Before you use the result
The number of accessible parking spaces a lot must provide isn't a flat percentage — it follows a specific table in the 2010 ADA Standards for Accessible Design, based on the total number of spaces in the lot. This calculator applies that table and the van-accessible rule so you can check a lot at a glance.
This gives you the federal minimum. State and local building codes can require more, and certain facilities (like outpatient medical or rehabilitation) have higher ratios. Dimensions, access aisles, signage, and the accessible route to the entrance also have to comply — confirm the full design with a qualified professional.
Transparent assumptions
How this calculator works
Total spaces set the minimum. Up to 25 total spaces requires 1 accessible; the requirement climbs on a sliding scale to 500, then becomes 2% of the total, then 20 plus 1 per 100 above 1,000.
Van-accessible rule. At least one of every six accessible spaces (rounding up) must be van accessible, with a wider access aisle and a 'van accessible' sign.
The remainder are car accessible. The calculator splits the required total into van-accessible and standard accessible spaces so you can plan signage and layout.
Formula used
- Accessible = ADA §208.2 table (1 up to 25 spaces … 2% from 501–1,000)
- Van accessible = ceiling(Accessible ÷ 6), minimum 1
- Car accessible = Accessible − Van accessible
Quick reference
Required accessible spaces (2010 ADA Standards)
Federal minimum total accessible spaces by total parking provided. At least 1 in 6 of those must be van accessible. State/local codes may require more.
| Total spaces in lot | Minimum accessible spaces |
|---|---|
| 1 to 25 | 1 |
| 26 to 50 | 2 |
| 51 to 75 | 3 |
| 76 to 100 | 4 |
| 101 to 150 | 5 |
| 151 to 200 | 6 |
| 201 to 300 | 7 |
| 301 to 400 | 8 |
| 401 to 500 | 9 |
| 501 to 1,000 | 2% of total |
| 1,001 and over | 20, plus 1 per 100 over 1,000 |
Frequently asked questions
How many ADA parking spaces are required?
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.
How many van-accessible spaces do I need?
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.
Is the ADA requirement a percentage of total spaces?
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.
Do state and local codes change these numbers?
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.
What else has to comply besides the number of spaces?
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 count is just the starting point — a qualified professional should confirm the full design.
Before you hire: The Pavement Directory does not provide legal or compliance advice. ADA and accessibility requirements vary by site, jurisdiction, and project scope. Contractors may perform striping, grading, concrete, or asphalt corrections, while CASp inspectors or accessibility consultants may be needed for compliance review. Consult qualified professionals when compliance is material.
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