Square Kilometers and Square Feet Converter

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This converter allows for the conversion between the largest unit of area within the metric system, the square kilometer, and a very common unit of area within the imperial system, the square foot.

Start by choosing between the American and British spelling of the word kilometer, which is spelled ‘kilometre’ in the British style of spelling.

Choose your input unit in the ‘CONVERT FROM and your output unit in the ‘CONVERT TO sections. If you want to swap the order of the preselected units, you can simply click on the icon with the two arrows headed in opposite directions. The possible choices are identical for both sections between the square kilometers (km2) and the square feet (ft2).

Type the input value into the ‘VALUE TO CONVERTsection, choose the number of decimal places you want your result rounded toward, and click on ‘CONVERT.

Your result will appear below the converter as a decimal number rounded to the desired number of decimal places.

Additionally, a conversion rate between the input and output unit will appear alongside a convenient ‘COPY icon next to the result, which will allow you to easily copy the result and paste it elsewhere if needed.

Converting Square Kilometers and Square Feet Manually

In order to convert between the two units manually, we must determine the conversion rate between a kilometer and a foot.

The reason why we start with the conversion rates of the units of length is, that both of the square units of area are determined by them, as a square kilometer is identical in size to a square with a side length of 1 km, while a square foot is identical in size to a square with a side length of 1 foot.

Hence, we start by defining the following two relationships:

RatioDecimal
Feet:Kilometers1:0.0003
Kilometers:Feet1:3,280

To change these relationships of length into relationships of area, we put all the values within each conversion rate to the power of two. This is what happens.

Area RatioDecimal2Decimal
ft2 to km212:0.00032 1:0.00000009
km2 to ft212:3,28921:10,817,521

The values we received are rounded for convenience. For more accurate results, use our converter.

Now that we have the conversion rates, two formulae can be created for converting between the units.

km^2 = ft^2 * 0.00000009
ft^2 = km^2 * 10,817,521

The usage of these two formulae is demonstrated in the examples below.

EXAMPLE 1: A castle is built on land with an area of 123,500 ft2. How many km2 does the area of this castle cover?

Our input unit is ft2, while our output is km2. This makes the first formula more suitable for solving this problem, as we simply substitute 123,500 instead of ft2 and perform a multiplication.

km^2 = ft^2 * 0.00000009 \\= 123,500 * 0.00000009 \\= 0.011115 ~km^2.

EXAMPLE 2: A golf course covers an area of 1.2 km2. How many ft2 does this golf course cover?

For this problem, the second equation is more suitable due to the fact that now km2 is our input, while ft2 is the output. We substitute 1.2 for km2 and solve as follows.

ft^2 = km^2 * 10,817,521 \\= 1.2 * 10,817,521 \\= 12,981,025.2 ~ft^2.

The World’s Largest Countries

When measuring areas of countries, km2 are the most preferred metric unit to do so. The list below shows us the areas of the 5 biggest countries in the world.

COUNTRYAREA IN KM2
Russia17,098,242 km²
Canada9,984,670 km²
United States9,833,520 km²
China9,706,961 km²
Brazil8,515,767 km²

Resources

https://theworldtravelguy.com/largest-countries-in-the-world/