Parking Lot Stalls Calculator

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 25, 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.