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Parking Lot Size Calculator

Estimate how many standard parking stalls fit in a lot, using a double-loaded aisle layout.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-25 · v1.0.0

Market
Imperial · sales tax
197 ft118 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Estimated stall count

42 stalls

Low confidence

This is a rough site-planning estimate using a simple rectangular double-loaded layout — actual capacity depends on your specific lot shape, ADA-accessible stall requirements, landscaping islands, one-way vs two-way aisles, and local zoning code minimums, which a civil engineer or site planner accounts for in a real design.

Stalls per row
21 stalls
Double-loaded row pairs
1 pairs

For the dimensions entered, expect a estimated stall count of 42 stalls. Of the working steps, stalls per row dominates at 21 stalls. The confidence rating here is low. Get the figure confirmed by a supplier or a qualified trade before committing to it. Set for United States against IRC 2024. The market selector changes both the units and the code cited.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Standard parking stall is commonly 9 ft x 18 ft with a 24 ft two-way drive aisle between double-loaded rows — a widely used general site-planning guideline

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Does this account for ADA-accessible stalls?
No — accessible stalls need extra width and an adjacent access aisle, and most codes require a minimum number based on total stall count. Subtract a few standard stalls and add appropriately-sized accessible stalls to a real layout.
Why 9x18 ft specifically?
It's a commonly used standard stall size in North American site planning, though some jurisdictions and lot types (compact stalls, angled parking) use different dimensions — check your local zoning code for required minimums.
Does lot shape affect real capacity a lot?
Yes significantly — irregular lot shapes, required landscaping islands, stormwater features, and fire lane access all reduce real-world capacity below this simple rectangular estimate. Treat this as a rough upper-bound planning figure, not a final design.