Parking Requirement Calculator

Calculate code parking counts and accessibility spaces.

Urban Planning
1

Design Parameters

Gross Floor Area (GFA) must be entered.

Quick Presets

Commercial Retail Store
1500 m² commercial building.

Calculated Outputs

Required Parking Stalls Standard Minimum
0.00
Accessible Spaces (ADA) ADA Minimum
0.00

Parking Layout & Zoning Requirements

Municipal zoning ordinances dictate the minimum number of off-street parking spaces required based on use classification.

Our professional parking calculator computes zoning requirements, standard vehicle stall counts, and ADA accessible space minimums to help you plan parking envelopes.

Parking Space Dimensions Diagram showing typical parking stall dimensions.

How Parking Ratios are Determined

Municipal zoning codes establish off-street parking requirements using ratios tied to occupancy classifications. These ratios typically compare floor areas (e.g., 4 spaces per 100 sq m of Gross Leasable Area) or unit counts (e.g., 1.5 spaces per residential apartment unit).

Required Parking Stalls = Gross Floor Area ÷ Parking Ratio Factor
ADA Accessible Stalls = Calculated minimum based on total parking space inventory
Example Calculation (1,500 m² Commercial Building):

1. Zoning Use Category: Retail/Commercial.

2. Zoning Parking Ratio: 1 space per 25 m² of GFA (or 4 spaces per 100 m²).

3. Gross Floor Area (GFA): 1,500 m².

4. Required Standard Stalls: 1,500 m² ÷ 25 m² = 60 spaces.

5. ADA Accessible Stalls: For an inventory of 51 to 75 total spaces, ADA codes mandate a minimum of 3 accessible spaces (including 1 van-accessible space).

Result: Site plan must provide 60 total parking spaces, with at least 3 designed to meet ADA accessibility standards.
Warning: Zoning bylaws, setback requirements, parking ratios, and buildable envelopes vary widely by municipality and jurisdiction. Always verify calculations against the local zoning ordinance and consult with a municipal planner or design professional before submitting development plans.

ADA Accessible Space Requirements

The Americans with Disabilities Act (ADA) establishes strict ratios for accessible parking spaces based on the total parking inventory. If a site has 1 to 25 spaces, at least 1 must be accessible. For 26 to 50 spaces, at least 2 are required, and so on. Accessible spaces must feature wider dimensions (at least 8 feet wide for cars, 11 feet for vans) and adjacent access aisles (5 feet wide) to accommodate wheelchair lifts.

Frequently asked questions

What is the size of a standard parking stall?

A standard parking stall is typically 9 x 18 feet (2.7 x 5.5 meters).

How many ADA spaces are needed for 100 stalls?

Under ADA guidelines, a parking lot with 76 to 100 total stalls must provide a minimum of 4 accessible spaces (including at least 1 van-accessible space).

What does GFA stand for in parking rules?

GFA stands for Gross Floor Area. It represents the total horizontal area of all floors inside the building envelope, which zoning codes use to calculate parking loads.