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Parking Lot Capacity Calculator

Work out parking lot capacity instantly with clear inputs, formula shown and shareable results.

About Parking Lot Capacity Calculator

Aisles and access typically consume a third of a site, so bays fit into the remaining usable area, and the area-per-bay figure includes that circulation overhead. The all-in figure of about 25 to 30 square metres per bay is what planners use, which is roughly double the bay itself once aisles are counted.

Formula

Bay count

spaces = floor(site area x (1 - circulation share) / area per bay)

Worked example

With the default values below, Parking Lot Capacity Calculator returns Parking bays that fit of 104. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total site areaminimum 1 m2
2,000 m2
Area of one bayminimum 0.1 m2
12.5 m2
Share of the site used by aisles and accessaccepts 0–80 %
35 %
Share of bays that must be accessibleaccepts 0–50 %
5 %

Results

Parking bays that fit
104
Area available for bays
1,300.0 m2
Accessible bays required
6
Total site area per bay
19.23 m2

Step by step

  1. 1Values used
  2. 2Bay count
  3. 3Parking bays that fit= 104
  4. 4Area available for bays= 1,300.0 m2
  5. 5Accessible bays required= 6
  6. 6Total site area per bay= 19.23 m2

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Parking Lot Capacity figure worked out?

spaces = floor(site area x (1 - circulation share) / area per bay). Aisles and access typically consume a third of a site, so bays fit into the remaining usable area, and the area-per-bay figure includes that circulation overhead.

Why does this matter?

The all-in figure of about 25 to 30 square metres per bay is what planners use, which is roughly double the bay itself once aisles are counted.

What do I need to enter?

Enter total site area, area of one bay, share of the site used by aisles and access, share of bays that must be accessible. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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