1. What is Gross Square Footage?

Gross Square Footage (GSF) is the total floor area of a building measured from the exterior walls. It includes all spaces within the building perimeter, including structural elements, mechanical areas, and common spaces.

2. How to Calculate GSF

The calculation formula is simple:

Where:

• \( Area_1, Area_2, \ldots, Area_n \) — Individual area measurements in square feet
• All areas are summed to get the total gross square footage

Explanation: Measure each floor area separately and sum them together to get the total building GSF.

3. Importance of GSF Calculation

Details: Accurate GSF calculation is essential for property valuation, construction cost estimation, zoning compliance, building code requirements, and space planning.

4. Using the Calculator

Tips: Enter each area measurement in square feet, one per line. The calculator will sum all valid numeric values. Ensure all measurements are in the same unit (sq ft).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between GSF and net square footage?
A: GSF includes all areas within exterior walls, while net square footage excludes structural elements and common areas, measuring only usable space.

Q2: Should I include basement areas in GSF?
A: Yes, basement areas are typically included in GSF calculations if they are finished and habitable spaces.

Q3: How do you measure irregularly shaped areas?
A: Divide irregular shapes into regular geometric shapes (rectangles, triangles), calculate each area separately, then sum them.

Q4: Are exterior features like balconies included?
A: Typically no - GSF usually includes only areas within the exterior walls. Balconies, terraces, and exterior features are calculated separately.

Q5: What measurement standards are used for GSF?
A: Most professionals follow BOMA (Building Owners and Managers Association) standards or local building code definitions for consistent measurements.