Square Kilometers to Square Miles Converter
This tool converts square kilometers to square miles, helping you present geographic data in terms familiar to American audiences.
Why Convert
Comparing Countries
Understanding the News
How to Use the Converter
Enter the Value
Enter the geographic area in square kilometers in the left field.
Read the Result
The US-friendly result in square miles appears instantly on the right.
Copy or Swap
Copy the value for articles or presentations, or swap to convert square miles back to square kilometers.
Converter Features
Instant Real-Time Conversion
The result updates the moment you type. There is no calculate button, so you can compare several values in seconds.
Bidirectional Swap
Press the swap button between the two fields to reverse the direction instantly, without reloading the page or re-typing.
Searchable Unit Picker
Each unit dropdown has a search box, so you can switch to any other area unit and convert in a different direction whenever you need.
One-Click Copy
A copy button sits beside each field. Tap it to send the value straight to your clipboard for reports, listings, or spreadsheets.
Quick Reference & Unit Info
A built-in quick-reference grid and unit info cards show common values and where each unit is used, right below the converter.
Mobile-Optimized Design
Large touch targets and a responsive layout make conversions easy on a phone, whether on-site, in a store, or on the go.
Reference Values
| Square Kilometers | Square Miles |
|---|---|
| 1 km² | 0.39 mi² |
| 10 km² | 3.86 mi² |
| 100 km² | 38.6 mi² |
| 1,000 km² | 386 mi² |
| 10,000 km² | 3,861 mi² |
| 100,000 km² | 38,610 mi² |
Frequently Asked Questions
What is the conversion factor for km² to mi²?
1 km² = 0.3861 mi². Conversely, 1 mi² = 2.59 km². One square mile is larger than one square kilometer.
Why do most countries use square kilometers?
The kilometer is the metric standard for distance, making km² the natural unit for area. Only the US, the UK (partially), and a few others commonly use square miles.
How big is Germany compared to US states?
Germany (357,000 km² = 138,000 mi²) is slightly smaller than Montana (147,000 mi²) and larger than New Mexico (121,000 mi²).
What's a good comparison for understanding km²?
Central Park (3.4 km²) = 1.3 mi². Manhattan (59 km²) = 23 mi². Rhode Island (4,001 km²) = 1,545 mi². Familiar places give perspective.
Is this conversion used in science?
Scientific papers use metric (km²), but when communicating to American audiences, converting to mi² improves understanding without sacrificing accuracy.
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