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Square Miles
A square mile (mi²) is an imperial unit of area, commonly used for large land areas like cities, counties, and countries in the US.
Square Kilometers
A square kilometer (km²) is a metric unit of area equal to one million square meters, used for large areas like cities and countries.
Square Meters
A square meter (m²) is the metric unit of area equal to a square with 1-meter sides, commonly used for floor space and property.
Square Feet
A square foot (ft²) is an imperial unit of area equal to a square with 1-foot sides, commonly used for real estate and room sizes.
Acres
An acre is a unit of land area used in the imperial and US customary systems, historically defined as the area a yoke of oxen could plough in a day. It's commonly used for land and real estate.
Hectares
A hectare (ha) is a metric unit of area equal to 10,000 square meters, commonly used for land, farms, and forests.