Area Converter

Convert the standard squared metric sequence, hectares, acres, and common imperial area units.

This calculator is useful when you need a quick unit check without working through each conversion factor by hand. Enter one value to compare every supported unit side by side.

Area Converter

Enter an area and choose its starting unit. From kilometer through millimeter, each adjacent decimal length step produces a 100-fold area step. Micrometer and nanometer scales follow afterward, then common land and imperial units.

Use decimals or scientific notation.
UnitSymbolConversion factor1 =
square kilometerkm²1 km² = 1 × 106 1 × 10−6km²
square hectometerhm²1 hm² = 10,000 0.0001hm²
square decameterdam²1 dam² = 100 0.01dam²
square meter1 = 1 1
square decimeterdm²1 dm² = 0.01 100dm²
square centimetercm²1 cm² = 0.0001 10,000cm²
square millimetermm²1 mm² = 1 × 10−6 1 × 106mm²
square micrometerµm²1 µm² = 1 × 10−12 1 × 1012µm²
square nanometernm²1 nm² = 1 × 10−18 1 × 1018nm²
hectareha1 ha = 10,000 0.0001ha
area1 a = 100 0.01a
acreacre1 acre = 4,046.8564 0.00024710538acre
square yardyd²1 yd² = 0.83612736 1.19599yd²
square footft²1 ft² = 0.09290304 10.76391ft²
square inchin²1 in² = 0.00064516 1,550.0031in²
Method: convert the input to the base unit first, then convert from that base unit to each target unit. The base unit is square meter ().

When an area converter is useful

Area conversions are common in property records, landscaping, construction, mapping, agriculture, laboratory surfaces, and classroom geometry. Because area units are squared, their conversion factors are not the same as ordinary length factors.

From kilometer through millimeter, each adjacent decimal metric length step changes by 10, so each corresponding squared area step changes by 100. For example, 1 m² equals 100 dm².

Below millimeter, standard SI prefixes jump to micrometer and nanometer. Those larger prefix jumps produce correspondingly larger changes in squared area.

Example

Enter 1 hectare to see that it equals 1e4 square meters, about 2.471 acres, and about 1.07639e5 square feet.