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Temporary Access Ramp Slope Compliance Calculator

Check a temporary construction access ramp's slope against the standard 1:12 maximum accessibility ratio.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
19.69 ft1.64 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Ramp slope percentage

8.33 %

High confidence

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
12 :1 (target ≥12:1)

For the dimensions entered, expect a ramp slope percentage of 8.33 %. Set for United States against IRC 2024. The market selector changes both the units and the code cited.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • 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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Frequently asked questions

What is the maximum allowable ramp slope this checks against?
This checks against the widely-referenced 1:12 (approximately 8.33%) maximum slope benchmark from ADA Standards for Accessible Design / ANSI A117.1, a rise of 1 inch for every 12 inches of run.
Does 1:12 apply to every temporary construction ramp?
Not necessarily — 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 before relying on this benchmark alone.
What does the run-to-rise ratio tell me?
It expresses the same slope as a ratio (run:rise) rather than a percentage — a 1:12 slope target means at least 12 units of horizontal run for every 1 unit of vertical rise; a lower ratio than 12:1 means the ramp is steeper than the 1:12 benchmark.