Square Miles to Bigha (Kaccha / Gujarat): the quick answer
1 mi² = 1,600 bigha-k
1 square mile equals 1,600 bigha (kaccha / Gujarat)
To convert square miles to bigha (kaccha / Gujarat), multiply the value by 1,600. To go the other way, multiply bigha (kaccha / Gujarat) by 0.000625 to get square miles.