Square Miles to Fen (Area, China): the quick answer
1 mi² = 38,849.8 fen
1 square mile equals 38,849.8 fen (area, China)
To convert square miles to fen (area, China), multiply the value by 38,849.8. To go the other way, multiply fen (area, China) by 2.57401 × 10⁻⁵ to get square miles.