How to measure acreage on the map
This page opens in area mode, in acres, with every side’s length written on the map in feet. Search for the town or paste the coordinates of the property, zoom in until you can see the fence lines, field edges or the house, then tap each corner of the land in order around its edge. After the third corner the outline closes and the acreage appears under the map, with the same area in hectares, square feet and square metres beside it.
Zoom matters more than anything else. At the closest zoom a pixel is a fraction of a metre, so put the corners there; zoomed out over a whole farm, one pixel can be tens of metres and the edges lose detail. Drag any corner to adjust it, tap the dot halfway along a side to add a bend, and use Undo if a tap lands in the wrong place.
Reading the result
The headline is the land area in acres, measured along the curve of the Earth on the WGS84 ellipsoid, so a large ranch is as accurate as a suburban lot. The perimeter under it is the length of the boundary, and the table lists each side with its compass bearing, which helps to match the outline against the calls in a deed (“north 12° east, 208.7 feet”).
Some quick comparisons: a quarter-acre lot is 10,890 square feet, and 640 acres make a square mile. One hectare is about 2.471 acres.
Next steps
Download the outline as KML to open it in Google Earth, or as GeoJSON for a GIS, or copy the results with the coordinates of every corner. Share result makes a link that opens the same outline for a neighbour, an agent or a contractor. If the size matters legally, compare it with your plat or survey, which defines the true boundary.