Atlas Compare
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Free area conversion · browser-based

Convert square miles, km², acres and hectares.

Enter a value and choose its unit to see the same area expressed in five common units. No sign-up, API key or upload.

Enter a positive number. Decimals are supported.

Equivalent area

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All outputs use standard unit conversion factors; values are rounded for display.

Square kilometres
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Square miles
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Hectares
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Acres
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Square feet
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How area conversion works

The entered value is first converted to square kilometres, then converted from that common base into the other units. For example, 1 square mile equals approximately 2.589988 square kilometres. Display rounding does not change the underlying calculation.

Need density instead? Use the population-density calculator and read how its denominator is defined. For map comparisons, see why land area and total area can differ or compare cited places on the interactive map.