Enter the total amount of rentable square footage of a building and the total number of parking spots into the calculator to determine the parking ratio.
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Parking Ratio Formula
The following formula is used to calculate a parking ratio (spaces per 1,000 square feet).
PR = (PS / RSQF) × 1000
- Where PR is the parking ratio in spaces per 1,000 square feet
- RSQF is the rentable square footage of the building
- PS is the total number of parking spaces
To calculate a parking ratio, divide the total number of parking spaces by the rentable square footage and multiply by 1,000. (The inverse, RSQF / PS, is the number of square feet per parking space.)
Parking Ratio Definition
What is a parking ratio? A parking ratio is commonly defined as the number of parking spaces provided per unit of building area, typically stated as parking spaces per 1,000 square feet of rentable (or leasable) area. The inverse is sometimes reported as square feet per parking space (e.g., 1 space per 250 ft²). For example, if a building has 40 spaces and 10,000 ft² of rentable area, the parking ratio is 4 spaces per 1,000 ft² (and the inverse is 250 ft² per space).
Example Problem
How to calculate a parking ratio?
- First, determine the total rentable square footage.
For this example, our 10 story building has a total rentable square footage of 20,000 square feet.
- Next, determine the number of parking spaces.
In this same building, there are 10 parking spaces.
- Finally, calculate the parking ratio.
Using the formula above, the parking ratio is (10 / 20,000) × 1,000 = 0.50 spaces per 1,000 ft² (equivalently, 20,000 / 10 = 2,000 ft² per space).
About Parking Ratio
How to determine the parking ratio? Determining a parking ratio is as simple as using the formula PR = (PS / RSQF) × 1,000 (spaces per 1,000 square feet). Some people also like to express the inverse as square feet per space (RSQF / PS).
