Reference for one unit; displayed values may be rounded.
Square Kilometers
Use a dot or comma for decimals, without thousands separators.
Square Miles
Display rounding does not improve the accuracy of your original measurement. Very large or very small results use scientific notation.
Method and sourcesq km to sq mi Conversion Formula
To convert square kilometers to square miles, multiply the value by 0.3861. One kilometer is 0.621371 miles, and squaring that ratio yields the 0.3861 area factor.
Square Kilometers and Square Miles Explained
Square Kilometers (km²)
A square kilometer (sq km, km²) is the metric unit for large territories: a square 1,000 meters per side, equal to 100 hectares or 0.3861 square miles. It sizes the world's places in reference works — city centers of tens of sq km, lakes in the hundreds, small nations such as Malta at 316 sq km, and entire regions beyond that.
Where it is used: Square kilometers are the standard for geography, demography, ecology, and administration everywhere except the US, and in all international datasets from the UN downward.
Origin: The kilometer was formalized in France in 1795 as 1,000 meters; its square took over large-area reporting as the metric system spread through the 19th century.
Square Miles (mi²)
A square mile (sq mi, mi²) is the Anglo-American large-area unit: a square one statute mile — 5,280 ft — on each side, equal to 640 acres or 2.59 sq km. US geography runs on it, from Manhattan's 22.8 sq mi of land to the 3,471 sq mi of Yellowstone and the 1,033.8 sq mi of Rhode Island.
Where it is used: Square miles anchor US Census figures, state and county records, national park statistics, and English-language almanacs.
Origin: An English statute of 1593 fixed the mile at 5,280 feet; American surveyors later laid the public lands out in square-mile sections, embedding the unit in US geography.
Square Kilometers to Square Miles Conversion Table
Select a value to use it in the calculator.
| Square Kilometers (km²) | Square Miles (mi²) |
|---|---|
| 0.0965250965 mi² | |
| 0.1930501931 mi² | |
| 0.3861003861 mi² | |
| 0.5791505792 mi² | |
| 0.7722007722 mi² | |
| 0.9652509653 mi² | |
| 1.9305019305 mi² | |
| 2.8957528958 mi² | |
| 3.861003861 mi² | |
| 5.7915057915 mi² | |
| 7.722007722 mi² | |
| 9.6525096525 mi² | |
| 19.305019305 mi² | |
| 28.9575289575 mi² | |
| 38.61003861 mi² | |
| 57.9150579151 mi² | |
| 77.2200772201 mi² | |
| 96.5250965251 mi² | |
| 193.0501930502 mi² | |
| 386.1003861004 mi² |
Square Miles to Square Kilometers Conversion Table
| Square Miles (mi²) | Square Kilometers (km²) |
|---|---|
| 1 mi² | 2.59 km² |
| 2 mi² | 5.18 km² |
| 5 mi² | 12.95 km² |
| 10 mi² | 25.9 km² |
| 20 mi² | 51.8 km² |
| 25 mi² | 64.75 km² |
| 50 mi² | 129.5 km² |
| 100 mi² | 259 km² |
| 200 mi² | 518 km² |
| 250 mi² | 647.5 km² |
| 500 mi² | 1295 km² |
Square Kilometers to Square Miles in Everyday Objects
Common real-world examples that make Square Kilometers and Square Miles easy to picture at a glance.
| Square Kilometers (km²) | Square Miles (mi²) | |
|---|---|---|
| Paris city proper | 105.4 km² | 40.694980695 mi² |
| Lake Balaton in Hungary | 592 km² | 228.5714285714 mi² |
| Gibraltar | 6.8 km² | 2.6254826255 mi² |
| Central Park | 3.41 km² | 1.3166023166 mi² |
| Liechtenstein | 160 km² | 61.7760617761 mi² |
| Malta | 316 km² | 122.0077220077 mi² |
| Hyde Park in London | 1.42 km² | 0.5482625483 mi² |
When You Need Square Kilometers to Square Miles Conversions
Reading European City Profiles
Barcelona's 101.4 sq km converts to 39.15 sq mi, letting an American weigh it against San Francisco's roughly 47 sq mi of land before a move.
Lake and Reservoir Comparisons
Lake Balaton at 592 sq km is 228.53 sq mi, while Lake Tahoe's 496 sq km is 191.51 sq mi — a fair fight once both figures wear the same unit.
Country Size for US Readers
Liechtenstein's 160 sq km becomes 61.78 sq mi, instantly graspable as a country smaller than Washington, DC (61.4 sq mi of land).
Administrative District Planning
A 25 sq km zoning district is 9.65 sq mi on the joint US-EU planning map, where density targets of 8,000 per sq km read as about 20,720 per sq mi.
Related Area Conversions
How to Use
-
1
Enter the Area in sq km
Type the square-kilometer figure from the metric source — for example, 105.4 sq km for the city of Paris
-
2
See the Square Miles
The result appears instantly: 105.4 sq km = 40.69 sq mi, the figure American readers expect
-
3
Copy or Reverse
Copy the result into your article, or click Swap to translate a US statistic back into sq km
-
4
Check the Table
Scan the table for anchors like 50 sq km = 19.31 sq mi and 250 sq km = 96.53 sq mi while comparing places
Why Use Be Converter?
Instant Conversion
Get square kilometers in square miles in real time as you type — ideal while skimming atlases and travel guides
Precision Guaranteed
Applies the exact 0.3861 factor implied by the 0.621371 mi per km ratio in this tool's data — consistent with its sq mi counterpart
Handy Reference Table
Territory figures at a glance — 10 sq km = 3.861 sq mi, 100 sq km = 38.61 sq mi, 1,000 sq km = 386.1 sq mi — for instant context
Swap with One Click
Flip back to sq mi to sq km instantly when an American figure needs to appear in a metric report
Free & Unlimited
No registration, no caps. Convert every country, lake, district, and park figure you research — always free
Completely Private
All calculations run locally in your browser. Your geography research never leaves your device
Frequently Asked Questions
How many square miles are in 1 square kilometer?
How do I convert 10 sq km to sq mi?
What is 100 sq km in square miles?
Is a square kilometer smaller than a square mile?
Why do European city stats use square kilometers?
How many sq mi is Paris?
How many square miles is 50 sq km?
How many sq km are in 1 square mile?
About Square Kilometers to Square Miles Converter
Our free online square kilometers to square miles converter brings world geography home for American readers. European capitals, Caribbean islands, Alpine lakes, and Southeast Asian districts are all measured in square kilometers, while US audiences think in square miles. Whether you are writing travel content, studying for an exam, or comparing administrative districts, this tool applies the exact factor of 0.3861 sq mi per sq km on every keystroke.
Expert Tips for sq km to sq mi Conversion
The factor is the square of the length ratio: 1 km = 0.621371 mi, and 0.621371² = 0.3861 — lengths and areas never share the same conversion number.
Keep anchors handy: Paris 105.4 sq km = 40.69 sq mi, Malta 316 sq km = 122.01 sq mi, and Liechtenstein 160 sq km = 61.78 sq mi.
For lakes, convert before comparing: Lake Balaton (592 sq km) is 228.53 sq mi — nearly Lake Tahoe's 496 sq km (191.51 sq mi) plus a fifth again.
Mental shortcut: divide sq km by 2.6 — a 200 sq km metro area gives roughly 77 sq mi against the exact 77.22, plenty close for conversation.
Density conversions need the same factor: 8,000 people per sq km is 8,000 ÷ 0.3861 ≈ 20,720 per sq mi, the form US planning debates use.
Professional-grade conversion tools for length, weight, area, volume, temperature, pressure, speed, time, and energy measurements