# Square Footage Calculator | Free CRE Tool

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# BOMA-standard SF conversion

Convert between usable and rentable square footage, calculate load factors, and compare building efficiency using BOMA measurement standards.

Load factorBOMAUsable / RentableMulti-floor

Runs locally · Nothing is saved or sent to a server

## Usable vs. rentable is a common source of confusion

The gap between usable and rentable square footage directly impacts total rent obligation. A clean calculator that explains the math helps both sides of the table.

1.  ### A common source of confusion
    
    The difference between usable and rentable square footage is one of the most common points of confusion in office leasing for both tenants and brokers.
    
2.  ### Load factors vary widely
    
    Load factors range from 10% to 25%+ depending on building class, floor plate, and common area configurations. Tenants need to compare apples to apples.
    
3.  ### Impacts total rent obligation
    
    A tenant paying $50/RSF in a building with a 20% load factor is paying $60 per usable square foot. This difference matters in deal economics.
    

## What you can calculate

1.  ### Usable-to-rentable conversion
    
    Convert between usable and rentable square footage by applying the building's load factor.
    
2.  ### Load factor calculation
    
    Calculate load factor (or loss factor) from usable and rentable square footage measurements.
    
3.  ### Floor vs. building comparison
    
    Compare floor-by-floor load factors against the building-wide average to evaluate space efficiency.
    
4.  ### BOMA-standard methodology
    
    Calculations follow BOMA (Building Owners and Managers Association) measurement standards.
    
5.  ### Multi-floor analysis
    
    Analyze square footage across multiple floors simultaneously for multi-floor tenants.
    
6.  ### Rent impact comparison
    
    See how different load factors affect per-square-foot rent on a usable versus rentable basis.
    

At your service

## Square footage, defined precisely

LeasePilot generates premises descriptions with accurate BOMA-standard square footage references built into every lease.

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