Calamias used to be loosely called “Putol” because a road ran across it as through cutting it into two parts. The barrio was later renamed Calamias because its earliest settlers noticed an abundance of bilimbi trees growing in the area. It was officially established as barrio in the middle of the nineteenth century. The original settlers in Calamias were the Macatangay, Rabino and Ramos families. During the Spanish era, the Guardia Civil kept something of a concentration camp in the barrio to separate bandits or tulisanes from ordinary folks.
Calamias is situated at approximately 13.8603, 121.1512, in the island of Luzon. Elevation at these coordinates is estimated at 183.2 meters or 601.0 feet above mean sea level.