It is located in the province of Southern Finland and is part of the Tavastia Proper region. The municipality had a population of 3,449 (2003) and covered an area of 338.81 km² of which 38.75 km² is water. The population density was 10.2 inhabitants per km². Kalvola is best known for its Iittala glass factory.
The municipality was unilingually Finnish.
NHLer Hannu Toivonen was born here.