Convert from tatami to square kilometer

Unit Definition (tatami)
The tatami is a Japanese unit of area equal to the area of a traditional tatami mat, 0.5 ken by 1 ken or about 90 centimeters by 180 centimeters (roughly 1.62 square meters or 17.5 square feet). This unit, used especially for measuring the area of rooms in houses and apartments, is also called the jo.

Unit Definition (square kilometer)
The square kilometer is a common metric unit of area. One square kilometer equals 100 hectares, 10E6 square meters, approximately 247.105 acres, or approximately 0.386 102 square mile.