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`d = ( 0.25 /(12."in"))* "R" + "W" + "x" `

Enter a value for all fields

The **Pipe Grade** calculator computes the depth at the end of a trench needed for a pipe to be laid with a desired grade.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**G**) Drop per 12" (e.g., 1/8" = 0.125 1/4" = 0.25) - (
**R**) Run of Pipe - (
**W**) Outer width of the pipe - (
**x**) Adder

**Depth of Trench (D)**: The calculator returns the depth in inches. However, this can be automatically converted to compatible units via the pull-down menu.

The depth (d) of the fall is a function of the Run (R) and the grade (G):

d = G/(12 inches) *R

where:

- d = vertical displacement
- G = grade in inches drop per foot
- R = horizontal displacement

The end depth of the trench is:

D = d + W + x

where:

- D = Depth of Trench
- d = drop over the run
- W = outer diameter of the pipe
- x = adder for fittings

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