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square mile to square kilometre

Live square mile (mi²) to square kilometre (km²) converter. Plus a 10-value reference table and FAQs.

From mi²

square mile

To km²

square kilometre

1 mi² = 2.59km²

Conversion table

Ten sample values from square mile to square kilometre. Use the converter above for arbitrary values.

square mile (mi²)	→	square kilometre (km²)
0.001 mi²	→	0.00259 km²
0.01 mi²	→	0.0259 km²
0.1 mi²	→	0.258999 km²
0.5 mi²	→	1.294994 km²
1 mi²	→	2.589988 km²
2 mi²	→	5.179976 km²
5 mi²	→	12.949941 km²
10 mi²	→	25.899881 km²
100 mi²	→	258.998811 km²
1,000 mi²	→	2,589.98811 km²

About the square mile

640 acres. US county/area units.

About the square kilometre

100 hectares or 1,000,000 m². Country/city size.

How square mile to square kilometre conversion works

Both units belong to Area. Unitbox first expresses the input in the category reference unit (m²), then expresses that same quantity in square kilometre.

The right unit depends on the convention used by your industry, country, instrument, or source document.

Reference value1 mi² = 2.58998811 km²

CalculationBrowser-side, using Unitbox's shared unit data

Review noteFor safety-critical work, verify against the governing standard or instrument manual.

Unit definitions and conversion factors are maintained in the Unitbox methodology. Last reviewed with the current conversion dataset.