Square Meters to Mẫu (Northern Vietnam): the quick answer
1 m² = 0.000277778 mẫu-b
1 square meter equals 0.000277778 mẫu (northern Vietnam)
To convert square meters to mẫu (northern Vietnam), multiply the value by 0.000277778. To go the other way, multiply mẫu (northern Vietnam) by 3,600 to get square meters.