What does a 10% slope mean?

A 10% slope means you rise (or fall) 10 units for every 100 units traveled horizontally. It corresponds to an angle of about 5.7 degrees. Roads with 10% grades are considered quite steep.

How do road grade percentages work?

Road grade is the slope expressed as a percentage. Most highways stay under 6–7%. Steep mountain roads can reach 12–15%. Grades above 20% are extremely rare and dangerous for vehicles.

What is the ADA maximum slope for ramps?

The Americans with Disabilities Act (ADA) requires wheelchair ramps to have a maximum slope of 1:12, which equals approximately 8.33%. This ensures safe access for wheelchair users.

How do I convert slope percentage to degrees?

Use the arctangent function: Angle (°) = arctan(Slope% / 100). For example, a 10% slope → arctan(0.10) ≈ 5.71°. Most calculators have an atan or arctan button.

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IPL 2026

Slope Percentage Calculator

Convert slope (rise over run) to a percentage grade. Used in road engineering, ramp design, hiking trails, construction, and wheelchair accessibility standards to express steepness as a percentage.

Complete User Guide

Enter the rise (vertical elevation change) and run (horizontal distance). Both must be in the same unit. The calculator divides rise by run and multiplies by 100. A positive result is an uphill slope; negative is downhill.

The Mathematical Formula

(Rise / Run) * 100

Slope % = (Rise / Run) × 100. A rise of 5 m over a run of 100 m gives a 5% grade. This is equivalent to an angle of arctan(0.05) ≈ 2.86°.

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