Jō (Tatami Mats, Japan) to Bigha (Uttar Pradesh / Bihar, Pucca): the quick answer
To convert jō (tatami mats, Japan) to bigha (Uttar Pradesh / Bihar, pucca), multiply the value by 0.000640497. To go the other way, multiply bigha (Uttar Pradesh / Bihar, pucca) by 1,561.29 to get jō (tatami mats, Japan).
↔ Convert bigha (Uttar Pradesh / Bihar, pucca) to jō (tatami mats, Japan) instead