Jia (Taiwan) to Bigha (Uttar Pradesh / Bihar, Pucca): the quick answer
To convert jia (Taiwan) to bigha (Uttar Pradesh / Bihar, pucca), multiply the value by 3.83475. To go the other way, multiply bigha (Uttar Pradesh / Bihar, pucca) by 0.260773 to get jia (Taiwan).
↔ Convert bigha (Uttar Pradesh / Bihar, pucca) to jia (Taiwan) instead