Convert square feet to square kilometres
1 ft² = 9.2903e-8 km²
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All unit convertersQuestions
How many square kilometres are in a square foot?
One square foot is 9.290304e-8 square kilometres. To convert any amount, multiply by 9.290304e-8. Going the other way, one square kilometre is 10763910.4 square feet.
What is the formula to convert ft² to km²?
Multiply the square foot figure by 9.290304e-8. So km² = ft² × 9.290304e-8. For a quick mental estimate, dividing by about 10763910.42 gets you close enough for most everyday purposes.
What does a square foot actually look like?
One square foot is about the size of a floor tile. The square foot is exactly 0.09290304 square metres. It remains the property unit in the US, Canada, the UK and much of South Asia.
And what is a square kilometre?
One square kilometre is a medium city park. The square kilometre is the standard unit for reporting the area of cities, parks and countries in the metric world.
Is this conversion exact?
Yes. Since the 1959 international yard and pound agreement, the imperial and metric systems are related by exact definitions rather than measurements — the inch is exactly 25.4 mm and the pound exactly 0.45359237 kg. Everything derived from those, including this conversion, is therefore exact. Round at the end rather than partway through, since rounding ft² before converting introduces an error the conversion then multiplies.
About ft² to km²
How to convert square feet to square kilometres
Multiply by 9.290304e-8. One square foot is 9.290304e-8 square kilometres, and one square kilometre is 10763910.4 square feet.
km² = ft² × 9.290304e-8
Worked example
100 ft² = 0.000009290304 km². For a sense of scale, one square foot is about the size of a floor tile, and one square kilometre is a medium city park.
About the square foot
The square foot is exactly 0.09290304 square metres. It remains the property unit in the US, Canada, the UK and much of South Asia.
About the square kilometre
The square kilometre is the standard unit for reporting the area of cities, parks and countries in the metric world.
Quick reference
| square feet | square kilometres |
|---|---|
| 1 ft² | 9.2903e-8 km² |
| 2 ft² | 1.85806e-7 km² |
| 5 ft² | 4.64515e-7 km² |
| 10 ft² | 9.2903e-7 km² |
| 25 ft² | 0.00000232258 km² |
| 50 ft² | 0.00000464515 km² |
| 100 ft² | 0.0000092903 km² |
| 1000 ft² | 0.000092903 km² |
Getting it right
This conversion is exact by definition, so the only limit on accuracy is how many digits you keep. Round at the end rather than partway through — rounding ft² to a whole number before converting introduces an error that the conversion then multiplies.
Other area conversions
Convert square kilometres back to square feet, or pick any other pair with the full unit converter. Related: ft² to m², ft² to acre, ft² to ha.