You do not.
A kilometre is a measure of distance while a square kilometre is a measure of area. The two measure different things and it makes no sense to try to convert from one to the other.
You can convert miles to km, or square miles to square kilometers. You can't convert square units to linear units.
You multiply square km by 10,763,910.4 to get square feet.
Multiply square km by 0.39 to get approximate square miles.
Square feet x 0.0000000929 = square kilometers
Answer: 356840 km² = 137,776.694 mi²
1 mile = 1.609344 km (exactly) → 1 sq mile = 1 mile × 1 mile = 1.609344 km × 1.609344 km ≈ 2.58999 sq km → To approximately convert square miles to square km multiply by 2.59.
Answer: 11.7 mi² = 30.3028 km²
443070 square kilometers is equal to 171,070.3 square miles.
To convert hectares to square kilometers, you can use the conversion factor: 1 hectare is equal to 0.01 square kilometers. So, to convert, simply multiply the number of hectares by 0.01 to get the equivalent area in square kilometers.
To convert from square centimeters (cm²) to square kilometers (km²), you need to understand the relationship between the units. There are 10,000 square centimeters in a square meter and 1,000,000 square meters in a square kilometer. Therefore, to convert 1 cm² to km², divide by 10,000 to get it in m² and then by 1,000,000 to convert to km², resulting in (1 , \text{cm}² = 1 \times 10^{-10} , \text{km}²).
Multiply the number of square km by 247.105 to get acres. Example, 10 square km x 247.105 = 2,471.053 acres.
Multiply the number of square km by 10,763,910.416. In your example, 45 x 10,763,910.416 = 484,375,968.75 square feet.