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When calculating Units of Area, each larger unit is 100 times bigger than the smaller unit. That’s because area is determined by multiplying the one side of a square area by the adjoining side. So a rectangle that is 10 millimeters on a side has an area of 10 millimeters X 10 millimeters or 100 square millimeters, or one square centimeter (10 mm X 10 mm = 100 sq. mm = 1 sq. cm. Also written as 1 cm2).
Units of Area - International Measure
US Unit
 
Metric Unit
 
Metric Unit
 
US Unit
1 Square Inch = 6.4516 Square Centimeters   1 Sq. Centimeter = 0.1550003 Square Inches
1 Square Foot = 929.0304 Square Centimeters   1 Square Centimeter = 0.001076391 Square Feet
1 Square Yard = 0.83612736 Square Meters   1 Square Meter = 1.195990 Square Yards
1 Acre = 0.4046873 Hectares   1 Hectare = 2.471044 Acres
1 Square Mile = 258.9998 Hectares   1 Hectare = 0.003861006 Square Miles