Convert Square Kilometers to Square Miles
Instantly convert Square Kilometers (km²) to Square Miles (mi²) with our free online calculator.
Formula: km² to mi² — multiply by 0.386102
Reference Table
| Square Kilometers (km²) | Square Miles (mi²) |
|---|---|
| 1 | 0.386102 |
| 5 | 1.93051 |
| 10 | 3.86102 |
| 25 | 9.65255 |
| 50 | 19.3051 |
| 100 | 38.6102 |
How to Convert Square Kilometers to Square Miles
Formula
To convert Square Kilometers (km²) to Square Miles (mi²): multiply by 0.386102
Step-by-Step
- Start with your value in Square Kilometers (km²).
- Multiply by 0.386102 to perform the conversion.
- The result is your value expressed in Square Miles (mi²).
Conversion Factor
1 km² = 0.386102 mi²
Reverse Factor
1 mi² = 2.58999 km²
Worked Example
Convert 25 Square Kilometers to Square Miles: 25 km² = 9.65255 mi²
About Square Kilometer (km²)
A metric unit of area equal to exactly 1,000,000 m² (a square with 1-kilometer sides). Square kilometers are the default unit for geographic scale: country sizes per CIA World Factbook + UN Statistics Division (Russia 17,098,242 km² largest; Vatican City 0.49 km² smallest; USA 9,833,517 km²; China 9,596,961 km²; Brazil 8,515,767 km²; Australia 7,692,024 km²; Canada 9,984,670 km²; France 643,801 km²; UK 243,610 km²; Germany 357,022 km²; Japan 377,975 km²); city/metro footprints (Manhattan 59 km²; NYC 783.8 km²; London Greater 1,572 km²; Tokyo 23 special wards 627 km²; Mexico City 1,485 km²); forest and agricultural land per FAO FRA reporting; deforestation tracking per MapBiomas, Global Forest Watch (Amazon biome ~5.5 million km²); urban heat-island and wildfire burn-area reporting in news (2018 Camp Fire 620 km²; 2020 Australian bushfires 186,000 km²); lake and watershed areas (Lake Superior 82,100 km²; Mississippi River basin 3,202,200 km²); satellite-imagery scene footprints (Landsat 8 scene ~32,000 km²). km² is the preferred unit in most international geographic statistics, climate models, and macro-scale GIS analysis.
About Square Mile (mi²)
An imperial unit of area equal to approximately 2.589988 km² (= 640 acres = 27,878,400 ft² exactly per NIST SP 811). Square miles are the customary US unit for: US county sizes per US Census Bureau (San Bernardino County, CA at 20,105 mi² is largest US county outside Alaska; Yukon-Koyukuk Census Area, AK is 145,505 mi²); US national parks (Wrangell-St. Elias National Park 13,005 mi² largest; Yellowstone 3,468 mi²; Yosemite 1,189 mi²; Grand Canyon 1,902 mi²; Death Valley 5,270 mi²); US metro-area footprints (Greater New York metro area ~13,318 mi²; Greater Los Angeles 4,850 mi²); US state sizes (Alaska 665,384 mi² largest; Rhode Island 1,545 mi² smallest); wildfire burn areas in US news reporting (2018 Camp Fire 240 mi²; 2020 California August Complex Fire 1,032 mi²; 2024 Park Fire 670 mi²); US watershed reporting per USGS HUC-12 boundary-area data. Geographic conversions between mi² and km² (multiply by 2.589988) are routine for US news consumers reading international reports and US federal-agency reports issued in dual units.
Quick Facts
- 1 Square Kilometer equals 0.386102 Square Miles
- 1 Square Mile equals 2.58999 Square Kilometers
- Square Kilometer is a unit of area
- Square Mile is a unit of area
- This conversion is commonly used in real estate, agriculture, landscaping, and urban planning
- The Square Kilometer belongs to the metric system
- The Square Mile belongs to the imperial system
Common Square Kilometer to Square Mile Conversions
| Square Kilometers (km²) | Square Miles (mi²) |
|---|---|
| 0.01 | 0.00386102 |
| 0.1 | 0.0386102 |
| 0.25 | 0.0965255 |
| 0.5 | 0.193051 |
| 1 | 0.386102 |
| 2 | 0.772204 |
| 3 | 1.15831 |
| 5 | 1.93051 |
| 10 | 3.86102 |
| 15 | 5.79153 |
| 20 | 7.72204 |
| 25 | 9.65255 |
| 50 | 19.3051 |
| 75 | 28.9577 |
| 100 | 38.6102 |
| 250 | 96.5255 |
| 500 | 193.051 |
| 1000 | 386.102 |
| 5000 | 1930.51 |
| 10000 | 3861.02 |
Understanding Square Kilometers
The Square Kilometer (symbol: km²) is a unit of area. A metric unit of area equal to exactly 1,000,000 m² (a square with 1-kilometer sides). Square kilometers are the default unit for geographic scale: country sizes per CIA World Factbook + UN Statistics Division (Russia 17,098,242 km² largest; Vatican City 0.49 km² smallest; USA 9,833,517 km²; China 9,596,961 km²; Brazil 8,515,767 km²; Australia 7,692,024 km²; Canada 9,984,670 km²; France 643,801 km²; UK 243,610 km²; Germany 357,022 km²; Japan 377,975 km²); city/metro footprints (Manhattan 59 km²; NYC 783.8 km²; London Greater 1,572 km²; Tokyo 23 special wards 627 km²; Mexico City 1,485 km²); forest and agricultural land per FAO FRA reporting; deforestation tracking per MapBiomas, Global Forest Watch (Amazon biome ~5.5 million km²); urban heat-island and wildfire burn-area reporting in news (2018 Camp Fire 620 km²; 2020 Australian bushfires 186,000 km²); lake and watershed areas (Lake Superior 82,100 km²; Mississippi River basin 3,202,200 km²); satellite-imagery scene footprints (Landsat 8 scene ~32,000 km²). km² is the preferred unit in most international geographic statistics, climate models, and macro-scale GIS analysis.
It belongs to the metric measurement system.
Square Kilometers are commonly used in real estate, agriculture, landscaping, and urban planning.
Understanding Square Miles
The Square Mile (symbol: mi²) is a unit of area. An imperial unit of area equal to approximately 2.589988 km² (= 640 acres = 27,878,400 ft² exactly per NIST SP 811). Square miles are the customary US unit for: US county sizes per US Census Bureau (San Bernardino County, CA at 20,105 mi² is largest US county outside Alaska; Yukon-Koyukuk Census Area, AK is 145,505 mi²); US national parks (Wrangell-St. Elias National Park 13,005 mi² largest; Yellowstone 3,468 mi²; Yosemite 1,189 mi²; Grand Canyon 1,902 mi²; Death Valley 5,270 mi²); US metro-area footprints (Greater New York metro area ~13,318 mi²; Greater Los Angeles 4,850 mi²); US state sizes (Alaska 665,384 mi² largest; Rhode Island 1,545 mi² smallest); wildfire burn areas in US news reporting (2018 Camp Fire 240 mi²; 2020 California August Complex Fire 1,032 mi²; 2024 Park Fire 670 mi²); US watershed reporting per USGS HUC-12 boundary-area data. Geographic conversions between mi² and km² (multiply by 2.589988) are routine for US news consumers reading international reports and US federal-agency reports issued in dual units.
It belongs to the imperial measurement system.
Square Miles are commonly used in real estate, agriculture, landscaping, and urban planning.
Why Convert Square Kilometers to Square Miles?
Converting between Square Kilometers and Square Miles is a frequent requirement for engineers, scientists, and students working with area values. Different industries and regions favour different unit systems, so having a dependable conversion tool saves time and prevents errors in technical calculations. Whether you are verifying a specification sheet, cross-checking simulation results, or preparing a report for an international audience, accurate area conversion is essential.
Frequently Asked Questions
How do I convert Square Kilometers to Square Miles?
A metric unit of area equal to exactly 1,000,000 m² (a square with 1-kilometer sides). To convert Square Kilometers to Square Miles, multiply by 0.386102. For example, 25 km² equals 9.65255 mi².
How many Square Miles are in 1 Square Kilometer?
There are 0.386102 Square Miles in 1 Square Kilometer.
How many Square Kilometers are in 1 Square Mile?
There are 2.58999 Square Kilometers in 1 Square Mile.
What is the formula for Square Kilometer to Square Mile conversion?
The formula is: multiply by 0.386102. This means 1 km² = 0.386102 mi².
Is a Square Kilometer bigger than a Square Mile?
Yes. One Square Kilometer is larger than one Square Mile because 1 km² equals 0.386102 mi², which is less than 1.
When do you need to convert between Square Kilometers and Square Miles?
An imperial unit of area equal to approximately 2. Square Kilometer and Square Mile are both area units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.