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Calcimator

Accessible Route Evaluator

Evaluate an accessible route for ADA compliance across slope, width, and surface requirements.

Inputs

Results

Overall Score (%)

100

Slope Compliance (0-1)1
Width Compliance (0-1)1
Surface Compliance (0-1)1
How to Use This Calculator
  1. Enter the Route Length (ft) — the total length of the accessible path between accessible entrances and elements.
  2. Set Max Slope (%) to the steepest running slope along the route; ADA allows a maximum of 5% for accessible routes.
  3. Enter Minimum Width (inches) at the narrowest point — ADA requires 36 inches minimum, 44 inches preferred.
  4. Set Surface Type: 1=Concrete, 2=Asphalt (both compliant), or 3=Gravel (non-compliant).
  5. Review the Overall Score (%) — 100% means all three criteria pass; any failed criterion drops the score significantly.
  6. Use individual compliance scores (Slope, Width, Surface) to identify which element needs remediation.

How the result changes with Max Slope (%)

Max Slope (%)Overall Score (%)
3100
1165
2065
2765

What each input means

Route Length (ft)
Total length of the accessible route in feet
Max Slope (%)
Maximum running slope as percentage. ADA allows 5% max for walking surfaces.
Minimum Width (inches)
Narrowest point of the route. ADA requires 36" minimum, 44" preferred.
Surface (1=Concrete, 2=Asphalt, 3=Gravel)
ADA requires firm, stable, and slip-resistant surfaces. Gravel is non-compliant.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Route Length (ft) = 200, Max Slope (%) = 5, Minimum Width (inches) = 48, Surface (1=Concrete, 2=Asphalt, 3=Gravel) = 1 = 4 input(s) provided
  2. Calculate Overall Score
    Overall Score
    100 = 100
  3. Calculate Slope Compliance
    Slope Compliance
    1 = 1
  4. Calculate Width Compliance
    Width Compliance
    1 = 1

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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