Square Kilometers to Square Miles (km² to mi²) Converter – Area Conversion Tool

Convert square kilometers to square miles and square miles to square kilometers. Free online area converter tool for geographic areas, city planning, and more.
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Square Kilometers to Square Miles (km² to mi²) – Instant Calculator

Square Kilometers (km²)

km²

⇄

Convert

Square Miles (mi²)

mi²

Common Conversions

1 km² = 0.386102 mi²

5 km² = 1.93051 mi²

10 km² = 3.86102 mi²

25 km² = 9.65255 mi²

50 km² = 19.3051 mi²

100 km² = 38.6102 mi²

250 km² = 96.5255 mi²

500 km² = 193.051 mi²

About Square Kilometers to Square Miles Conversion

Square kilometers to square miles conversion is essential for large area measurements in geography, urban planning, and environmental studies. Our converter supports instant conversion between metric (km²) and imperial (mi²) area units with exact accuracy.

Popular Area Conversions

Square Kilometers to Square Miles: 1 km² = 0.386102 mi²
Square Miles to Square Kilometers: 1 mi² = 2.58999 km²
10 Square Kilometers: 10 km² = 3.86102 mi²
100 Square Kilometers: 100 km² = 38.6102 mi²

Square Kilometers to Square Miles: Definition, History, Uses, and Examples

Definition

Square Kilometers (km²) and Square Miles (mi²) are units of area measurement. One square kilometer equals exactly 0.386102 square miles, making this conversion precise and reliable for large geographic area calculations.

Origin or History

The square kilometer is derived from the metric system, where 1 kilometer equals 1000 meters. Square miles are part of the imperial system, historically used for large land measurements. The conversion factor 0.386102 comes from the exact relationship between these two systems, ensuring mathematical precision for geographic calculations.

Current Use

Geography & mapping: Convert country and region areas from km² to mi².
Urban planning: Translate city and metropolitan area measurements.
Environmental studies: Calculate ecosystem and protected area sizes.
Transportation planning: Convert highway and infrastructure project areas.
International comparisons: Bridge metric and imperial area specifications.

Examples and Quick Answers

Query	Answer	Notes
How many mi² in 5 km²?	1.93051 mi²	5 × 0.386102
25 km² to mi²	9.65255 mi²	25 × 0.386102
100 mi² to km²	258.999 km²	100 ÷ 0.386102
1 km² in mi²	0.386102 mi²	Exact conversion
500 km² to mi²	193.051 mi²	500 × 0.386102
1000 mi² to km²	2589.99 km²	1000 ÷ 0.386102

Step-by-step example

Convert 15 km² to mi²: 15 × 0.386102 = 5.79153 mi². For the reverse, divide mi² by 0.386102 to get km².

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Frequently Asked Questions

How to convert square kilometers to square miles for geographic area planning and mapping projects?

For geographic planning, multiply square kilometers by 0.386102 to get square miles. This is essential when creating maps, planning regional development projects, and comparing international geographic areas for planning and analysis purposes.

What is the exact conversion factor for square kilometers to square miles in urban development projects?

The exact conversion factor is 0.386102 square miles per square kilometer. This precise ratio is crucial for urban development projects, city planning, and infrastructure design where accuracy is required for zoning regulations and development permits.

When do I need to convert square kilometers to square miles for environmental impact assessment studies?

Environmental impact assessments require square kilometers to square miles conversion for habitat analysis, protected area designation, and ecosystem mapping. This ensures compliance with international environmental standards and facilitates cross-border conservation planning.

How accurate is the square kilometers to square miles converter for transportation infrastructure planning?

Our converter uses the internationally recognized conversion factor of 0.386102, making it suitable for transportation infrastructure planning, highway corridor analysis, and airport development where precision is essential for engineering design and cost estimation.

Can I convert square miles back to square kilometers for international geographic comparisons?

Yes! For international comparisons, divide square miles by 0.386102 to get square kilometers. This is useful when analyzing geographic data from different countries and converting specifications back to metric units for global research and planning.