Abstract: The mechanical acreage counter of the present invention is connected to a shaft of a planter unit which rotates only when seed is being planted therefrom. The counter includes a first gear connected to the shaft for rotation therewith, a bracket adjustably connected to the framework of the planter unit, and an odometer having a second gear in meshing combination with the first gear for sequentially rotating the numbered wheels within the odometer. The two gears are always in mesh so as to minimize wear upon the counter and to improve accuracy thereof.