SettingsSettings for this calculationUS
The total vertical height the ramp climbs, from bottom to top.
Measure the full vertical rise the ramp needs to overcome, such as the height difference between a site entrance and grade level.
The total horizontal length the ramp covers.
Measure the horizontal distance from the base of the ramp to where it reaches full rise — not the sloped length along the ramp surface.
Ramp slope percentage
7.692 %
This checks against the widely-referenced 1:12 (≈8.33%) maximum slope benchmark from ADA/ANSI A117.1 accessible-route standards. A temporary construction ramp's actual required slope depends on its specific use (pedestrian-only vs. equipment/wheelbarrow access, which may have different practical limits) and any project-specific accessibility requirements — confirm the applicable standard for your specific ramp's purpose.
- Run-to-rise ratio
- 13 :1 (target ≥12:1)
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Temporary Access Ramp Slope Compliance Calculator: 7.69 % — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- Slope percentage = (Rise ÷ Horizontal Run) × 100; run:rise ratio = Run ÷ Rise. The widely-referenced maximum ramp slope for accessible routes (per ADA Standards for Accessible Design / ANSI A117.1) is 1:12 (a rise of 1 inch for every 12 inches of run, ≈8.33%) — commonly used as a practical benchmark for temporary construction site ramps even when full ADA compliance isn't the specific driver, since it represents a widely-recognized safe/walkable maximum grade.
Inputs used
- Ramp Total Rise (Vertical)
- 1.5 ft
- Ramp Horizontal Run
- 19.5 ft
Intermediate steps
- Run-to-rise ratio
- 13 :1 (target ≥12:1)
Confidence note: This checks against the widely-referenced 1:12 (≈8.33%) maximum slope benchmark from ADA/ANSI A117.1 accessible-route standards. A temporary construction ramp's actual required slope depends on its specific use (pedestrian-only vs. equipment/wheelbarrow access, which may have different practical limits) and any project-specific accessibility requirements — confirm the applicable standard for your specific ramp's purpose.
What this calculation does not cover
- Only looks at the slope along the ramp. CROSS slope — the fall across its width — is held far tighter, to 1:48 (2%), and a temporary ramp bedded on site fill or bridging a kerb picks that up without anyone measuring it. A chair on a compliant running slope with a 4% cross fall steers itself toward the edge.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-06 · in the site-wide review of 2026-09-06 · v1.0.1
Regulatory standards & verification citations1
- Slope percentage = (Rise ÷ Horizontal Run) × 100; run:rise ratio = Run ÷ Rise. The widely-referenced maximum ramp slope for accessible routes (per ADA Standards for Accessible Design / ANSI A117.1) is 1:12 (a rise of 1 inch for every 12 inches of run, ≈8.33%) — commonly used as a practical benchmark for temporary construction site ramps even when full ADA compliance isn't the specific driver, since it represents a widely-recognized safe/walkable maximum grade.
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