Square Miles to Square Kilometers Converter

Enter the value above and the result appears instantly — the calculation runs entirely in your browser. Formula: value × 2.58999.

1 square mile = 2.58999 square kilometers (shown to 6 significant figures — the converter itself computes at full precision). The reverse factor is 1 square kilometer = 0.386102 square miles.

1 mi² = 2.58999 km²; 10 mi² = 25.8999 km²; 100 mi² = 258.999 km². Use the full conversion table below for more reference values.

A hectare is metric and equals exactly 10,000 m² (100 m × 100 m). An acre is 4,046.8564224 m², or 43,560 sq ft. That makes 1 hectare = 2.47105 acres. Land in the US is usually listed in acres; most other countries use hectares.