Square feet to Square kilometres
Convert square feet to square kilometres (ft² to km²). 1 ft² = 9.290304E-8 km². Use the calculator, formula and conversion table.
How to convert square feet to square kilometres
Multiply the amount in square feet by 9.290304E-8 to get square kilometres. The displayed factor and results are rounded to 12 significant digits.
km² = ft² × 9.290304E-8Worked example
1 ft² = 9.290304E-8 km². Change the amount in the calculator above to use your own value.
Units and assumptions
Area uses squared length factors: one square foot is exactly 0.09290304 square metres. Acres are international acres; hectares equal 10,000 square metres.
Calculator results use floating-point arithmetic and are rounded for display. The reference table below uses up to 12 significant digits.
Square feet to Square kilometres table
| Square feet (ft²) | Square kilometres (km²) |
|---|---|
| 0 | 0 |
| 1 | 9.290304E-8 |
| 5 | 4.645152E-7 |
| 10 | 9.290304E-7 |
| 25 | 0.000002322576 |
| 100 | 0.000009290304 |
| 1,000 | 0.00009290304 |
About this conversion
What is the formula for square feet to square kilometres?
km² = ft² × 9.290304E-8. Multiply the amount in square feet by 9.290304E-8 to get square kilometres. The displayed factor and results are rounded to 12 significant digits.
How do I convert back to square feet?
Use the square kilometres to square feet calculator to reverse this conversion. You can also use Swap units in the calculator above.
Can I use a different pair of units?
Choose another unit in the calculator, or open the area converter to browse all supported pairs.