Kalmahr

is a village in Farahabad-e Jonubi Rural District of Rudpey-ye Shomali District in Sari County, Mazandaran province, Iran.

==Demographics== ===Population=== At the time of the 2006 National Census, the village's population was 452 in 119 households, when it was in Rudpey-ye Shomali Rural District of the Central District. The following census in 2011 counted 345 people in 104 households, by which time the rural district had been separated from the district in the formation of Rudpey District. The 2016 census measured the population of the village as 352 people in 119 households, when the rural district had been separated from the district in the formation of Rudpey-ye Shomali District and renamed Farahabad-e Shomali Rural District. The village was transferred to Farahabad-e Jonubi Rural District created in the new district.