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Commercial ADA Accessible Ramp Length & Landing Calculator

Calculate the total horizontal length and number of intermediate landings needed for a permanent ADA-compliant accessible ramp.

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
3.94 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Total ramp horizontal length

52.24 ft

High confidence

This restates the fixed ADA 2010 Standards ramp geometry requirements (1:12 max slope, 30in max rise per run, 60in min landing length) for total horizontal length planning — it does not check ramp width, cross slope (max 1:48), edge protection, surface requirements, or handrail specifications (see the companion handrail extension calculator), all of which are separately required for full compliance.

Number of ramp runs
2 runs
Intermediate landings required
1 landings

Official municipal inspection prerequisites — United States

Checked against ICC / ACI requirements for the currently selected market. Switching market re-runs these checks.

  • COMPLIANT — Maximum running slope 1:12; maximum rise 30 in (762 mm) per run.

    Rise of 47 in exceeds 30 in, so 1 intermediate landing(s) are mandatory — they are included in the length above.

    2010 ADA Standards §405.2 / §405.6 · 2010 ADA Standards §405.6

These checks cover only the specific thresholds listed above. They are not a complete code review: fire separation, egress, structural capacity and accessibility provisions are outside their scope, and only the handful of local amendments offered in the selector are modelled — your municipality may have others. Final approval rests with your local building authority.

For the dimensions entered, expect a total ramp horizontal length of 15.9. Set for United States against IRC 2024. The market selector changes both the units and the code cited.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

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

  • Per the ADA 2010 Standards for Accessible Design (verified against regulatory text/mirrors this session): maximum running slope is 1:12 (Section 405.2); maximum rise for a single ramp run before a landing is required is 30 inches / 0.762m (Section 405.6); ramp handrails must extend 12 inches / 0.3048m minimum beyond the top and bottom of each run (Section 505.10.3, verified verbatim: 'Ramp handrails shall extend horizontally above the landing for 12 inches (305 mm) minimum beyond the top and bottom of ramp runs'). Minimum landing length is commonly cited as 60 inches / 1.524m (Section 405.7) — this specific figure was not independently re-verified against primary text this session (the source that confirmed the other figures did not include it), but is the standard, uncontested figure used throughout accessibility design references.

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why does the ramp need intermediate landings?
Per ADA 2010 Standards Section 405.6, a single ramp run can rise no more than 30 inches (0.762m) at the maximum 1:12 slope before a level landing is required, so a ramp with more total rise than that needs one or more intermediate landings to break it into compliant runs.
How is the total horizontal length calculated?
At the maximum 1:12 slope, the sloped run length is 12 times the total rise. This calculator adds the length of every required intermediate landing (60 inches / 1.524m each, per Section 405.7) to that sloped-run length to get the total horizontal footprint.
Does a passing result mean the ramp is fully ADA-compliant?
No — this only covers the fixed ramp-run and landing-length geometry (1:12 max slope, 30in max rise per run, 60in min landing length). It does not check ramp width, cross slope (max 1:48), edge protection, surface requirements, or handrail specifications, which are separately required.