About the ft² to km² calculation
One square foot is exactly 9.2903e-8 square kilometers, so converting between them is a single multiplication. Enter any value above and the result updates as you type. How property floor area is quoted in the US, UK and India. The usual scale for reporting the area of cities and regions.
Formula
km² = ft² × 9.2903e-8
1 ft² = 9.2903e-8 km²
1 km² = 10,763,910.42 ft²Worked example
To convert 1,000 ft², multiply by 9.2903e-8: 1,000 × 9.2903e-8 = 0.0000929 km².
Frequently asked questions
How many square kilometers are in a square foot?
There are 9.2903e-8 square kilometers in one square foot. To convert any amount, multiply the number of square feet by 9.2903e-8.
How do I convert square kilometers back to square feet?
Divide instead of multiplying, or equivalently multiply by 10,763,910.42. One square kilometer is 10,763,910.42 square feet.
Is this conversion exact?
Yes. Since the international agreement of 1959, the relationship between square feet and square kilometers is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.
Where is each of these units used?
Square Feet: how property floor area is quoted in the US, UK and India. Square Kilometers: the usual scale for reporting the area of cities and regions.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units