Free Zoning Density Calculator
Calculate the maximum number of dwelling units or building area allowed on a parcel based on zoning density regulations, minimum lot sizes, and setback requirements.
Maximum Allowed Units
22
Maximum Allowed Units vs Total Parcel Size (sq ft)
Zoning Density Calculations
Zoning regulations control how many dwelling units or how much building area can be placed on a given parcel. Density is limited by multiple factors, and the most restrictive one governs.
Density Limiters
1. Maximum density per acre: The zoning code specifies a maximum number of units per acre (e.g., 8 units/acre) 2. Minimum lot size: Each unit must have a minimum lot area (e.g., 7,200 sq ft) 3. Road and open space dedication: Typically 20-30% of the parcel is dedicated to roads, sidewalks, and open space 4. Setbacks and coverage: Building footprint limits further constrain density
Calculation Method
1. Subtract road/open space dedication from total parcel area 2. Calculate units by dividing net area by minimum lot size 3. Calculate units by multiplying acreage by maximum density 4. The lower number is the maximum allowed
Density Bonus Programs
Many jurisdictions offer density bonuses (10-35% more units) for including affordable housing, green building features, or transit-oriented design.
Example Calculation
5-acre parcel (217,800 sq ft), 7,200 sq ft minimum lot size, 25% road dedication, 8 units/acre maximum, 1,800 sq ft average unit.
- 01Parcel acreage: 217,800 / 43,560 = 5.0 acres
- 02Net buildable: 217,800 x 75% = 163,350 sq ft
- 03Units by lot size: 163,350 / 7,200 = 22 units
- 04Units by density: 5.0 x 8 = 40 units
- 05Maximum allowed: 22 units (limited by lot size)
- 06Total building area: 22 x 1,800 = 39,600 sq ft