The area of the district is 1,820 square kilometers (700 sq mi).

[2] Its administrative center is the rural locality (a selo) of Kalmanka.

Kalmansky District is located in the north-central region of Altai Krai.

The terrain is mostly rolling agricultural plain of the Priobsky Plateau, with forests on the meandering floodplain of the Baruaulka River, which runs along the northern border of the district.

This climate is characterized by large swings in temperature, both diurnally and seasonally, with mild summers and cold, snowy winters.