1 Acre = 4 Bigha (Standard)
1 Hectare = 2.47 Acres
1 Bigha = 20 Biswa (UP, Rajasthan)
1 Acre = 40 Guntha
Bigha size varies by state:
UP: 1 Bigha = 0.62 Acre
Rajasthan: 1 Bigha = 0.625 Acre
Punjab: 1 Bigha = 1 Acre
West Bengal: 1 Bigha = 0.33 Acre
1 Square Meter = 10.76 Sq Ft
1 Ground = 2,400 Sq Ft
1 Kanal = 5,445 Sq Ft
1 Marla = 272.25 Sq Ft