Measure the area and perimeter of any region on Earth — land plots, farm fields, property boundaries, construction sites, or any custom shape. Draw a polygon by clicking on the map, and area is calculated instantly in your choice of units: km², m², square miles, acres, or hectares. Perimeter is shown on each side of the polygon in real time. All calculations use geodesic math on the WGS84 ellipsoid (the same standard as GPS), so results stay accurate at any scale and any location on Earth.
Click on the map to place the first vertex of your polygon.
Keep clicking to trace the boundary of your area.
Double-click — or click the first point — to close and complete the shape.
Area and perimeter appear instantly in the panel.
Drag any numbered pin marker to fine-tune a vertex position.
Click anywhere on a polygon side to insert a new vertex at that spot.
Click a vertex row in the list to jump the map to that point.
Edit a vertex's coordinates directly by clicking the edit icon.
Switch area units (km², m², mi², ac, ha) and perimeter units (km, m, mi, ft, nm) independently.
Press Ctrl+Z while drawing to undo the last placed vertex.
Geodesic area via Turf.js on the WGS84 ellipsoid — GPS-accurate at any scale
Vincenty formula perimeter — sub-millimeter theoretical accuracy
Area units: km², m², mi², acres (ac), hectares (ha)
Perimeter units: km, m, mi, ft, nautical miles (nm) — set independently
Per-side distance labels shown live on the map
Drag numbered pin markers to reshape after drawing
Click any polygon side to insert a new vertex
Real-time area & perimeter tooltip while drawing and editing
Edit or copy any vertex coordinate from the list
Keyboard: Ctrl+Z undo vertex while drawing, Esc to clear