Wheelchair Ramp Slope Calculator & ADA Ramp Calculator Online
Free wheelchair ramp slope calculator and ADA ramp calculator online. Calculate ramp slope, ramp angle, length, and cost with ADA compliance. Our handicap ramp calculator provides accurate accessibility specifications for safe ramp design.
Last updated: October 19, 2025
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Vertical distance the ramp needs to overcome (step height, threshold, etc.)
Ramp Specifications
Required Ramp Length
96.0"
Compliance Level:
ADA Compliant
✓ ADA Compliant
Slope
8.3%
Angle
4.8°
Landing Size (minimum)
60.0" × 60.0"
Handrails: Required
Both sides, 34-38" height, proper grip diameter
Material Estimates:
Estimated Construction Cost:
Recommendations:
- •Handrails required on both sides
- •Ensure non-slip surface and proper drainage
ADA Compliance Tips:
- • Maximum 1:12 slope ratio (8.33% grade)
- • Maximum 30" rise per ramp run
- • Minimum 5' × 5' landing at top and bottom
- • 36" minimum clear width between handrails
- • Non-slip surface required in all weather conditions
Ramp Calculator Types & Applications
Our ramp calculator online handles all types of accessibility and mobility ramp calculations
Wheelchair Ramp Slope Calculator
ADA Standard: 1:12 ratio (8.33%)
Max Rise: 30 inches per run
Applications: Commercial, public access
Also called: Handicap ramp slope per foot
8" rise = 96" length (8 feet)
ADA Ramp Slope Calculator
Compliance: Federal ADA standards
Slope: Maximum 8.33% grade
Requirements: Handrails, landings
Also called: ADA ramp slope percentage
ADA Compliant: 1:12 ratio
Ramp Angle Calculator
ADA Standard: 4.76° maximum
Calculation: arctan(1/12)
Safety: Wheelchair accessible
Also called: Ramp degree calculator
1:12 slope = 4.76°
Disabled Ramp Gradient Calculator
Gradient: 8.33% maximum
Formula: (rise/run) × 100
Accessibility: Mobility device friendly
Also called: Ramp incline calculator
1:12 = 8.33% gradient
Wheelchair Ramp Cost Calculator
Concrete: $75-120/ft
Aluminum: $100-200/ft
Wood: $50-100/ft
Also called: Wheelchair ramp estimate
8ft ramp: $600-1,600
Forklift Ramp Slope Calculator
Industrial: 1:6 to 1:8 ratio
Steeper: Allowed for equipment
Safety: OSHA compliant
Also called: Industrial ramp calculator
1:6 = 16.67% grade
ADA Ramp Ratio Reference Chart
1:12
8.33%
ADA Standard
1:10
10%
≤6" rise
1:8
12.5%
≤3" rise
1:6
16.67%
Industrial only
How Our Ramp Calculator Online Works
Our ramp calculator online uses federal accessibility standards to determine compliant ramp specifications. This ramp calculation tool ensures your ramp meets ADA requirements for slope, length, landings, and safety features while providing construction guidance.
Ramp Calculator Online Features
- ADA compliance verification with real-time slope calculations
- Multiple ramp types including wheelchair, handicap, and mobility ramps
- Cost estimation for concrete, aluminum, and wood construction
- Angle and gradient calculations for precise measurements
- Material requirements and construction recommendations
ADA Ramp Calculation Formula
Ramp Length = Rise Height × 12 (for 1:12 slope ratio)The 1:12 ratio means for every 1 inch of vertical rise, you need 12 inches of horizontal run. This creates an 8.33% grade that is safe for wheelchair users and meets federal accessibility standards.
Shows compliant slope ratios, landing requirements, and handrail placement
ADA Compliance Requirements
The Americans with Disabilities Act establishes specific requirements for ramp construction to ensure safe access for individuals using wheelchairs, walkers, and other mobility devices. These standards are federally mandated for public accommodations and many private facilities.
- Maximum slope: 1:12 ratio (8.33% grade) for permanent installations
- Maximum rise: 30 inches per ramp run before requiring intermediate landing
- Minimum width: 36 inches clear between handrails
- Landing requirements: Minimum 5' × 5' at top, bottom, and direction changes
- Handrails required: Both sides for rises > 6 inches, 34-38 inches high
- Edge protection: Required to prevent wheels from slipping off ramp
- Surface: Stable, firm, slip-resistant in all weather conditions
Construction Types and Applications
Permanent Ramps
- • Concrete or steel construction
- • Full ADA compliance required
- • Building permits typically needed
- • 1:12 maximum slope ratio
- • Integrated drainage systems
Temporary Ramps
- • Portable or modular design
- • 1:8 slope may be acceptable
- • Shorter-term installations
- • Aluminum or composite materials
- • Must still meet safety standards
Material and Cost Considerations
Concrete Ramps
$75-120 per linear foot. Permanent, weather-resistant, requires professional installation.
Aluminum Ramps
$100-200 per linear foot. Lightweight, portable, good for temporary or residential use.
Wood Ramps
$50-100 per linear foot. Cost-effective, requires regular maintenance, suitable for residential use.
Sources & References
- ADA Standards for Accessible Design - U.S. Department of JusticeOfficial federal accessibility requirements and technical specifications
- International Building Code (IBC) - International Code CouncilBuilding code requirements for accessibility and ramp construction
- ANSI A117.1 Accessibility Standard - American National Standards InstituteTechnical standards for accessible and usable buildings and facilities
Need more accessibility tools? Try our draw length calculator for adaptive sports or explore ergonomic design calculators.
Get Custom Accessibility ConsultationExample Ramp Calculation
Ramp Calculation Input:
- Rise height: 12 inches
- Ramp type: Wheelchair access
- ADA ratio: 1:12 (8.33% slope)
- Application: Commercial entrance
- Width requirement: 42 inches minimum
Ramp Calculation Steps:
- Length calculation: 12 × 12 = 144 inches (12 feet)
- Slope verification: 12 ÷ 144 = 8.33% grade ✓
- Angle calculation: arctan(1/12) = 4.76° ✓
- Landing requirements: 5' × 5' at top and bottom
- Handrail requirement: Both sides (rise > 6")
Ramp Calculation Result: 12-foot wheelchair ramp with 8.33% slope, fully ADA compliant
This ramp calculation meets all ADA requirements for wheelchair accessibility with proper slope, length, and safety features.
Concrete Ramp
$900-1,440
Aluminum Ramp
$1,200-2,400
Wood Ramp
$600-1,200
Frequently Asked Questions
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