Elevation Grade Calculator

What Is an Elevation Grade Calculator?

An elevation grade calculator determines how steep a slope is from vertical rise and horizontal run. It returns grade as a ratio, percentage, and angle of elevation. Land surveyors, road builders, and homeowners use grade to plan drainage, retaining walls, and safe access paths.

Elevation Grade Formulas

The grade (slope) of terrain is rise divided by run:

$$ \text{grade} = \frac{\text{rise}}{\text{run}} $$

Convert to percentage by multiplying by 100:

$$ \text{grade (\%)} = \frac{\text{rise}}{\text{run}} \times 100 $$

The angle of elevation in degrees uses the arctangent:

$$ \text{angle} = \arctan\left(\frac{\text{rise}}{\text{run}}\right) $$

For related slope tools, try the Angle of Depression Calculator or Angle Cut Calculator.