Rentable Square Footage Calculator


Calculating rentable square footage is crucial for both tenants and landlords in commercial real estate. This measurement determines the total space a tenant will occupy, including their share of common areas. To simplify this process, we’ll provide a working calculator along with detailed instructions on its usage.

How to Use

To utilize the rentable square footage calculator, follow these steps:

  1. Enter the usable square footage of the space.
  2. Input the percentage of common area factor.
  3. Click the “Calculate” button to obtain the rentable square footage.


The formula for calculating rentable square footage is:

Rentable Square Footage=Usable Square Footage×(1+Common Area Factor100)

Example Solve

Suppose a tenant has a usable space of 1,000 square feet with a common area factor of 15%.

Using the formula:

Rentable Square Footage=1000×(1+15100)=1000×1.15=1150 square feet

Therefore, the rentable square footage is 1150 square feet.


Q: What is the common area factor?
A: The common area factor represents the proportion of shared spaces such as corridors, restrooms, and lobbies. It’s usually expressed as a percentage of the usable square footage.

Q: Why is calculating rentable square footage important?
A: Rentable square footage helps determine the total space cost for tenants and assists landlords in setting lease terms and pricing.

Q: Can the calculator handle fractional common area factors?
A: Yes, the calculator can handle fractional common area factors. Simply input the percentage accurately.


Accurately calculating rentable square footage is vital in commercial real estate transactions. With our calculator and comprehensive guide, tenants and landlords can efficiently determine this crucial metric, facilitating smoother lease negotiations and property management.

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