The Land Area Calculator app will help you to calculate the land area. You will have to select the input unit output unit and select the number of sides.

This app has 5 input unit:
feet
meters
yards
kilo meters
miles

This app has 37 output unit in two categories:
global :
Square Centimeters
Square Feet
Square Inch
Square Kilometer
Square Meter
Square Mile
Square Yard
Hectare
Decimal
Cent
Acre
Are
Centiare

Asian :
Ankanam
Chatak
Lat
Bega
Karam
Ghumaon
Ground
Guntha
Kanal
Killa
Kranta
Kuncham
Lecha
Marla
Murabba
Nalli
Perch
Rood
Sarsahi (Square Karam)
Shatak
Bigha
Biswa
Dhur
Kattha

You can calculate 4 sides/3sides/5sides lands area. In this app you can also calculate the area for different shapes like triangle square rectangle trapezoid rhombus parallelogram quadrilateral polygon circle and ellipse.