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Trailer Ramp Length Calculator

Find the ramp length needed to keep a load-and-unload slope at or below a target maximum grade.

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

Minimum ramp length

10.94 ft (minimum length)

Check your inputs

This is a straight-line ramp length based on grade alone — also check your specific equipment's ground clearance and approach/departure angle limits, which can require an even longer or hinged ramp regardless of grade.

With the figures above, the minimum ramp length comes to 10.9 ft (minimum length). The method behind this is well established, though site conditions and material batches will move it somewhat. This is calculated for United States and cites IRC 2024. Building in another market? Change the selector above so the units and code reference follow.

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

  • Ramp length = rise height / (maximum grade percent / 100) — the same rise/run relationship used in the Slope & Grade Calculator, solved for length

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 a lower grade percentage need a longer ramp?
For the same vertical rise, a gentler (lower percentage) slope spreads that rise over a longer horizontal distance — it's the same rise/run relationship as any ramp or driveway grade.
What grade is safe for wheelchairs or hand trucks?
The ADA sets a maximum of about 8.33% (1:12) for accessible ramps — much gentler than the 15% often used for loading equipment onto a trailer, since human-powered mobility needs a much easier grade than a powered vehicle does.
Does ramp width matter for this calculation?
No — this calculates length based on the rise and slope only. Width is a separate consideration based on your equipment's wheelbase or track width.