Convert Square Feet to Square Kilometres (ft2 to km2)
1 square foot (ft²) = 9.290304 × 10⁻⁸ square kilometres (km²). 1 km² = 10763910.42 ft². Example: 15 ft² = 15 × 9.290304 × 10⁻⁸ = 0.0000013935456 km².
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1 ft² = 9.290304e-8 km²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk square foot to square kilometre converter to paste a column from Excel.
How to Convert Square Foot to Square Kilometre
- 1 ft² = 9.290304 × 10⁻⁸ km²
- 1 km² = 10763910.42 ft²
- Example: convert 15 ft² to km²: 15 ft² = 15 × 9.290304 × 10⁻⁸ km² = 0.0000013935456 km²
Formula
km² = ft² × 9.290304 × 10⁻⁸
or km² = ft² ÷ 10763910.41671
Derivation from SI units:
- 1 ft² = (0.3048 m)² = 0.09290304 m²
- 1 km² = (1000 m)² = 10⁶ m² = 100 ha
- 1 ft² = 0.09290304 m² ÷ 1000000 m² per km² = 9.290304 × 10⁻⁸ km²
Both units are defined exactly, so the factor is exact. Square Foot definition: square foot; Square Kilometre definition: square kilometre.
Worked examples
- A reading of 5 ft² converts to 4.645152 × 10⁻⁷ km².
5 ft² × 9.290304 × 10⁻⁸ = 4.645152 × 10⁻⁷ km² - A value of 500 ft² is 0.00004645152 km².
500 ft² × 9.290304 × 10⁻⁸ = 0.00004645152 km²
Square Foot to Square Kilometre conversion table
| Square Feet (ft²) | Square Kilometres (km²) |
|---|---|
| 0.1 ft² | 9.290304 × 10⁻⁹ km² |
| 0.25 ft² | 2.322576 × 10⁻⁸ km² |
| 0.5 ft² | 4.645152 × 10⁻⁸ km² |
| 1 ft² | 9.290304 × 10⁻⁸ km² |
| 2 ft² | 1.8580608 × 10⁻⁷ km² |
| 4 ft² | 3.7161216 × 10⁻⁷ km² |
| 5 ft² | 4.645152 × 10⁻⁷ km² |
| 10 ft² | 9.290304 × 10⁻⁷ km² |
| 25 ft² | 0.000002322576 km² |
| 50 ft² | 0.000004645152 km² |
| 100 ft² | 0.000009290304 km² |
| 200 ft² | 0.000018580608 km² |
| 500 ft² | 0.00004645152 km² |
| 1000 ft² | 0.00009290304 km² |
| 1500 ft² | 0.00013935456 km² |
| 2000 ft² | 0.00018580608 km² |
| 2500 ft² | 0.0002322576 km² |
| 5000 ft² | 0.0004645152 km² |
| 43560 ft² | 0.004046856422 km² |
Where it's used
Square Feet are used for US floor and building areas, while square kilometres appear in city, lake and country areas. Both measure area, so the conversion is a fixed factor.
Square Foot to other area units
| Conversion | 1 ft² equals |
|---|---|
| square foot to square kilometre | 9.290304 × 10⁻⁸ km² |
| square foot to square meter | 0.09290304 m² |
| square foot to square centimeter | 929.0304 cm² |
| square foot to square inch | 144 in² |
| square foot to hectare | 0.000009290304 ha |
| square foot to acre | 0.00002295684114 ac |
| square foot to square millimeter | 92903.04 mm² |
| square foot to square yard | 0.1111111111 yd² |
Show 1 more units
| square foot to square mile | 3.587006428 × 10⁻⁸ mi² |
|---|
Frequently asked questions
How many square kilometres are in 1 square foot?
1 ft² = 9.290304 × 10⁻⁸ km².
How do I convert square feet to square kilometres?
Multiply the value in ft² by 9.290304 × 10⁻⁸, or divide it by 10763910.42. For example, 15 ft² × 9.290304 × 10⁻⁸ = 0.0000013935456 km².
Is the ft² to km² conversion exact?
Yes. Both units are defined exactly, and 1 ft² is exactly 9.290304 × 10⁻⁸ km².
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "square foot (ft²)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Square Feet to Square Kilometres (ft2 to km2). Retrieved October 25, 2026, from https://scientificconverters.com/area/square-feet-to-square-kilometers/
IEEE
Scientific Converters, "Convert Square Feet to Square Kilometres (ft2 to km2)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/area/square-feet-to-square-kilometers/