Convert from ping to square mile

Unit Definition (ping)
The ping is a traditional unit of area in Taiwan, equal to about 3.305 square meters (3.953 square yards). This is the same unit known in Korea as the pyong.

Unit Definition (square mile)
The square mile is a traditional unit of area. One square mile is equal to 640 acres, 3 097 600 square yards, 258.9988 hectares, or 2.589 988 square kilometers.