Work out parking lot capacity instantly with clear inputs, formula shown and shareable results.
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.
Bay count
spaces = floor(site area x (1 - circulation share) / area per bay)
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.
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.
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.