Convert square meters, square feet, acres, hectares, and square kilometers. Select any specific conversion pair below to view the dedicated bidirectional calculator, exact formula, and full reference chart.
Formula: sq ft = m² * 10.7639. Live converter and full lookup chart.
Formula: m² = sq ft * 0.092903. Live converter and full lookup chart.
Formula: ha = ac * 0.404686. Live converter and full lookup chart.
Formula: ac = ha * 2.47105. Live converter and full lookup chart.
Formula: km² = sq mi * 2.58999. Live converter and full lookup chart.
Formula: sq mi = km² * 0.386102. Live converter and full lookup chart.
Physical measurements in modern science and commerce are anchored in the International System of Units (SI) maintained by the International Bureau of Weights and Measures (BIPM). Our conversion calculators use exact legal conversion constants defined by the National Institute of Standards and Technology (NIST) to ensure zero compound rounding error across high-precision calculations.