Area Calculator
Measure the area and perimeter of a polygon.
How to use
- Paste a Polygon or MultiPolygon (coordinate list, WKT, or GeoJSON).
- Pick a unit — m², km², hectares, acres, or 평 (pyeong).
- Use the Batch (GeoJSON) tab to measure every polygon in an uploaded FeatureCollection at once.
- Area and perimeter are geodesic (great-circle), not a flat-plane approximation.
Input
Format detected: WKT
Unit
Area98,027,216.25 m²
Perimeter39.871 km
MeasurementGeodesic
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Area and Perimeter Measurement Coverage
Measures the geodesic area and perimeter of a Polygon or MultiPolygon using turf's spherical-excess calculation — not a flat-plane approximation that treats degrees as meters. Units include m², km², hectares, acres, and 평 (exactly 400/121 m²).
The Batch (GeoJSON) tab measures every polygon in an uploaded FeatureCollection at once.
How to use it
- Enter or draw the Polygon or MultiPolygon to measure.
- Choose the output unit — m², km², hectares, acres, or 평.
- To measure many polygons at once, upload a GeoJSON in the Batch tab.
Frequently asked questions
Can't I just treat degrees as meters?
No — a degree of longitude covers less real distance farther from the equator, so treating degrees as meters produces systematically wrong area outside the tropics.
Is 평 (pyeong) exactly 3.3 m²?
No — it's exactly 400/121 m² (≈3.3058 m²), and this tool uses that exact factor rather than the commonly rounded 3.3.