How to convert square feet to square kilometers
To convert square feet to square kilometers, multiply by 9.290304e-8. Area conversions are essential for real estate, flooring, land surveys, farming and map reading.
Square Foot to Square Kilometer conversion table
| Square Foot (ft²) | Square Kilometer (km²) |
|---|---|
| 0.1 ft² | 9.290304e-9 km² |
| 0.5 ft² | 4.645152e-8 km² |
| 1 ft² | 9.290304e-8 km² |
| 2 ft² | 1.8580608e-7 km² |
| 3 ft² | 2.7870912e-7 km² |
| 4 ft² | 3.7161216e-7 km² |
| 5 ft² | 4.645152e-7 km² |
| 10 ft² | 9.290304e-7 km² |
| 20 ft² | 0.0000018580608 km² |
| 25 ft² | 0.000002322576 km² |
| 50 ft² | 0.000004645152 km² |
| 100 ft² | 0.000009290304 km² |
| 500 ft² | 0.00004645152 km² |
| 1,000 ft² | 0.00009290304 km² |
About the units
Square Foot (ft²)
A square foot equals exactly 0.09290304 m² and is the standard unit for US home sizes.
Square Kilometer (km²)
A square kilometer equals 1,000,000 m² and measures cities, lakes and countries.
How to use this converter
- Type the number of square feet (ft²) in the input box.
- The result in square kilometers appears instantly — no button needed.
- See the same value in every other area unit just below.
- Use “Swap units” to convert square kilometers back to square feet.
When you’ll use the square foot to square kilometer conversion
Converting square feet to square kilometers comes up more often than you might expect — for example when checking room sizes on a floor plan, comparing apartment or house sizes, or ordering flooring, turf or paint. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
💡 For a quick estimate in your head, multiply by about 9.3e-8 (the exact factor is 9.290304e-8).
Watch out for these mix-ups
- Converting area with a length factor — square units need the factor squared.
- Confusing acres (US/UK) with hectares (metric); one hectare is about 2.47 acres.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many square kilometers are in one square foot?
One square foot equals 9.290304e-8 square kilometers. 9.290304e-8 is the exact factor used by this converter.
How do I convert square feet to square kilometers?
Multiply the value in square feet by 9.290304e-8. To go the other way, multiply square kilometers by 10,763,910.4167.
What is 10 ft² in km²?
10 ft² = 9.290304e-7 km². Also, 5 ft² = 4.645152e-7 km² and 100 ft² = 0.000009290304 km².
What is the difference between a square foot and a square kilometer?
A square foot equals exactly 0.09290304 m² and is the standard unit for US home sizes. A square kilometer equals 1,000,000 m² and measures cities, lakes and countries.
Is this tool free and private?
Yes — the Square Foot to Square Kilometer is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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