Spike's Calculators


Elevation Grade from Inches per Foot

Elevation Grade from Inches per Foot

This calculator will calculate the drop or rise in inches, the difference in elevation, from a slope expressed in inches per foot.

Example calculation
a 40 foot length of pipe requires a 1/8" drop per foot
40 * 1/8 = 40/8 = 5
The required drop from start of the pipe to the end is 5"

Elevation Grade / Slope of Inches per Foot

Length ft in
Slope per Foot in n
Fraction Precision #


Difference in Height in


  1. length in feet & inches
  2. required slope inches per foot
  3. fraction precision preset @16


  1. required drop in inches

Excavation Calculators

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