According to the 2011 Census of Bangladesh, Kalai Upazila had 38,745 households and a population of 143,197.

Kalai had a literacy rate (age 7 and over) of 49.82%, compared to the national average of 51.8%, and a sex ratio of 1021 females per 1000 males.

The union parishads are subdivided into 109 mauzas and 148 villages.

[8] Kalai Municipality is subdivided into 9 wards and 34 mahallas.

This Rajshahi Division location article is a stub.