Bigha (Uttar Pradesh / Bihar, Pucca) to Bigha (Assam): the quick answer
To convert bigha (Uttar Pradesh / Bihar, pucca) to bigha (Assam), multiply the value by 1.89063. To go the other way, multiply bigha (Assam) by 0.528926 to get bigha (Uttar Pradesh / Bihar, pucca).
↔ Convert bigha (Assam) to bigha (Uttar Pradesh / Bihar, pucca) instead