Square Feet to Square Kilometers Converter
1 square foot = 9.290304e-8 square kilometers
1 square foot equals 9.2903e-8 square kilometers
How to convert square feet to square kilometers
Area factors are squared length factors: 1 ft² = (0.3048 m)². The acre here uses international feet; historic US survey acres differ slightly.
km² = ft² × 9.290304e-8One square foot is 9.290304e-8 square kilometers, so a single multiplication converts any value.
0.00000092903 km² ≈ 10 × 9.290304e-8Square feet to square kilometers conversion table
Common values in square feet, converted to square kilometers.
| Square feet (ft²) | Square kilometers (km²) |
|---|---|
| 1 | 9.290304e-8 |
| 2 | 0.00000018580608 |
| 3 | 0.00000027870912 |
| 4 | 0.00000037161216 |
| 5 | 0.0000004645152 |
| 10 | 0.0000009290304 |
| 20 | 0.0000018580608 |
| 25 | 0.000002322576 |
| 50 | 0.000004645152 |
| 100 | 0.000009290304 |
| 250 | 0.00002322576 |
| 500 | 0.00004645152 |
| 1,000 | 0.00009290304 |
About these units
square footft²
The area of a square one foot on each side. The standard unit for US floor area.
square kilometerkm²
One million square metres. Used for land area and geographic regions.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.