Square kilometers to Square miles Converter
1 square kilometer (km²) equals 0.386102158542 square miles (mi²).
Quick answer
To convert km² to square miles, multiply by 0.386102. 100 km² ≈ 38.6 sq mi.
- 1 square kilometer = 0.3861021585 square miles
- 1 square mile = 2.58998811 square kilometers
- Formula: mi² = km² × 0.386102158542
- Quick estimate: multiply by 0.4 and take off 3.5%: 1,000 km² ≈ 386 sq mi.
1 square kilometer = 0.3861021585 square miles
How to convert square kilometers to square miles
mi² = km² × 0.386102158542
To convert square kilometers to square miles, multiply the number of square kilometers by 0.386102158542.
Example: 42 km² to mi²
- Start with the value in square kilometers: 42 km².
- Multiply by 0.386102158542: 42 × 0.386102158542 = 16.21629066.
- Result: 42 square kilometers = 16.21629066 square miles.
Going the other way, 1 square mile = 2.58998811034 square kilometers, so to convert square miles back to square kilometers you divide by the same number. See square miles to square kilometers.
Where the conversion factor comes from
A square mile is 5,280 × 5,280 = 27,878,400 square feet, which is exactly 2.589988110336 km² (640 acres). One square kilometer is 0.3861 square miles or 100 hectares.
Mental math: km² to mi² in your head
Multiply by 0.4 and subtract about 3.5%.
When you need to convert square kilometers to square miles
- Country, city and park sizes.
- Wildfire and deforestation reports.
Common mistakes
- Using the linear factor 0.621: area needs 0.621² = 0.386.
Everyday square kilometers in square miles
| Example | Square kilometers | Square miles |
|---|---|---|
| Manhattan | 59.1 km² | 22.819 mi² |
| London (Greater) | 1,572 km² | 606.95 mi² |
| Belgium | 30,689 km² | 11,849 mi² |
| France (metropolitan) | 551,695 km² | 213,010 mi² |
Square kilometers to square miles conversion table
| Square kilometers (km²) | Square miles (mi²) |
|---|---|
| 0.1 km² | 0.03861021585 mi² |
| 0.2 km² | 0.07722043171 mi² |
| 0.3 km² | 0.1158306476 mi² |
| 0.4 km² | 0.1544408634 mi² |
| 0.5 km² | 0.1930510793 mi² |
| 0.6 km² | 0.2316612951 mi² |
| 0.7 km² | 0.270271511 mi² |
| 0.8 km² | 0.3088817268 mi² |
| 0.9 km² | 0.3474919427 mi² |
| 1 km² | 0.3861021585 mi² |
| 1.5 km² | 0.5791532378 mi² |
| 2 km² | 0.7722043171 mi² |
| 2.5 km² | 0.9652553964 mi² |
| 3 km² | 1.158306476 mi² |
| 3.5 km² | 1.351357555 mi² |
| 4 km² | 1.544408634 mi² |
| 4.5 km² | 1.737459713 mi² |
| 5 km² | 1.930510793 mi² |
| 6 km² | 2.316612951 mi² |
| 7 km² | 2.70271511 mi² |
| 7.5 km² | 2.895766189 mi² |
| 8 km² | 3.088817268 mi² |
| 9 km² | 3.474919427 mi² |
| 10 km² | 3.861021585 mi² |
| 11 km² | 4.247123744 mi² |
| 12 km² | 4.633225903 mi² |
| 13 km² | 5.019328061 mi² |
| 14 km² | 5.40543022 mi² |
| 15 km² | 5.791532378 mi² |
| 16 km² | 6.177634537 mi² |
| 17 km² | 6.563736695 mi² |
| 18 km² | 6.949838854 mi² |
| 19 km² | 7.335941012 mi² |
| 20 km² | 7.722043171 mi² |
| 21 km² | 8.108145329 mi² |
| 22 km² | 8.494247488 mi² |
| 23 km² | 8.880349646 mi² |
| 24 km² | 9.266451805 mi² |
| 25 km² | 9.652553964 mi² |
| 26 km² | 10.03865612 mi² |
More km² to mi² values
- 27 km²
- 28 km²
- 29 km²
- 30 km²
- 31 km²
- 32 km²
- 33 km²
- 34 km²
- 35 km²
- 36 km²
- 37 km²
- 38 km²
- 39 km²
- 40 km²
- 41 km²
- 42 km²
- 43 km²
- 44 km²
- 45 km²
- 46 km²
- 47 km²
- 48 km²
- 49 km²
- 50 km²
- 51 km²
- 52 km²
- 53 km²
- 54 km²
- 55 km²
- 56 km²
- 57 km²
- 58 km²
- 59 km²
- 60 km²
- 61 km²
- 62 km²
- 63 km²
- 64 km²
- 65 km²
- 66 km²
- 67 km²
- 68 km²
- 69 km²
- 70 km²
- 71 km²
- 72 km²
- 73 km²
- 74 km²
- 75 km²
- 76 km²
- 77 km²
- 78 km²
- 79 km²
- 80 km²
- 81 km²
- 82 km²
- 83 km²
- 84 km²
- 85 km²
- 86 km²
- 87 km²
- 88 km²
- 89 km²
- 90 km²
- 91 km²
- 92 km²
- 93 km²
- 94 km²
- 95 km²
- 96 km²
- 97 km²
- 98 km²
- 99 km²
- 100 km²
- 110 km²
- 120 km²
- 130 km²
- 140 km²
- 150 km²
- 160 km²
- 170 km²
- 180 km²
- 190 km²
- 200 km²
- 210 km²
- 220 km²
- 230 km²
- 240 km²
- 250 km²
- 260 km²
- 270 km²
- 280 km²
- 290 km²
- 300 km²
- 310 km²
- 320 km²
- 330 km²
- 340 km²
- 350 km²
- 360 km²
- 370 km²
- 380 km²
- 390 km²
- 400 km²
- 410 km²
- 420 km²
- 430 km²
- 440 km²
- 450 km²
- 460 km²
- 470 km²
- 480 km²
- 490 km²
- 500 km²
- 600 km²
- 700 km²
- 800 km²
- 900 km²
- 1,000 km²
- 1,200 km²
- 1,500 km²
- 2,000 km²
- 2,500 km²
- 3,000 km²
- 4,000 km²
- 5,000 km²
- 10,000 km²
What is a square kilometer?
The square kilometer is the area of a square one kilometer on each side, one million square meters or 100 hectares, about 0.386 square miles.
What is a square mile?
The square mile is the area of a square one mile on each side, 640 acres or about 2.59 square kilometers.
Convert square kilometers to other units
- Square kilometers to square meters
- Square kilometers to square feet
- Square kilometers to acres
- Square kilometers to hectares
- Square kilometers to square centimeters
- Square kilometers to square yards
- Square kilometers to square inches
- Square kilometers to square millimeters
- Square kilometers to pyeong
- Square kilometers to bighas
- All square kilometer conversions →
Convert other units to square miles
- Square meters to square miles
- Square feet to square miles
- Acres to square miles
- Hectares to square miles
- Square centimeters to square miles
- Square yards to square miles
- Square inches to square miles
- Square millimeters to square miles
- Pyeong to square miles
- Bighas to square miles
- All square mile conversions →
Frequently asked questions
How many square miles are in a square kilometer?
One square kilometer is 0.3861021585 square miles.
How many square kilometers are in a square mile?
One square mile is 2.58998811 square kilometers.
What is the formula to convert square kilometers to square miles?
mi² = km² × 0.386102158542.
How many square miles is 1 km²?
0.386 square miles.