Slope and Grade Calculator 📐
Calculate slope as a percentage, ratio, or angle based on rise and run measurements. Perfect for drainage systems, driveways, ramps, and roofing projects with support for both imperial and metric units.
About Slope and Grade Calculator 📐
How to Use the Slope and Grade Calculator
Select your application type (ramp, drainage, driveway, or roof), choose your measurement system (imperial or metric), and enter your rise (vertical height change) and run (horizontal distance). The calculator automatically computes the slope percentage, ratio, and angle in degrees, plus provides application-specific recommendations and compliance information.
Understanding Slope Measurements
- Percentage: Rise divided by run, multiplied by 100. Example: 2% means 2 units of rise per 100 units of run.
- Ratio: Expressed as rise:run or 1:X. Example: 1:12 means 1 unit of rise for every 12 units of run.
- Angle: The angle of inclination in degrees. Calculated using arctangent (rise/run).
- Slope Length: The actual distance along the slope (hypotenuse), calculated using the Pythagorean theorem.
Common Slope Applications
| Application | Recommended Slope | Code/Standard |
|---|---|---|
| Wheelchair Ramp | 1:12 (8.33%) | ADA maximum for accessibility |
| Drainage (General) | 1-2% (1:100 to 1:50) | Minimum 1% for proper flow |
| Driveway | 10-15% max comfortable | Up to 20% possible, challenging in winter |
| Roof Pitch | 4:12 to 9:12 typical | Varies by material and climate |
| Sidewalk (Accessible) | 5% max (1:20) | ADA compliant walking surface |
Key Formulas
Slope Percentage = (Rise ÷ Run) × 100
Slope Angle (degrees) = arctan(Rise ÷ Run) × (180 ÷ π)
Slope Length = √(Rise² + Run²)
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"Slope and Grade Calculator 📐" at https://MiniWebtool.com// from MiniWebtool, https://MiniWebtool.com/
by miniwebtool team. Updated: Nov 05, 2025