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Parking Lot Stalls Calculator

Estimate the number of parking stalls a lot can hold, plus required accessible spaces.

How it is calculated

The tool divides the lot area by the area allotted to one stall and rounds down: stalls = floor(area / stall_area). Both values are in m², and the per-stall figure must include the stall itself plus its share of drive aisles and turning space. If you leave it empty it uses 25 m². Accessible stalls follow the 2010 ADA table 208.2: 1–25 stalls need 1, 26–50 need 2, 51–75 need 3, 76–100 need 4, 101–150 need 5, 151–200 need 6, 201–300 need 7, 301–400 need 8, 401–500 need 9, 501–1000 need 2% of the total, and above 1000 it is 20 plus 1 per 100 over 1000 (3,000 stalls gives 40). This is a US rule; requirements differ by country, so check the local code before design.

Worked example

A lot of 5,000 m² with 28 m² per stall including aisles. Stalls: 5000 / 28 = 178.57, rounded down to 178. Accessible stalls: 178 stalls fall in the 151–200 band of the 2010 ADA table, which requires 6. The result is a first estimate for planning, not a striping layout.

Try this example →

Common mistakes

  • Entering the area of a single bay (about 12–15 m²) as the per-stall value. The figure must include aisles, otherwise the count is far too high.
  • Using the whole plot area when part is taken by landscaping, entrances, buildings or drainage. Enter only the usable paved area.
  • Entering square feet in one field and square metres in the other. Both are m².
  • Treating the accessible-stall figure as the legal requirement. It follows the US 2010 ADA table and is not adjusted to other countries' or local rules.

Sources

About this calculator

Estimating stall count starts with usable lot area divided by the area required per stall, which includes not just the parking space itself but its share of the drive aisle and manoeuvring room — commonly around 300–350 sq ft (28–33 m²) per standard stall depending on the angle of parking (90° layouts pack more stalls per area than angled layouts, which need less aisle width but more stall-to-stall length). U.S. ADA and equivalent accessibility codes elsewhere then mandate a minimum number of accessible spaces on a sliding scale tied to total stall count — for example, 1 accessible space per 25 stalls up to 100, rising more slowly above that.

Civil engineers, architects, and site planners use this kind of estimate at the earliest design stage to check whether a proposed lot meets a development's required parking ratio before detailed striping plans are drawn, and property developers use it to gauge how much buildable land a project's parking requirement will consume.

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Comments (1)

  • Editorial team

    Feed in the area that can really hold cars. Landscaping, a building footprint, drainage ponds and entrance driveways come off the total first, or the stall count is inflated. If the per-stall area is left blank, 25 square metres is assumed. The accessible-stall figure follows the US 2010 ADA table, so check your local code for the real requirement. Do you know your municipality's minimum stall size?

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