Square Feet to Square Kilometers
Convert square feet (ft²) to square kilometers (km²). Both measure surface measurement, and the conversion comes up in real estate, farming, construction work.
The Formula
``
square kilometers = square feet × 9.290304e-8
square feet = square kilometers × 10763910.4167
`
One square feet is 9.2903e-8 square kilometers, and one square kilometer is 10,763,910.42 square feet.
Conversion Table
| Square Feet | Square Kilometers |
|---|---|
| 1 ft² | 9.2903e-8 km² |
| 2 ft² | 1.8581e-7 km² |
| 5 ft² | 4.6452e-7 km² |
| 10 ft² | 9.2903e-7 km² |
| 25 ft² | 2.3226e-6 km² |
| 50 ft² | 4.6452e-6 km² |
| 100 ft² | 9.2903e-6 km² |
| 500 ft² | 4.6452e-5 km² |
| 1,000 ft² | 9.2903e-5 km² |
The Other Direction
| Square Kilometers | Square Feet |
|---|---|
| 1 km² | 10,763,910.42 ft² |
| 2 km² | 21,527,820.83 ft² |
| 5 km² | 53,819,552.08 ft² |
| 10 km² | 107,639,104.17 ft² |
| 25 km² | 269,097,760.42 ft² |
| 50 km² | 538,195,520.84 ft² |
| 100 km² | 1,076,391,041.67 ft² |
| 500 km² | 5,381,955,208.35 ft² |
| 1,000 km² | 10,763,910,416.7 ft² |
What Each Unit Is
Square Feet (ft²) — the area of a square one foot on each side, or 0.092903 square metres. The imperial unit US and UK property is advertised in.
Square Kilometers (km²) — one million square metres. The metric unit for regions, cities and land cover.
A Sense of Scale
A bedroom is 120–200 ft²- A US home averages 2,300 ft²
- A parking space is 130 ft²
- Central Park is 3.4 km²
- Manhattan is 59 km²
- Greater London is 1,572 km²
Precision
The factor 9.290304e-8 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.
In Code
`javascript
const squareFootToSquareKilometer = (value) => value * 9.290304e-8;
``
Where This Conversion Comes Up
- Real estate
- Farming
- Construction
- Landscaping
- Flooring
How Many Decimals Do You Need?
Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 ft² with the factor truncated at each decimal place:
| Decimals kept | Factor | 137 ft² becomes | Error |
|---|---|---|---|
| 0 | 0 | 0 | 100.0000% |
| 1 | 0 | 0 | 100.0000% |
| 2 | 0 | 0 | 100.0000% |
| 3 | 0 | 0 | 100.0000% |
| 4 | 0 | 0 | 100.0000% |
The right number of significant figures is set by your input, not by the converter. If you measured square feet to three significant figures, the answer in square kilometers is only good to three — writing more digits claims precision the measurement never had.