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Use this parking lot size calculator for a rectangular, usable area with 90° stalls in double-loaded modules: a row of stalls on each side of an aisle. It also works as a parking lot striping calculator for existing rows and a parking lot cost calculator using your own unit prices. Space counts are geometric concepts before accessible parking, entrances, islands, setbacks and other code or site deductions, not an approved site plan.
Concept spaces before code and site deductions
80
Planning estimate from the numbers you enter. Coverage, density, waste and price are assumptions, not a supplier quote or an engineering specification. Concept layout only, not a code-compliant parking plan. Capacity excludes accessible stalls, access aisles, setbacks, islands, turning areas and entrances. Cost excludes grading, base work, drainage, markings beyond divider lines, permits and tax. Dengaro is a financing broker, a brand of Funding Routes LLC, not the lender or a paving contractor.
How it works
Each double-loaded module is twice the stall depth plus one aisle width. Divide usable lot width by that module width and round down. Each module has two rows; divide lot length by stall width and round down for spaces per row. Multiply rows by spaces per row. This intentionally omits a partial single-loaded module. The paving estimate covers the full rectangle, including aisles and leftover strips. A designer must revise the concept for local access, circulation and parking requirements.
Formula
Area = length × width; acres = area ÷ 43,560. For single side/end divider stripes, each continuous row of n spaces needs n + 1 lines. Total stripe feet = (spaces + rows) × stall depth, or zero when no spaces fit. Striping estimate = stripe feet × your $/ft. Paving estimate = full rectangular area × your $/ft²; the subtotal adds the two estimates.
Example
With a 24 ft aisle, a module is 60 ft wide. Two modules fit across the 120 ft width, giving four rows with 20 spaces each: 80 concept spaces. The area is 21,600 ft², about 0.50 acres. Divider striping is (80 + 4) × 18 = 1,512 ft. At assumed prices of $3/ft² for paving and $0.50/ft for divider striping, costs are $64,800 and $756, for a $65,556 estimated subtotal.
Tips
Striping-only mode needs total spaces and the number of separate continuous rows, including row-end lines. Forty spaces split across two rows have 42 divider lines. At 18 ft each, that is 756 linear ft and an estimated $378 at $0.50/ft. This model counts single divider lines, not double-line stall boxes, front/back boundary lines, arrows, crosswalks, curbs, accessible symbols or access-aisle hatching.
Budget
Get site-specific pricing for grading, aggregate base, pavement thickness, drainage, mobilization, minimum striping charges, permits and taxes. Those items are not included in this subtotal, and sealcoating is not added. The default 9 ft stall and 24 ft aisle are editable planning dimensions, not universal code requirements. Dengaro is a financing broker, a brand of Funding Routes LLC, not the lender or a paving contractor.
Important questions
No. It fits only full rectangular 90° double-loaded modules. It does not allocate accessible stalls or access aisles, turning areas, driveways, fire lanes, setbacks, landscaping or drainage. A qualified designer and local authority must check the final plan.
Width too small for another full double-loaded module adds no spaces. A designer may fit a single-loaded row or another layout, but this calculator does not assume one. Length and width have different roles, so swapping them can change the capacity.
Single stall side dividers and a divider at each row end. Every row with n spaces has n + 1 such lines. Enter separate row counts, not drive aisle counts. Symbols, hatching, front/back boundaries and double-line patterns need a separate takeoff.
No. It multiplies the entire rectangle by your paving unit price and adds divider striping by linear foot. Site preparation, base work, drainage, extra markings, minimum charges, permits and taxes are excluded unless already reflected in a unit price you supply. Results are estimates, not offers.
Yes. Choose Striping only, enter total spaces, separate continuous rows, divider depth and your price per linear foot. The result contains no paving charge. Use whole-number counts and at least one space in each row.