Sarsahi (Square Karam) to Bigha (Uttar Pradesh / Bihar, Pucca): the quick answer
To convert sarsahi (square karam) to bigha (Uttar Pradesh / Bihar, pucca), multiply the value by 0.00111111. To go the other way, multiply bigha (Uttar Pradesh / Bihar, pucca) by 900 to get sarsahi (square karam).
↔ Convert bigha (Uttar Pradesh / Bihar, pucca) to sarsahi (square karam) instead