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 9 × 18 ft, or 162 square feet; compact stalls run 112–136. But a stall can't be used without the aisle serving it: half of a 24 ft two-way aisle brings a 90° space to 270 sq ft, and with a cross lane the tightest lots need about 290 square feet per space. Square and small lots need more, because their drive lanes take a bigger share: a square acre works out near 430 sq ft a space. So 40 spaces need at least 12,300 sq ft; the converter on this page does any count.

About 100 to 150, depending on the lot's shape. An acre is 43,560 square feet. Laid out as tightly as 90° parking allows, on a long lot about 358 × 122 ft, it holds 148 cars; a square acre with drive lanes at both ends holds 102, because the lanes take more of it. Islands, extra entrances and accessible spaces pull either number lower. For a real lot, enter its length and width in the parking lot layout calculator.

Up to about 30, laid out as tightly as 90° parking allows: a lot about 160 × 63 ft holds a double row of stalls on a 24 ft two-way aisle. A squarer 10,000 sq ft lot holds fewer, because its drive lanes take a bigger share of it, and islands or accessible spaces take more again.

At least about 0.66 of an acre: 100 spaces need 28,600 sq ft or more laid out as tightly as 90° parking allows. As a square lot with drive lanes at both ends they need about 40,500 sq ft, or 0.93 of an acre. Landscaping, islands and accessible spaces add to both.

Most U.S. lots use 9 × 18 ft stalls. Drive aisles run about 24 ft for two-way 90° parking, 18 ft one-way at 60° and 13 ft one-way at 45°, so a double-loaded 90° bay — stalls on both sides of one aisle — measures 60 ft from curb to curb. Accessible stalls are 8 ft wide with a 5 ft access aisle, 11 ft for a van. Local codes set the exact numbers, so treat these as the typical case and measure the lot you're bidding.

At 2026 US market rates, 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, drive-thru lanes, and gum-covered walkways — price higher, commonly $0.12–$0.20 per square foot, and dumpster pads are quoted flat at $75–$150 each. 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 the square footage 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.

Subtract them. Islands, planter beds, and any section that's out of scope come off the total. The calculator on this page does it: add each paved section, then enter the islands under "Island / out of scope". 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.