How to Use the Parking Space Size Calculator
Wondering if your vehicle will fit comfortably into a given parking spot? Most U.S. municipal and commercial parking spaces are built to a standard 9 feet wide by 18 feet long, though exact local codes vary slightly. Enter your vehicle's width and length, and this calculator shows how much clearance you'd have on each side and front-to-back against that standard.
Side clearance is calculated as (space width minus vehicle width) divided by two, representing the gap on each side if you park dead center. Roughly 0.8 ft (about 10 inches) per side or more is comfortable for opening doors and getting in and out; anything close to zero or negative means a higher risk of dinging the car next to you, so a wider or end space is worth seeking out.
For reference, ADA accessible spaces are built differently — typically 8 feet wide with a 5-foot access aisle beside them, or wider still for van-accessible spots. Keep in mind real parking lots often have columns, angled layouts, or curbs that make the usable clearance feel tighter than this simple calculation suggests, so treat it as a planning estimate rather than an exact guarantee.
Frequently Asked Questions
Most U.S. municipal and commercial parking spaces are around 9 feet wide by 18 feet long, though some cities allow slightly narrower or shorter spaces depending on local code.
A standard ADA accessible space is 8 feet wide with a 5-foot access aisle alongside it, while a van-accessible space needs either a wider 11-foot space or an 8-foot space paired with an 8-foot aisle.