Map Area Calculator — Draw a Shape, Get the Acres

How to measure area on a map

1. Zoom to the plot and click its first corner.
2. Keep clicking around the boundary in order — clockwise or counterclockwise, both work. The shape fills in once you have three corners.
3. Drag any corner to snap it precisely onto the boundary. Undo corner removes the last point if you overshoot.
4. Read the area in your preferred unit from the result card — all six units are shown at once, so there is no unit conversion to do by hand.

Areas are computed with a spherical-excess formula on the Earth's surface, which matches what survey-grade tools report for plots up to several square miles. For parcels smaller than a city lot, the number you get is limited by how precisely you place the corners rather than by the math.

How big is an acre, really?

An acre is 43,560 square feet — roughly a square 208.7 feet on a side, or about 70% of a soccer field. It is not a square by definition, though: any shape adding up to 43,560 sq ft counts, which is why long, narrow “ribbon” lots can still be listed as an acre.

Need a circle instead of a drawn shape? The radius map tool shows the area covered by any radius — useful for “how many acres does my 10-mile delivery zone cover?” style questions.