Zoning Density Calculator
Calculate maximum units per acre based on zoning code density limits and minimum lot sizes.
Inputs
acres
DU/acre
SF
%
SF
Results
Max Allowed Units
84
Effective Density
5.6 DU/acre
Units (Density Limit)120
Units (Lot Size Limit)84
Net Density8.62 DU/acre
Net Buildable Acres9.75
Floor Area Ratio0.23
Max Building Footprint75,600 SF
How to Use This Calculator
- Enter Total Site Acreage and Maximum Units per Acre from the zoning code.
- Set Minimum Lot Size in square feet as an additional constraint.
- Enter Net-to-Gross Ratio % — the share of gross area that is net buildable after infrastructure deductions.
- Set Average Unit Size in square feet and Number of Stories.
- Review Max Allowed Units — the lesser of the density-based and lot-size-based limits.
- Use Effective Density in your pro forma and compare against market-rate development in the area.
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