Kattha (Nepal) to Bigha (Uttar Pradesh / Bihar, Pucca): the quick answer
To convert kattha (Nepal) to bigha (Uttar Pradesh / Bihar, pucca), multiply the value by 0.133884. To go the other way, multiply bigha (Uttar Pradesh / Bihar, pucca) by 7.46914 to get kattha (Nepal).
↔ Convert bigha (Uttar Pradesh / Bihar, pucca) to kattha (Nepal) instead