Pipe Slope and Fall Calculator
Free utility tool

Pipe Slope and Fall Calculator

Enter run length and slope and see the total fall and the invert elevation at the far end.

These tools give planning-level estimates from typical values. They are not quotes, designs or engineering, and results depend on your actual soil, depth, access, local rules and conditions. Only a visit can confirm what a job needs, and we give you a clear price before any work begins.

How it works

Four quick steps.

  1. 01

    Enter the run

    Length of pipe in feet.

  2. 02

    Pick the slope

    Percent or inches of fall per foot.

  3. 03

    Enter the start elevation

    Invert elevation at the upstream end.

  4. 04

    Read the fall

    Total fall and the invert elevation at the far end.

Tips

  • Gravity sewers need a steady slope, not a dip and a rise.
  • Check the minimum slope for your pipe size with your local code.
  • Plan the depth at the connection point before you start digging.
Questions

About this tool.

Is this a design?

No. It is a planning guide. Slope requirements are set by code and the engineer, and we build to the plan.

What slope does a sewer line need?

Local code sets the minimum, which depends on the pipe size. A gentle, constant fall is the goal.

What is an invert?

The elevation of the bottom inside of the pipe.

Free estimate

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