About the Polygon Area Calculator Online Free Tool

The Polygon Area Calculator Online Free Tool estimates polygon area and perimeter from a list of latitude/longitude vertices using a local projected approximation.

How to Use the Polygon Area Calculator Online

1. Enter one polygon vertex per line as latitude,longitude.
2. List points around the boundary in order.
3. Run the calculator to review approximate area and perimeter.

Choosing Options Correctly

Use ordered vertices and avoid self-crossing polygons. This is best for smaller areas; large regions, polar areas, and legal survey work need proper geodesic or projected GIS tools.

Common Use Cases

• Estimate area from GPS boundary points.
• Check a small field or site perimeter.
• Validate a polygon before moving to GIS software.

Quick FAQ

Do I need to repeat the first point at the end?
No. The calculator closes the polygon internally.

Do points need to be in order?
Yes. Enter boundary points around the polygon. Random point order can create a crossed polygon and bad area.

Is this suitable for cadastral or legal area?
No. Use approved survey methods and project coordinate systems for legal measurements.

Does this handle irregular shapes?
Yes, if the boundary is represented by enough ordered points. Curves must be approximated with points.