Convert square miles to square kilometers

Square mile

A square mile is a customary area unit equal to a square one mile long and one mile wide.

Square miles are used in US geography, land statistics, and public descriptions of large areas.

mi2 is common for cities, counties, parks, states, watersheds, reserves, and regional area comparisons.

Square kilometer

A square kilometer is a metric area unit equal to one million square meters.

Square kilometers are widely used in international geography, mapping, environmental reporting, and public statistics.

km2 is used for cities, districts, parks, lakes, reserves, watersheds, and other large mapped surfaces.

How to Convert Square mile to Square kilometer

Mathematically, square kilometer (km²) = square mile (mi²) converted with the formula below.

1 mi² = 2.589988 km²

1 km² = 0.386102 mi²

Formula: value × 2.58998811034

Example: 15 mi² = 38.849822 km²

1. Start with the source area in square miles (mi2).
2. Multiply by 2.58998811034 to convert the same area into square kilometers (km2).
3. Use the km2 result for metric map comparisons, international reports, or public geography summaries.

Precision note: Use the full mi2 to km2 factor for calculations. Round the final km2 value based on the precision of the original boundary or area source.

How many mi² in km² and km² in mi²

1 mi² = 2.589988 km²

1 km² = 0.386102 mi²

Common Use Cases for mi² to km²

• Converting city, county, state, park, or reserve areas from mi2 into km2.
• Preparing metric geography summaries from US customary area data.
• Comparing square-mile land statistics with international datasets that use km2.
• Checking whether a large area conversion used the square-mile factor rather than the mile-to-kilometer length factor.

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