Map Area & Distance Calculator
Measure the area of a plot or the distance of a route by clicking on a map. Geodesic results in m², hectares, acres, dunams, km and miles.
How it's calculated
Click the map to add points. In Area mode the points form a polygon; in Distance mode they form a path.
- Area is measured on the curved surface of the Earth (spherical excess on the WGS 84 radius), the method used by Turf.js and most web maps. It's accurate to about 0.5%, ample for plots, parks and districts, but not a substitute for a surveyed site plan.
- Distance follows great circles between the points (haversine formula), so long lines are measured correctly, not along the flat map.
- Results are shown in metric, imperial and local units, including dunams (1,000 m²).
The map uses free OpenFreeMap tiles built from OpenStreetMap data. Your points are not sent anywhere; only map tiles are downloaded.
Frequently asked questions
How accurate is the area?
It's measured on the Earth's curved surface and is accurate to about 0.5%. How carefully you place the points matters more: zoom in to place corners precisely. For legal boundaries, use a surveyed plan.
Can I use it without a mouse?
Yes. Type a point's latitude and longitude in the box under the map and add it; the list of points can be undone or cleared with buttons.
Are my points saved or sent anywhere?
No. The measurement happens in your browser; only the map tiles are downloaded.