe Run Length — Horizontal distance of the drain pipe run. Accepts values from 1 ft to 500 ft (default: 20 ft).
- Once all inputs are set, review your results in the Results panel. Here's what each output means:
- Min Slope — shown as a numeric value. This is the primary result of this calculator.
- Total Drop Needed — shown as a numeric value.
- Recommended Slope — shown as a numeric value.
- Slope — shown as a numeric value.
- Slope Angle — shown as a numeric value.
- Drain Classification — shown as a numeric value.
- Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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