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.

BunnyCalculator

Blog

IPL 2026

Slope Percentage Calculator

Convert slope (rise over run) into a percentage grade.

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°.

Frequently Asked Questions

Related Tools

Percentage Calculator Slope Calculator

Calculator

Verified Precise

Secure

100% Free

Precise