Parking Lot Square Footage Calculator

Multiply length by width for each paved section — the main parking field, the drive aisles, the entry lane, the loading area — and add them together. Divide the total by 43,560 for acres. Lots are rarely one clean rectangle, though: they wrap buildings, taper at the entrance, and include islands you don't clean. Tracing the real outline on satellite imagery gives you the area directly, without breaking the lot into rectangles by hand.

A standard striped stall is about 9 × 18 ft, or roughly 162 square feet. But a stall can't be used without the drive aisle serving it, so parking planners size lots at roughly 300–330 square feet per space once aisles and turning space are included. That's the figure to use when you're estimating a lot's total paved area from a space count: 40 spaces is roughly 12,000–13,200 sq ft, and an acre of parking holds about 130–145 cars.

Large open lots typically run about $0.05–$0.10 per square foot, at the low end of commercial flatwork, because production rates are high once the surface cleaner is moving. Heavily soiled areas — entrance aprons, dumpster pads, drive-thru lanes, and gum-covered walkways — price higher, commonly $0.12–$0.20 per square foot, and pads are often quoted flat. Per-space pricing of roughly $8–$20 per stall is common for maintenance contracts. Sanity-check any per-foot figure against your hourly floor before you send it.

Per-square-foot is safer, because per-space pricing only counts the striped stalls. At $8–$20 per space you're pricing about 162 sq ft of stall, which works out to roughly $0.05–$0.12 per square foot of stall — but the drive aisles, entry lanes, and loading areas can be another 40–50% of the paved surface you actually have to clean. If you quote per space, be explicit about whether aisles are included. Measuring the real paved area first is what lets you make that call deliberately instead of discovering it on site.

Yes, and for commercial bids it's the main advantage. Parking lots are large, open, and unobstructed, which makes them one of the easiest surfaces to measure accurately from satellite imagery. Pull up the address, trace the lot, and you have square footage and acreage without walking the property with a wheel.

On flat, unobstructed hardscape — which describes most parking lots — satellite-based measurement typically lands within 1–3% of a physical measurement. Large lots are actually the favorable case: the perimeter is long relative to the level of detail, so a few feet of edge uncertainty is a much smaller share of a 30,000 sq ft lot than of a 300 sq ft deck. It is an estimating tool, not a land survey — for legal boundaries or permitted construction, use a surveyor.

Yes, and for commercial work you should. Draw the parking field, the drive lanes, the storefront sidewalk, and the dumpster pad as separate shapes and each one keeps its own square footage. That's exactly what an itemized commercial bid needs, since each zone cleans at a different speed and carries a different rate.

Subtract them. Islands, planter beds, and any section that's out of scope come off the total — trace them as their own shape and deduct, or use the calculator on this page to subtract them from the section total. On a lot with a lot of islands this is not a rounding error; it can be several percent of the surface, which on a large bid is real money in either direction.