Square Foot to Square Kilometer Converter

Area Converter

20 units available

Decimals:

From

To

9.290304e-8

1 ft² = 9.290304e-8 km²

Formula:

km² = ft² × 9.290304e-8

With your value: 1 ft² = 9.290304e-8 km²

How big is that?

Everyday references on a logarithmic scale, all expressed in square foot so you can sanity-check the result.

Postage stamp (1/1.5e+2 your value)0.00646 ft²

A4 sheet (1/1.5 your value)0.673 ft²

Your value1.00 ft²

Parking space (1.3e+2× your value)135 ft²

Tennis court (2.8e+3× your value)2.81e+3 ft²

Football pitch (7.7e+4× your value)7.69e+4 ft²

Other Square Foot to Square Kilometer conversions

2 ft² to km² 3 ft² to km² 4 ft² to km² 5 ft² to km² 6 ft² to km² 7 ft² to km² 8 ft² to km²

Square Foot to Square Kilometer Conversion Table

Square Foot (ft²)	Square Kilometer (km²)
0.5	4.645152e-8
1	9.290304e-8
2	1.858061e-7
5	4.645152e-7
10	9.290304e-7
15	1.393546e-6
20	1.858061e-6
25	2.322576e-6
50	4.645152e-6
100	9.290304e-6
250	2.322576e-5
500	4.645152e-5
1000	9.290304e-5

Square Kilometer to Square Foot Conversion Table

Square Kilometer (km²)	Square Foot (ft²)
0.5	5,381,955.208355
1	10,763,910.41671
2	21,527,820.833419
5	53,819,552.083549
10	107,639,104.167097
15	161,458,656.250646
20	215,278,208.334194
25	269,097,760.417743
50	538,195,520.835486
100	1,076,391,041.670972
250	2,690,977,604.177431
500	5,381,955,208.354861
1000	10,763,910,416.709723

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Square Foot (ft²)

Area

Exact conversion

Derived from the square metre via the length definitions above.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Square Kilometer (km²)

Area

Exact conversion

Derived from the square metre via the length definitions above.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Square Foot to Square Kilometer

To convert from Square Foot (ft²) to Square Kilometer (km²), multiply the value by 9.290304e-8.

Formula: km² = ft² × 9.290304e-8

Reverse: ft² = km² × 10,763,910.416709721

Step-by-Step Example

Start with your value in Square Foot. For example: 5 ft²
Multiply by the conversion factor: 5 x 9.290304e-8
The result is: 4.645152e-7 km²

About Square Foot

The square foot is an imperial unit of area equal to a square with sides of 1 foot. It is the standard unit for real estate in the US.

Common uses: real estate (US), flooring, construction.

About Square Kilometer

The square kilometer (km²) is a unit of area. One square kilometer equals 1.000000 × 10^+6 square metres. UnitConvertLab converts it against every other area unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: area calculations, engineering and science, education.

Frequently Asked Questions

How many Square Kilometer are in 1 Square Foot?

There are exactly 9.290304e-8 Square Kilometer in 1 Square Foot. This means the conversion factor from Square Foot to Square Kilometer is 9.290304e-8.

What is the formula to convert Square Foot to Square Kilometer?

The formula to convert Square Foot to Square Kilometer is: km² = ft² × 9.290304e-8. For example, to convert 10 Square Foot to Square Kilometer, you would multiply 10 by 9.290304e-8.

What is a Square Foot?