ADA Parking Space Calculator

It's based on the total number of spaces in the lot. The federal minimum is 1 accessible space for lots up to 25 spaces, 2 for 26–50, 3 for 51–75, 4 for 76–100, and so on up a sliding scale; from 501–1,000 spaces it's 2% of the total. Enter your count above for the exact minimum.

At least one of every six required accessible spaces must be van accessible, rounding up — so a lot needing 4 accessible spaces needs at least 1 van accessible, and a lot needing 7 needs at least 2. Van spaces have a wider access aisle and a 'van accessible' sign.

Only for large lots. Up to 500 spaces it follows a fixed table, not a percentage. From 501 to 1,000 spaces it becomes 2% of the total, and above 1,000 it's 20 spaces plus one more for each additional 100. This is why a simple percentage often gives the wrong answer for small and mid-size lots.

All of them. Standard, compact, and the accessible stalls themselves all count in the total you enter. A lot with 48 standard stalls and 2 accessible stalls is a 50-space lot, which requires 2 accessible spaces — it already complies. Counting only the standard stalls reads the table one bracket low.

Each parking facility separately, which usually requires more spaces than treating the site as one. Two 60-space lots calculated as one 120-space facility would suggest 5 accessible spaces; calculated correctly, each 60-space lot needs 3, for 6 in total. This is the most common reason a multi-lot property is short.

Yes. A facility with four or fewer spaces still requires one accessible space meeting the dimensional requirements, though the federal standard does not require it to be signed as reserved. Confirm state and local rules, which may differ.

They carry higher ratios than the general table. Under the 2010 Standards, hospital outpatient facilities require 10% of patient and visitor parking to be accessible, and rehabilitation and outpatient physical therapy facilities require 20%. This calculator applies the general table only — select the medical context above and get a qualified review rather than relying on the general number.

They can only make them stricter, not looser. Some states and municipalities require more accessible spaces or additional van spaces, and specific facility types (such as outpatient medical or rehabilitation facilities) have higher ratios. Always confirm against the codes that apply to your site.

Accessible spaces need proper dimensions, marked access aisles, compliant signage at the right height, a firm and level surface, and an accessible route connecting them to the building entrance without stairs or steep slopes. The federal minimum widths for accessible spaces and access aisles are summarized in the parking space dimensions guide. The count is just the starting point — a qualified professional should confirm the full design.