▣ Area Conversion

Convert between area units for real estate, construction, agriculture, and science. Supports square meters (m²), square feet (ft²), square kilometers (km²), acres (ac), hectares (ha), square inches (in²), square yards (yd²), square miles (mi²), and scientific units like barns.

Area conversion calculates two-dimensional geometric space across metric and imperial customary measures. Governed by NIST SP 811, 1 square meter (m²) equals exactly 10,000 square centimeters or approximately 10.7639 square feet. 1 acre is defined as exactly 43,560 square feet (approx. 4,046.86 m² or 0.4047 hectares).

Metrological Standards & Base Equation

1 square meter = 10.7639 square feet. 1 acre = 0.404686 hectares. 1 hectare = 107,639 square feet.

Area conversions follow NIST Special Publication 811 definitions derived directly from international linear dimensions. Agricultural land measures adhere to the International Acre standard (codified following the 2023 NIST deprecation of the US survey foot).

Primary References: NIST SP 811 (2008 Edition) · BIPM SI Brochure (2019) · Standards Directory

Supported Area Units (12 Total)

Area Unit Definitions and Scaling Factors
Unit Symbol Unit Name System Equivalent in Square Meter
mm² Square Millimeter Metric 1 mm² = 0.000001 m²
cm² Square Centimeter Metric 1 cm² = 0.0001 m²
m² Square Meter Metric Reference Standard (1 m²)
km² Square Kilometer Metric 1 km² = 1000000 m²
in² Square Inch Imperial 1 in² = 0.00064516 m²
ft² Square Foot Imperial 1 ft² = 0.092903 m²
yd² Square Yard Imperial 1 yd² = 0.836127 m²
ac Acre Imperial 1 ac = 4046.86 m²
ha Hectare Metric 1 ha = 10000 m²
mi² Square Mile Imperial 1 mi² = 2590000 m²
twp Township Imperial 1 twp = 93240000 m²
barn Barn Scientific 1 barn = 1.000000e-28 m²

Popular Area Conversions

Square Meters to Square Feet

m² → ft² — real estate & property listings

Acres to Hectares

ac → ha — farmland & land measurement

Square Feet to Square Meters

ft² → m² — international property comparison

Hectares to Acres

ha → ac — agricultural land

Square Kilometers to Square Miles

km² → mi² — country & region areas

Common Use Cases

  • Real estate & property (m²↔ft²)
  • Agriculture & land (ac↔ha)
  • Construction & flooring (ft²↔m²)
  • Geography & mapping (km²↔mi²)
  • Science (barn, mm²)

Frequently Asked Questions

How many square feet in a square meter?

One square meter equals 10.7639 square feet. Multiply m² by 10.7639 to get ft².

How many acres in a hectare?

One hectare equals 2.47105 acres. Multiply hectares by 2.47105 to get acres.