Polygon Area Calculator (Lat, Lng)
Paste latitude/longitude points from Google Maps in order around your boundary. Use one point per line in this format: lat, lng.
What this Google Maps area calculator does
This tool calculates the area enclosed by a set of latitude and longitude coordinates, just like measuring a plot on a digital map. If you use Google Maps to trace land parcels, farms, construction lots, campuses, or neighborhoods, you can copy those boundary points here and instantly get an area estimate in multiple units.
It uses geodesic math on a spherical Earth model, which makes it far more accurate than flat “paper” geometry when coordinates cover larger distances.
How to use the tool
1) Collect your points from Google Maps
Right-click each boundary corner in Google Maps and copy the coordinates. Keep the points in order as you move around the shape (clockwise or counterclockwise).
2) Paste one point per line
Use this format:
latitude, longitude- Example:
40.7128, -74.0060
3) Choose a preferred output unit
Select the unit you care about most (acres for land, square feet for smaller lots, hectares for agriculture, and so on).
4) Click calculate
The result panel displays:
- Primary area value in your selected unit
- All major area conversions
- Estimated perimeter distance
Common real-world use cases
- Real estate: estimate parcel size before listing or buying.
- Agriculture: estimate cultivated fields for planning and inputs.
- Construction: compare site footprint options.
- Landscaping: estimate turf, paving, or irrigation coverage.
- Education: teach map geometry and unit conversion.
Accuracy notes and best practices
All digital map measurements are estimates. Accuracy depends on the quality of your coordinate points and how carefully the shape is traced.
- Use more points for curved boundaries.
- Avoid self-intersecting shapes (figure-eight paths).
- Zoom in while collecting coordinates.
- For legal surveys, consult licensed professionals.
Unit reference quick guide
- 1 hectare = 10,000 m²
- 1 acre ≈ 4,046.856 m²
- 1 km² = 1,000,000 m²
- 1 mi² ≈ 2,589,988.110 m²
FAQ
Can I use this for small residential lots?
Yes. Choose square feet or acres for easy interpretation.
Can I use this for very large regions?
Yes, but include enough boundary points to represent the shape faithfully. Large coarse polygons can under- or over-estimate irregular boundaries.
Does this replace official land surveys?
No. It is excellent for planning and estimation, not legal boundary certification.