A free program for Android, by KBK INFOSOFT.

Gps Area Calculator allows you to easily measure any place like a park, city, and many more. It measures different unit scales such as the hectare, acre, square meter, and square kilometer. meter, feet (ft), yard (yd), and mile (mi). You can also check the distance, area, and point of interest (POI), and mark the related location using a smart marker mode for accurate pin placement. You can also back up and restore the map list.

This app also features new GPS tools you can use such as GPS compass, GPS speedometer, location save, and share. The geo area is for agronomists, town planners, construction surveyors, asset mapping, and many more.