Square kilometer to Square mile Converter (and vice versa)
Created by: tinycalcs.com/en
Number of supported units: 2
Last update: 2026
This converter allows you to convert square kilometers [km²] to square miles [mi²] or square miles [mi²] to square kilometers [km²]. Calculations are performed in both directions. The calculation result and the entered value are displayed with up to 20 decimal places for maximum accuracy.
Convert square kilometers to square miles
There are two simple ways to convert square kilometers [km²] to square miles [mi²]. In the first calculation method, the value in square kilometers [km²] is divided by the rounded conversion factor of 2.59. The second method multiplies the value in square kilometers [km²] by the rounded conversion factor of 0.3861.
- Square miles [mi²] ≈ square kilometers [km²] ÷ 2.59
- Square miles [mi²] ≈ square kilometers [km²] * 0.3861
However, rounded conversion values are only suitable for rough conversions, as rounding errors can occur in the calculation result. The most accurate conversion of square kilometers [km²] to square miles [mi²] can be achieved using the following calculation method.
- Square miles [mi²] = square kilometers [km²] ÷ 1,609,3442 * 1012
Convert square miles to square kilometers
Converting square miles [mi²] to square kilometers [km²] is easy and can be done in two ways. The first method involves multiplication, in which the value in square miles [mi²] is multiplied by the rounded conversion factor of 2.59. The second variant is a division. Here, the value in square miles [mi²] is divided by the rounded conversion factor of 0.3861.
- Square kilometers [km²] ≈ square miles [mi²] * 2.59
- Square kilometers [km²] ≈ square miles [mi²] ÷ 0.3861
However, rounded conversion values do not allow for exact calculations because rounding errors can occur in the calculation result. The most accurate conversion of square miles [mi²] to square kilometers [km²] can be achieved using the following calculation method.
- Square kilometers [km²] = square miles [mi²] * 1,609,3442 ÷ 1012
Converter
Decimal places
How it's calculated
To all available units
Square kilometers
Square nanometers
Square kilometers
Square yards
Square meters
Acres
Square meters
Ares
Square meters
Hectares
Popular with other users …
Capacitance
Capacitors usually have values significantly smaller than one farad, which is why capacitance values with SI prefixes are particularly common. The capacitance converter is ideal for converting between different units of electrical capacitance.
Capacitance converter
Current
Manually converting between non-standard electricity units can be confusing and prone to errors. The electricity converter simplifies this process by eliminating complexity and providing accurate, error-free results.
Current converter
Data transfer rate
Data transfer speeds can be expressed in numerous units. Converting between these units can be confusing and often leads to calculation errors. The data transfer converter eliminates the complexity and delivers accurate results.
Data transfer rate converter
Digital storage
The capacity of a hard drive is usually specified in gigabytes or terabytes. However, it is also possible to use gibibytes or tebibytes, which can lead to confusion when converting. The digital storage converter is ideal for converting different data units.
Digital storage converter