Square Millimeters to Bigha (Uttar Pradesh / Bihar, Pucca): the quick answer
To convert square millimeters to bigha (Uttar Pradesh / Bihar, pucca), multiply the value by 3.95369 × 10⁻¹⁰. To go the other way, multiply bigha (Uttar Pradesh / Bihar, pucca) by 2,529,290,000 to get square millimeters.
↔ Convert bigha (Uttar Pradesh / Bihar, pucca) to square millimeters instead