Ramp Calculator
Calculate ramp length, slope percentage, ratio, and angle for wheelchair access, trailer loading, and construction projects
Interactive Calculator
Input Values
Or enter any of these:
Results
📐 Enter any two values to calculate ramp specifications
How to Use This Calculator
1. Select your ramp use case (wheelchair, trailer, etc.)
2. Enter any TWO known values (rise + run, or rise + slope, etc.)
3. Results calculate automatically in real-time
4. Check warnings to ensure compliance with standards
5. Copy or export results for your project
Ramp Standards
Frequently Asked Questions
What is the 1:12 ramp slope rule?
The 1:12 rule means for every 1 inch of vertical rise, you need 12 inches of horizontal run. This creates an 8.33% slope, which is the maximum allowed by ADA for wheelchair accessibility.
How do I measure rise and run?
Rise is the vertical height from ground to the top of the ramp. Run is the horizontal distance the ramp travels. Measure from the base to where the ramp ends.
Do I need a landing on my ramp?
Yes, for wheelchair ramps over 30 inches of rise, you need a level landing (minimum 60″ x 60″) every 30 inches of vertical rise. This provides rest areas and improves safety.
Can I use a steeper slope for a short ramp?
While possible, it’s not recommended for accessibility. Steeper slopes are harder to navigate and may not meet local building codes. Always verify with local regulations.