Free calculator

Pipe Slope & Grade

Calculate total invert drop for a gravity drain pipe at a given slope.

Results

Enter your dimensions and hit Calculate.

Local plumbing codes govern minimum slope. Verify with your inspector or plumber.

Assumptions

  • 1/4 in per ft (2%) is the minimum recommended slope for 4-in drain pipe (IPC/UPC).
  • Calculation is for straight runs only.

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Land Planning Master Checklist

The complete checklist for planning your property — from raw land to build-ready site. Clearing, access, drainage, septic, utilities, permits, foundation, and everything in between.

  • ✓Every stage in the right sequence
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  • ✓Common mistakes and how to avoid them

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