Convert square feet (ft²) to square kilometres (km²).
Area converter
Instant conversion
Edit either value. Decimals and scientific notation supported.
1
ft²
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Square metrem²
Square kilometrekm²
Square centimetrecm²
Square millimetremm²
Square footft²
Square inchin²
Square yardyd²
Acreac
Hectareha
Square milemi²
Roodrood
No units found. Try a name or symbol.
9.290304e-8
km²
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Square metrem²
Square kilometrekm²
Square centimetrecm²
Square millimetremm²
Square footft²
Square inchin²
Square yardyd²
Acreac
Hectareha
Square milemi²
Roodrood
No units found. Try a name or symbol.
CONVERSION
1 ft² ≈ 9.290304e-8 km²
6 significant figures
10 significant figures
15 significant figures
Precision changes displayed rounding, not calculation accuracy.
FORMULAkm² = ft² × 9.290304e-8
FORMULA & EXAMPLES
How to convert Square feet to square kilometres
km² = ft² × 9.290304e-8
Multiply the ft² reading by 9.290304e-8.
Worked examples
1 ft² ≈ 9.290304e-8 km²
1 × 9.290304e-8 ≈ 9.290304e-8
100 ft² ≈ 0.000009290304 km²
100 × 9.290304e-8 ≈ 0.000009290304
Frequently asked questions
Why is ft² to km² different from a length conversion?
Area factors scale with the square of the length factor. For example, 1 ft = 0.3048 m gives 1 ft² = 0.3048² m² = 0.09290304 m².
Square feet to square kilometres table
Fixed reference · Square foot to Square kilometre
Reference values use this page’s named pair and default context. Calculator precision and font settings do not change this table.
Square foot (ft²)
Square kilometre (km²)
0
0
0.1
9.290304e-9
0.5
4.645152e-8
1
9.290304e-8
2
1.8580608e-7
5
4.645152e-7
10
9.290304e-7
25
0.000002322576
50
0.000004645152
100
0.000009290304
1000
0.00009290304
Table results use 10 significant figures; decimal formula coefficients use up to 15. Calculations use the unit definitions before rounding. Extra digits do not improve measurement accuracy.