How Long Should a Wheelchair Ramp Be for a 22.25-Inch Rise?

On this page (7 sections)

1. How long is a wheelchair ramp for a 22.25-inch rise?
2. Is 267 inches the ramp's full footprint?
3. How should you measure the rise before calculating?
4. What should you check before using the 1:12 calculation?
5. Which wheelchair products may help with the route?
6. How many feet of ramp are needed per inch of rise?
7. What should you do with the 22.25-inch result?

For an ADA ramp length for a 22.25-inch rise, a 1:12 slope needs 267 inches of horizontal ramp run, or 22 feet 3 inches. That is the sloped section's run, not the full area needed for the ramp, landings, and approaches.

The calculation is rise multiplied by 12: 22.25 × 12 = 267 inches. Confirm the actual vertical rise at the site and check the applicable code before choosing a layout.

How long is a wheelchair ramp for a 22.25-inch rise?

At a 1:12 slope, plan for 267 inches of horizontal run. Divide that by 12 to convert inches to feet: 267 ÷ 12 = 22.25 feet, or 22 feet 3 inches.

This ratio means each inch of vertical rise corresponds to 12 inches of horizontal run. The result is a planning calculation, not a site-specific design or an approval that the ramp meets every applicable rule.

For a walkthrough of the calculation, see how to calculate wheelchair ramp length from rise. The wheelchair ramp length formula guide explains the same ratio and how to apply it to other rises.

Is 267 inches the ramp's full footprint?

No. The 267 inches is the horizontal run of the sloped section.

The total space needed also depends on landings, turns, the approach, and how the ramp connects to the upper and lower surfaces.

The sloped surface itself is a little longer than its horizontal run because it also rises 22.25 inches. For layout planning, use the required measurement method in the applicable rules and avoid treating the run as the full ramp length.

An intermediate landing may be needed for a change in direction or other design conditions. At a 1:12 slope, the ramp gains 2.5 inches of height over 30 inches of run, so this rise alone does not reach the ADA provision that calls for an intermediate landing when a ramp run rises more than 30 inches.

Confirm all landing requirements for the setting.

How should you measure the rise before calculating?

Measure straight up from the lower finished surface to the upper surface the ramp must meet. Use the actual rise along the intended route, not an estimate based on the number of steps.

Take measurements at the planned ramp entrance and exit, and note uneven ground or changes in elevation along the route. If the measured rise is different from 22.25 inches, recalculate rather than rounding the number down.

The ramp length increases as total rise increases, because a consistent 1:12 ratio requires 12 inches of run for every inch of height. This basic explanation of why ramp length increases with total rise can help you compare possible entrances.

What should you check before using the 1:12 calculation?

Check which accessibility rules apply to your location and type of project. ADA standards cover certain public and commercial settings, while homes and other sites may also be subject to state or local building codes.

The U.S. Access Board's ADA ramp requirements describe ramp slope, rise, width, and landing provisions for covered facilities.

A 1:12 ratio is a maximum slope under those provisions for new construction, not a guarantee that a specific design is safe or allowed everywhere.

Also check the surface, drainage, handrails, edge protection, clear width, and doorway clearance as relevant to your project. Ask a qualified designer or local building official to review the route before construction.

Which wheelchair products may help with the route?

A wheelchair and cushion can support the person using the route, but they do not change the ramp-length calculation. Choose based on fit, transfer needs, and the user's mobility requirements.

The Drive Medical Blue Streak Lightweight Wheelchair has swing-away footrests and flip-back desk arms that allow table access and easier transfers.

The Drive Medical Blue Streak Foldable Wheelchair has swing-away elevating leg rests and padded desk arms for adjustable positioning.

The Drive Medical 14886 Skin Protection Gel Wheelchair Seat Cushion has a liquid gel core in a foam shell and a removable, water-resistant cover.

Check the wheelchair's fit and the user's needs with a clinician or mobility equipment professional. A product choice does not confirm that a ramp layout is suitable.

How many feet of ramp are needed per inch of rise?

At a 1:12 ratio, each inch of rise needs 1 foot of horizontal run. For 22.25 inches of rise, that is 22.25 feet, or 22 feet 3 inches.

Use this rule only when a 1:12 slope applies to your project. The guide to feet of ramp needed per inch of rise shows how the same relationship scales for other measurements.

What should you do with the 22.25-inch result?

For a 22.25-inch rise, use 22 feet 3 inches as the 1:12 horizontal run for initial planning, then add the space needed for landings, turns, and approaches. Measure the finished surfaces and verify the rules that apply before building.

If you are comparing nearby measurements, review the ramp length for a 1-inch rise to see the per-inch ratio, or compare the ramp run for a 24-inch rise to understand how a slightly larger rise changes the calculation.

Frequently asked questions

How long is a wheelchair ramp for a 22.25-inch rise?

At a 1:12 slope, the ramp run is 267 inches, which equals 22 feet 3 inches. Measure the vertical rise from the lower landing to the top surface, then use the slope required by the applicable code and site plan.

Landings and approach space add to the footprint.

Does a 22.25-inch rise need a landing?

A 22.25-inch rise is more than 30 inches of horizontal run at a 1:12 slope, so an intermediate landing may not be required under ADA ramp provisions for that specific interval. Top and bottom landings still matter, and local rules or site conditions can require more.

Is 22 feet 3 inches the ramp's total length?

No. It is the horizontal ramp run calculated at a 1:12 ratio.

The built ramp's sloped surface is slightly longer, and landings, turns, and clear approach space increase the total space needed.

Confirm the measurement method and layout with the applicable standards and local authority.

Can I use a steeper ramp to save space?

Don't assume a steeper ramp is acceptable because it fits the site. The permitted slope depends on the setting, applicable accessibility rules, and whether the ramp is new or existing.

Check the governing requirements and get qualified design advice before building or changing a ramp.