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.

Which of my two measurements is the length and which is the width?

They are not interchangeable. The length is the direction stalls sit side by side, so it gets divided by the 9 ft stall width; the width is the direction rows stack, so it gets divided by the 60 ft double-loaded band (18 ft of stalls, a 24 ft aisle, another 18 ft of stalls). Those two divisors are so far apart that the same rectangle entered the other way round usually returns a different count, often by a wide margin. Which way the rows run is a design decision rather than a property of the site, so run it both ways and keep the orientation that also suits your entrance and building frontage.

Why does the count jump in steps when I change the width slightly?

Because the width is carved into whole 60 ft bands and any remainder is discarded — a lot just short of two bands counts as one, and a little extra width across the threshold doubles the answer. It also means leftover width earns nothing here even when it is usable: roughly 42 ft of remainder (one 18 ft stall depth plus a 24 ft aisle) can usually take a single-loaded row against the boundary in a real layout, and this tool never counts those. That is one direction in which the figure reads low, and a code that permits compact or narrower stalls is another. Most of what the model leaves out — the entrance drive, the cross aisle, setbacks, landscaping islands — works the other way instead, and the two sides do not cancel by any predictable amount.

Does the 24 ft aisle allowance cover the drive into the lot?

No. The only aisle in the model is the one shared between each pair of stall rows. Nothing is set aside for the entrance drive, for a cross aisle at the ends of the rows so a car can move from one aisle to the next, or for any setback from the property line — take all of that off your two measurements before entering them, or the count comes back optimistic. The 24 ft figure also assumes two-way traffic and stalls at 90 degrees; a scheme built on one-way aisles with angled stalls commonly uses a narrower aisle but eats more length per stall, and this tool cannot weigh that trade for you.

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Parking Lot Size Calculator

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

Answers as you typeNo submit button
Every formula citedNamed published standards
Calculated in your browserNo account, nothing uploaded

SettingsSettings for this calculationUS

Market

Imperial · sales tax

Lot Length

The length of the parking area, along which stalls line up side by side.

Measure the usable paved length available for stalls.

Lot Width

The width of the parking area, across which stall rows and drive aisles stack.

A double-loaded row pair (stalls on both sides of one aisle) needs about 60 ft of width using standard dimensions.

Estimated stall count

84 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: 2 pairs

Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

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

Inputs used

Lot Length: 195 ft
Lot Width: 120 ft

Intermediate steps

Stalls per row: 21 stalls
Double-loaded row pairs: 2 pairs

Final result84 stalls

Confidence note: 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.

What this calculation does not cover

The last line of the arithmetic multiplies by two, so every band of width is credited with a full row of stalls on both faces of its aisle and the answer can only ever come out even; a row that runs against a building frontage, a fence or a retaining wall is single-loaded in reality and delivers half of what is counted here.
Stall width, stall depth and aisle width are three fixed constants in the file with no input offered for any of them, so compact bays, a wider stall than the 9 ft (2.7 m) assumed, and 45- or 60-degree angled rows are layouts this tool has no way to express.
Only the two plan dimensions reach the calculation, which makes the site a flat empty rectangle: a slope steep enough to force terracing, an existing tree, transformer pad or manhole in the middle of the paving, or a column grid in a covered deck all remove stalls that the count keeps.
No term subtracts anything after the multiplication, so the furniture a finished lot carries — a dumpster enclosure, a cart corral, EV charger bollards, light-pole bases, a snow-storage corner — is still being counted as parkable stalls.
Length and width are floored independently before they are combined, which makes the figure non-additive: an L-shaped or tapering site broken into two rectangles and run twice throws away a length remainder and a width remainder in each piece, and the two answers added together fall below what one continuous striping run across the same paving would hold.

Estimated cost — your price

Price per stall ($)

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.

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-09-05 · in the site-wide review of 2026-09-06 · v1.0.1

Regulatory standards & verification citations1

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

Cite this page

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.

Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

Laying Out a Car Parkuses this calculator
The vehicle you cannot turn away sets aisle width, stall angle and stall count on a site lot - lay it out from the swept path outward.
Designing a Site Entrance Trucks Can Use

How to calculate parking lot size in 3 steps

Lot LengthThe length of the parking area, along which stalls line up side by side.
Lot WidthThe width of the parking area, across which stall rows and drive aisles stack.
Estimated stall countThe tool computes the estimated stall count from those figures and shows the formula, its sources, and a confidence rating alongside it.

Estimated stall count by lot length

Page defaults, not your figures above.

Lot Length	Estimated stall count (stalls)
100 ft	22
150 ft	32
200 ft	44
250 ft	54
300 ft	66
350 ft	76

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.
Which of my two measurements is the length and which is the width?: They are not interchangeable. The length is the direction stalls sit side by side, so it gets divided by the 9 ft stall width; the width is the direction rows stack, so it gets divided by the 60 ft double-loaded band (18 ft of stalls, a 24 ft aisle, another 18 ft of stalls). Those two divisors are so far apart that the same rectangle entered the other way round usually returns a different count, often by a wide margin. Which way the rows run is a design decision rather than a property of the site, so run it both ways and keep the orientation that also suits your entrance and building frontage.
Why does the count jump in steps when I change the width slightly?: Because the width is carved into whole 60 ft bands and any remainder is discarded — a lot just short of two bands counts as one, and a little extra width across the threshold doubles the answer. It also means leftover width earns nothing here even when it is usable: roughly 42 ft of remainder (one 18 ft stall depth plus a 24 ft aisle) can usually take a single-loaded row against the boundary in a real layout, and this tool never counts those. That is one direction in which the figure reads low, and a code that permits compact or narrower stalls is another. Most of what the model leaves out — the entrance drive, the cross aisle, setbacks, landscaping islands — works the other way instead, and the two sides do not cancel by any predictable amount.
Does the 24 ft aisle allowance cover the drive into the lot?: No. The only aisle in the model is the one shared between each pair of stall rows. Nothing is set aside for the entrance drive, for a cross aisle at the ends of the rows so a car can move from one aisle to the next, or for any setback from the property line — take all of that off your two measurements before entering them, or the count comes back optimistic. The 24 ft figure also assumes two-way traffic and stalls at 90 degrees; a scheme built on one-way aisles with angled stalls commonly uses a narrower aisle but eats more length per stall, and this tool cannot weigh that trade for you.

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 — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.