Bigha (Kaccha / Gujarat) to Bigha (Uttar Pradesh / Bihar, Pucca): the quick answer
To convert bigha (kaccha / Gujarat) to bigha (Uttar Pradesh / Bihar, pucca), multiply the value by 0.64. To go the other way, multiply bigha (Uttar Pradesh / Bihar, pucca) by 1.5625 to get bigha (kaccha / Gujarat).
↔ Convert bigha (Uttar Pradesh / Bihar, pucca) to bigha (kaccha / Gujarat) instead