Loading Calculator...
Please wait a moment
Please wait a moment
Convert square kilometers to square miles instantly with our free online calculator. Essential for geography, international mapping, travel planning, and comparing country and region sizes.
0.386102
Square Miles per km²
2.58999
km² per Square Mile
1,000,000 m²
Square Meters per km²
Formula: Square Miles = Square Kilometers × 0.386102
| Square Kilometers | Square Miles | Context |
|---|---|---|
| 1 km² | 0.3861 mi² | Small city district or large park |
| 5 km² | 1.931 mi² | Small town or borough |
| 10 km² | 3.861 mi² | Medium town or suburban area |
| 25 km² | 9.653 mi² | Large town or small city |
| 50 km² | 19.31 mi² | Size of Manhattan, New York |
| 100 km² | 38.61 mi² | City like Paris (intra-muros) |
| 250 km² | 96.53 mi² | Mid-size metro area |
| 500 km² | 193.1 mi² | Size of Barcelona metro |
| 1,000 km² | 386.1 mi² | Large city like Berlin or Los Angeles |
| 5,000 km² | 1,931 mi² | Small US county |
| 10,000 km² | 3,861 mi² | Size of Jamaica or Lebanon |
| 100,000 km² | 38,610 mi² | Size of South Korea or Iceland |
| 1,000,000 km² | 386,102 mi² | Size of Egypt or Bolivia |
| 9,833,520 km² | 3,796,742 mi² | Total area of the United States |
| 17,098,242 km² | 6,601,670 mi² | Total area of Russia |
A square kilometer (symbol: km²) is a metric unit of area equal to the area of a square with sides measuring one kilometer (1,000 meters) each. One square kilometer contains exactly 1,000,000 square meters or 100 hectares. It is the standard unit for reporting geographic areas in most countries worldwide, used for everything from city boundaries to national territory measurements. International organizations like the United Nations, World Bank, and CIA World Factbook report country sizes in square kilometers.
A square mile (symbol: mi²) is an imperial unit of area representing a square with sides of exactly one mile (5,280 feet or 1,609.344 meters) in length. One square mile equals 640 acres or approximately 2.59 square kilometers. Square miles are the traditional unit for expressing geographic areas in the United States and the United Kingdom. The US Public Land Survey System, established in 1785, divided western territories into one-square-mile sections, each containing 640 acres.
The relationship between these units is: 1 km² = 0.386102 mi², or conversely, 1 mi² = 2.58999 km². This conversion is essential for international geography, comparing country sizes, interpreting global data, and translating between metric and imperial mapping systems.
The formula to convert square kilometers to square miles is: Square Miles = Square Kilometers × 0.386102. Simply multiply the area in square kilometers by 0.386102 to get the equivalent area in square miles.
Question: San Francisco covers approximately 59 km². What is that in square miles?
Question: Italy has a total area of 301,340 km². Convert to square miles.
This is roughly comparable to the combined area of Arizona and a bit of New Mexico.
Question: Yellowstone National Park covers 8,983 km². How many square miles is that?
For a quick estimate, multiply square kilometers by 0.4 (slightly above the exact factor of 0.386102). This gives a result within about 3.6% accuracy. For example: 1,000 km² × 0.4 = 400 square miles (exact: 386.1). Another approach: divide by 2.6 to get a rough square miles estimate. So 1,000 km² ÷ 2.6 = 385 mi² — very close to the exact answer. Both shortcuts work well for quick mental calculations when traveling or reading international news.
| Country | km² | mi² |
|---|---|---|
| Russia | 17,098,242 | 6,601,670 |
| Canada | 9,984,670 | 3,855,103 |
| United States | 9,833,520 | 3,796,742 |
| Brazil | 8,515,767 | 3,287,956 |
| Australia | 7,692,024 | 2,969,907 |
| India | 3,287,263 | 1,269,219 |
| France | 640,679 | 247,368 |
| Japan | 377,975 | 145,937 |
| United Kingdom | 242,495 | 93,628 |
| Iceland | 103,000 | 39,769 |
| City | km² | mi² |
|---|---|---|
| Tokyo (metro) | 2,194 | 847 |
| London (Greater) | 1,572 | 607 |
| New York City | 783 | 302 |
| Los Angeles | 1,302 | 503 |
| Paris (metro) | 814 | 314 |
| Sydney (metro) | 12,368 | 4,775 |
| Berlin | 892 | 344 |
| Feature | km² | mi² |
|---|---|---|
| Amazon Rainforest | 5,500,000 | 2,123,562 |
| Sahara Desert | 9,200,000 | 3,552,140 |
| Caspian Sea | 371,000 | 143,244 |
| Lake Superior | 82,100 | 31,700 |
| Greenland (ice sheet) | 1,710,000 | 660,235 |
| Antarctica | 14,200,000 | 5,483,249 |
Country sizes, territorial waters, and geographic data are reported in square kilometers by international bodies. Americans and British readers often need square miles equivalents to understand the scale of foreign countries, regions, and natural features in familiar terms.
When planning trips abroad, understanding area in your preferred unit helps estimate travel distances and duration. Knowing that a national park is 500 km² (193 mi²) gives you a much better sense of how long it takes to explore compared to reading an unfamiliar metric figure.
Geographic Information Systems (GIS) professionals regularly convert between square kilometers and square miles when creating maps for international audiences. Satellite imagery, land-use data, and cartographic databases often store areas in metric units that must be converted for imperial-system users.
International news reports natural disasters, wildfires, deforestation, and territorial disputes in square kilometers. Journalists and readers in the US need quick conversions to understand the scale of events — knowing a wildfire burned 1,000 km² translates to about 386 square miles provides immediate context.
Three decimal places (0.386) gives accuracy within 0.03% — sufficient for most geographic comparisons and travel planning.
This inverse relationship is a quick sanity check. Your square miles result should always be smaller than the km² input — roughly 39% of the original number.
When reading about unfamiliar areas, compare to known references: Texas is 696,241 km² (268,596 mi²), and the UK is 242,495 km² (93,628 mi²).
1 kilometer = 0.6214 miles, but 1 km² does NOT equal 0.6214 mi². You must use the squared factor: 0.6214² = 0.386102. Squaring applies to the linear ratio, not the area directly.
Square kilometers measure area (two-dimensional), while kilometers measure distance (one-dimensional). A region 10 km long and 10 km wide is 100 km², not 20 km².
A common mistake is rounding 0.386 to 0.5. In reality, 1 km² is closer to two-fifths (0.4) of a square mile. Using 0.5 would overestimate by nearly 30%.
One square kilometer equals approximately 0.386102 square miles. This means a square kilometer is slightly more than a third of a square mile. To convert any number of square kilometers to square miles, multiply by 0.386102.
A square mile is larger than a square kilometer. One square mile equals approximately 2.58999 square kilometers. So a square mile is about 2.6 times the size of a square kilometer. A square mile contains 640 acres, while a square kilometer contains about 247 acres.
Multiply the number of square kilometers by 0.386102. For example: 10 km² × 0.386102 = 3.861 square miles. For a quick mental estimate, multiply by 0.4 (slightly higher than exact but easy to calculate in your head).
Russia covers approximately 17,098,242 square kilometers, which equals about 6,601,670 square miles. It is the largest country in the world by total area, spanning eleven time zones from Europe to the Pacific coast of Asia.
Square kilometers are part of the International System of Units (SI), the metric system adopted by nearly every country worldwide. Only the United States, Myanmar, and Liberia have not officially adopted the metric system, though the UK uses both systems in everyday life.
The United States covers approximately 9,833,520 square kilometers (3,796,742 square miles), making it the third or fourth largest country by area depending on the measurement methodology used. This includes all 50 states and the District of Columbia.
There is no difference — km² and sq km are both abbreviations for square kilometers. The symbol km² uses the superscript 2, while sq km spells out "square." Both represent exactly the same unit of area: 1,000,000 square meters or 100 hectares.
Yes. One square kilometer equals approximately 247.105 acres. Multiply square kilometers by 247.105 to get acres. Since 1 square mile equals 640 acres, you can also convert km² to square miles first (multiply by 0.386102), then multiply by 640 to get acres.
This calculator uses the internationally recognized conversion factor of 1 km² = 0.386102 mi² (derived from 1 mile = 1.609344 km exactly). For legal land descriptions, surveying, and official documents, always verify conversions with a licensed surveyor or refer to your jurisdiction's official measurement standards.