How do I convert slope to percentage grade?

Grade (%) = slope × 100. A slope of 0.05 is a 5% grade.

What is a typical road grade?

Interstate highways are usually under 6%. Steep mountain roads can exceed 10-15%.

Free Online Calculators

Slope Percentage Calculator

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Slope Calculator

Percentage & Degrees

Rise (Vertical Distance)

Run (Horizontal Distance)

Ensure Rise and Run use the same units (e.g., meters, feet).

Slope Percentage

Slope percentage expresses grade as rise/run × 100%. Common in roads, ramps, and construction.

Formula

grade(%) = (rise / run) × 100

Example

Rise 2 m over 10 m run → (2/10) × 100 = 20%.

FAQs

Angle to percent?
% = tan(θ) × 100.

Accessibility?
Building codes set max grades for ramps.

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