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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.

Slope and Grade Calculator 📐
Choose Your Application
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Ramp
Accessibility
💧
Drainage
Water Flow
🚗
Driveway
Road Grade
🏠
Roof
Pitch
📐
General
Any Purpose
Slope Measurements
💡 Tip: We've pre-filled typical values for an ADA-compliant wheelchair ramp. Adjust the numbers or click Calculate to see results!
Application Type: Select what you're calculating slope for
Measurement System: Choose your preferred units
Rise (Vertical Height): The vertical distance (height difference)
Run (Horizontal Distance): The horizontal distance

Embed Slope and Grade Calculator 📐 Widget

About Slope and Grade Calculator 📐

Calculate Slope and Grade
Enter the rise (vertical height) and run (horizontal distance) to calculate slope as a percentage, ratio, or angle. The Slope and Grade Calculator helps engineers, contractors, and DIYers design compliant ramps, proper drainage, safe driveways, and effective roof pitches.
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Multiple Formats
Get slope as percentage (%), ratio (1:12), and angle (degrees) all in one calculation.
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ADA Compliance
Instant verification that wheelchair ramps meet accessibility standards and building codes.
🏗️
Application-Specific
Recommendations tailored for ramps, drainage systems, driveways, and roof pitches.

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)

Reference this content, page, or tool as:

"Slope and Grade Calculator 📐" at https://MiniWebtool.com/slope-and-grade-calculator/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: Nov 05, 2025

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