Square Feet to Square Kilometers converter (ft² to km²)
Convert Square Feet (ft²) to Square Kilometers (km²) with this free calculator. Type a value, press Convert, and the page applies the same factor shown in the formula below — no rounded shortcut, and nothing is stored on a server.
Square Kilometers to Square Feet (km² to ft²) ►
How to convert Square Feet to Square Kilometers
1 square foot (ft²) is equal to 9.290304×10⁻⁸ square kilometers (km²).
km² = ft² × 9.290304×10⁻⁸
Multiply the area in square feet by 9.290304×10⁻⁸:
Example: Convert 1,000,000 ft² to km²:
km² = 1,000,000 × 9.29×10⁻⁸ = 0.0929 km²
What is a Square Feet?
The Square Feet (ft²) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
What is a Square Kilometers?
The Square Kilometers (km²) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
This page converts area from Square Feet into Square Kilometers. One ft² equals 9.290304e-8 km².
Square Feet to Square Kilometers conversion table
Common ft² values and the matching km² result, calculated with the same factor as the widget. Highlight a nearby row if you want a quick check without entering a number.
| Square Feet (ft²) | Square Kilometers (km²) |
|---|---|
| 100000 ft² | 0.009290304 km² |
| 500000 ft² | 0.04645152 km² |
| 1000000 ft² | 0.09290304 km² |
| 5000000 ft² | 0.4645152 km² |
| 10000000 ft² | 0.9290304 km² |
How this calculator works
The form on this page is a Square Feet-to-Square Kilometers converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the km² result in the output box. The step-by-step panel repeats the arithmetic so you can copy it into homework or a spreadsheet.
Reviewed by Hamsen, founder of GigaTables and a biology engineer. See the about page for how formulas are checked before a tool is published.
FAQ
How many km² are in 1 ft²?
1 ft² = 9.290304e-8 km².
How do I convert Square Feet to Square Kilometers?
Multiply the area in square feet by 9.290304×10⁻⁸:
Is this ft² to km² converter free?
Yes. GigaTables calculators are free to use in a browser. You do not need an account, and the values you type are not uploaded.