📐 Area
Sq Miles to Sq Km Converter
Convert sq miles to sq km instantly. Enter any value and get the result. Includes a conversion table and the exact formula.
Quick answer: To convert sq miles to sq km, multiply by 2.58999. For example, 1 sq miles = 2.58999 sq km. Use the calculator below for any value.
sq miles to sq km
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Common conversions
| Sq Miles | Sq Km |
|---|
Formula:
How to convert sq miles to sq km
1
Enter your value
Type the number of sq miles you want to convert into the left box. The result in sq km appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — Sq Km to Sq Miles. Your current value carries across so you don't have to re-enter anything.
3
About Sq Miles and Sq Km
sq miles and sq km are both units of area. Use this converter to switch between them instantly.
💡 Did you know?
1 sq mile = 2.59 km². Greater London = 1,572 km² ≈ 607 sq miles. Manhattan = 87.5 km² ≈ 34 sq miles. The continental US = 9.8 million km² = 3.8 million sq miles.
📊 Common conversions at a glance
| Sq Miles | Sq Km |
|---|---|
| 1 | 2.59 |
| 2 | 5.18 |
| 5 | 12.95 |
| 10 | 25.9 |
| 50 | 129.5 |
| 100 | 259 |
Reviewed for 2026. Sq Miles ↔ Sq Km conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.