Enter the average square footage of a floor and the number of floors of the building into the calculator to determine the gross floor area.

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## Gross Floor Area Formula

The following formula is used to calculate a gross floor area.

GFA = A * F

- Where GFA is the gross floor area (ft^2)
- A is the average area of each floor in the building (ft^2)
- F is the total number of floors in the building

The area of each individual floor can further be calculated using the following formula:

A = L * W

Where L and W are the length and width of a square room. *This only works for floors with square layouts.

## Gross Floor Area Definition

A gross floor area is defined as the sum of the areas of all floors in a building. A floor is typically limited to those with a ceiling height of at least 7.5 feet.

In general, any floors that meet the height requirement are included in the gross floor area. This includes garages, mezzanines, basements, etc.

## Example Problem

**How to calculate gross floor area? **

First, determine the average area of each floor. In this example, the average area of the floors is found to be 1,000 ft^2.

Next, determine the total number of floors in the building. In this case, there are 40 floors in the entire building.

Finally, calculate the gross floor area using the formula above:

GFA = A * F

GFA = 1000 * 40

GFA = 40,000 ft^2