Square Mile to Square Kilometer Converter

Area Converter

20 units available

Decimals:

From

To

2.589988

1 mi² = 2.589988 km²

Formula:

km² = mi² × 2.5899881103

With your value: 1 mi² = 2.58998811 km²

How big is that?

Everyday references on a logarithmic scale, all expressed in square mile so you can sanity-check the result.

Parking space (1/2.1e+5 your value)0.00000483 mi²

Tennis court (1/9.9e+3 your value)0.000101 mi²

Football pitch (1/3.6e+2 your value)0.00276 mi²

Hectare (1/2.6e+2 your value)0.00386 mi²

Your value1.00 mi²

Central Park (1.3× your value)1.32 mi²

Other Square Mile to Square Kilometer conversions

2 mi² to km² 3 mi² to km² 4 mi² to km² 5 mi² to km² 6 mi² to km² 7 mi² to km² 8 mi² to km²

Square Mile to Square Kilometer Conversion Table

Square Mile (mi²)	Square Kilometer (km²)
0.5	1.294994
1	2.589988
2	5.179976
5	12.949941
10	25.899881
15	38.849822
20	51.799762
25	64.749703
50	129.499406
100	258.998811
250	647.497028
500	1,294.994055
1000	2,589.98811

Square Kilometer to Square Mile Conversion Table

Square Kilometer (km²)	Square Mile (mi²)
0.5	0.193051
1	0.386102
2	0.772204
5	1.930511
10	3.861022
15	5.791532
20	7.722043
25	9.652554
50	19.305108
100	38.610216
250	96.52554
500	193.051079
1000	386.102159

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Square Mile (mi²)

Area

Exact conversion

Derived from the square metre via the length definitions above.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Square Kilometer (km²)

Area

Exact conversion

Derived from the square metre via the length definitions above.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Square Mile to Square Kilometer

To convert from Square Mile (mi²) to Square Kilometer (km²), multiply the value by 2.5899881103.

Formula: km² = mi² × 2.5899881103

Reverse: mi² = km² × 0.3861021585

Step-by-Step Example

Start with your value in Square Mile. For example: 5 mi²
Multiply by the conversion factor: 5 x 2.5899881103
The result is: 12.949941 km²

About Square Mile

The square mile equals 640 acres or about 2.59 square kilometres, and is the standard unit for US county, city and land-survey areas.

Common uses: census areas, land surveys, geography.

About Square Kilometer

The square kilometer (km²) is a unit of area. One square kilometer equals 1.000000 × 10^+6 square metres. UnitConvertLab converts it against every other area unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: area calculations, engineering and science, education.

Frequently Asked Questions

How many Square Kilometer are in 1 Square Mile?

There are exactly 2.5899881103 Square Kilometer in 1 Square Mile. This means the conversion factor from Square Mile to Square Kilometer is 2.5899881103.

What is the formula to convert Square Mile to Square Kilometer?

The formula to convert Square Mile to Square Kilometer is: km² = mi² × 2.5899881103. For example, to convert 10 Square Mile to Square Kilometer, you would multiply 10 by 2.5899881103.

What is a Square Mile?