Mẫu (Northern Vietnam) to Bigha (Uttar Pradesh / Bihar, Pucca): the quick answer
To convert mẫu (northern Vietnam) to bigha (Uttar Pradesh / Bihar, pucca), multiply the value by 1.42333. To go the other way, multiply bigha (Uttar Pradesh / Bihar, pucca) by 0.702579 to get mẫu (northern Vietnam).
↔ Convert bigha (Uttar Pradesh / Bihar, pucca) to mẫu (northern Vietnam) instead