Lot Size Calculator
Quick and accurate area calculations for real estate, construction, and landscaping
Calculate Lot Size
Click on the canvas to add points to your irregular lot. Double-click to complete.
Point Coordinates (feet)
No points added yet
Interactive Visualization
The visualization is approximate and not to scale. For accurate measurements, rely on the calculated values.
Square Footage
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Square Feet
Acreage
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Acres
Dimensions
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Property Value Estimator
Estimated Property Value
Comparative Values
Common Lot Sizes Reference
| Description | Dimensions (ft) | Square Feet | Acres | Typical Use |
|---|---|---|---|---|
| Standard City Lot | 50 × 100 | 5,000 | 0.115 | Small urban home |
| Quarter Acre Lot | ~104 × 104 | 10,890 | 0.25 | Suburban home |
| Half Acre Lot | ~147 × 147 | 21,780 | 0.5 | Large suburban home |
| One Acre Lot | ~208 × 208 | 43,560 | 1.0 | Rural/estate home |
| Basketball Court | 94 × 50 | 4,700 | 0.108 | Sports |
| Tennis Court | 78 × 36 | 2,808 | 0.064 | Sports |
| Football Field | 360 × 160 | 57,600 | 1.32 | Sports |
Practical Applications
Real Estate
Calculate accurate lot sizes for property listings, zoning requirements, and value assessment.
Example:
A real estate agent needs to list a property with a 75′ × 120′ lot:
- Area = 75 × 120 = 9,000 square feet
- Acreage = 9,000 ÷ 43,560 = 0.207 acres
- At $15/sq.ft, estimated value: $135,000
Construction
Plan building footprints, calculate material requirements, and ensure zoning compliance.
Example:
Building coverage calculation for zoning compliance:
- Lot size: 8,500 square feet
- Building footprint: 2,200 square feet
- Coverage ratio: 2,200 ÷ 8,500 = 25.9%
- Complies with 30% maximum coverage requirement
Landscaping
Determine material quantities for sod, mulch, irrigation, and hardscape elements.
Example:
Calculating sod needed for an irregularly shaped lawn:
- Lawn area: 3,200 square feet
- Sod comes in 2 sq.ft pieces
- Needed: 3,200 ÷ 2 = 1,600 pieces
- Add 10% for waste: 1,760 pieces
Formula Guide
Rectangle Area
A = L × W
Where:
- A = Area in square feet
- L = Length in feet
- W = Width in feet
Triangle Area
A = (B × H) ÷ 2
Where:
- A = Area in square feet
- B = Base length in feet
- H = Height in feet
Irregular Polygon
Shoelace Formula (Gauss’s Area)
Uses coordinates of vertices to calculate area of any polygon shape.
Conversions
Square Feet to Acres
Acres = Square Feet ÷ 43,560
1 acre = 43,560 square feet
Square Feet to Square Meters
Square Meters = Square Feet × 0.0929
1 square foot = 0.0929 square meters
Square Feet to Square Yards
Square Yards = Square Feet ÷ 9
1 square yard = 9 square feet
Frequently Asked Questions
How accurate is this lot size calculator?
This calculator provides precise mathematical results based on the dimensions you provide. However, the accuracy of your final result depends on the accuracy of your measurements. For legal purposes such as property transactions, always consult a professional land surveyor.
How do I measure my property boundaries?
For rough estimates, you can use a long measuring tape, measuring wheel, or laser distance meter. For accurate boundary measurements, refer to your property deed or survey. Many counties also provide GIS maps online that show property boundaries and dimensions.
What is the minimum lot size for building a house?
Minimum lot size requirements vary significantly by location and zoning regulations. Typically, urban areas may allow homes on lots as small as 2,500-5,000 square feet, while rural areas might require 1-5 acres or more. Check with your local zoning department for specific requirements.
How do easements affect lot size calculations?
Easements (such as utility access or shared driveways) are typically included in the total lot size, but they may restrict what portion of your property you can build on or use. The buildable area of your lot may be smaller than the total lot size due to easements, setbacks, and other restrictions.
How does lot size affect property value?
Lot size is one of many factors that influence property value. In general, larger lots command higher prices, but the relationship isn’t always linear. Location, shape, topography, zoning, and local market conditions also significantly impact value. In urban areas, even small differences in lot size can substantially affect value.
Related Real Estate & Land Calculators
Lot Size Calculator
Calculate the total area of your property lot in square feet.
Building Footprint
Determine the ground area covered by your building structure.
Fence Length
Calculate the total length of fencing needed for your property.
Driveway Area
Calculate the area of your driveway for material estimation.
Patio/Deck Area
Measure the square footage of outdoor living spaces.
Garden Bed Area
Calculate garden bed square footage for soil and mulch needs.
Pool Surface Area
Determine the surface area of your swimming pool.
Land Perimeter
Calculate the total boundary length of your property.
Zoning Setback
Determine required distance from property lines for building.
Easement Width
Calculate the width of easements on your property.