Square Feet to Square Kilometer Converter
Area · unit-converter
Convert Square Feet to Square Kilometer with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use square-meter-based definitions (international feet / yard standards, acre, hectare, and regional units like pyeong/tsubo).
Calculator
From: Square Feet (ft2)
To: Square Kilometer (km2)
About Square Feet
Square feet (ft²) measure area; one ft² is a square with sides of 0.3048 m (international feet-based definitions). Real estate, interior design, and HVAC often use square feet.
About Square Kilometer
The square kilometer is a metric unit equal to one million square meters. It is standard for city sizes, large properties, and regional planning in metric countries.
How to convert square feet to square kilometers
1 square feet is equal to 9.29030400e-8 square kilometer:
1 ft2 = (0.09290304 m² ÷ 1000000 m²) km2 = 9.29030400e-8 km2
Each square feet is defined as 0.09290304 m² and each square kilometer as 1000000 m², so one ft2 equals 0.09290304 ÷ 1000000 km2 = 9.29030400e-8 km2.
Let a(ft2) be the numeric value of the same area measured in Square Feet (ft2), and a(km2) the value in Square Kilometer (km2). Then:
a(km2) = a(ft2) × (0.09290304 / 1000000)
Equivalently, divide by how many ft2 fit into one km2 (m² per km2 divided by m² per ft2):
a(km2) = a(ft2) ÷ 1.07639104e+7
Or: square kilometer = square feet ÷ 1.07639104e+7
Examples
Example #1: Convert 20 ft2 to square kilometer
20 ft2 = 20 ft2 × (0.09290304/1000000) km2 = 0.0000018581 km2
20 ft2 = 20 ft2 ÷ 1.07639104e+7 = 0.0000018581 km2
Example #2: Convert 50 ft2 to square kilometer
50 ft2 = 50 ft2 × (0.09290304/1000000) km2 = 0.0000046452 km2
50 ft2 = 50 ft2 ÷ 1.07639104e+7 = 0.0000046452 km2
Summary
To convert Square Feet to Square Kilometer, multiply the value in ft2 by the ratio of square meters per ft2 divided by square meters per km2. Equivalently: value_km2 = value_ft2 × (0.09290304 / 1000000). Numerically, 1 ft2 equals 9.290304000000001e-8 km2.
Relationship context
You are converting between US customary / imperial (Square Feet) and metric (SI) (Square Kilometers). Metric area is decimal from the square meter; US/imperial units use feet, yards, miles, and acres tied to international feet (0.3048 m) and related definitions. The numeric factor used here is 9.290304e-8.
Conversion tables
| Square Feet (ft2) | Square Kilometer (km2) |
|---|---|
| 0.1 | 0.0000000093 |
| 1 | 0.0000000929 |
| 2 | 0.0000001858 |
| 3 | 0.0000002787 |
| 4 | 0.0000003716 |
| 5 | 0.0000004645 |
| 6 | 0.0000005574 |
| 7 | 0.0000006503 |
| 8 | 0.0000007432 |
| 9 | 0.0000008361 |
| Square Feet (ft2) | Square Kilometer (km2) |
|---|---|
| 10 | 0.000000929 |
| 20 | 0.0000018581 |
| 30 | 0.0000027871 |
| 40 | 0.0000037161 |
| 50 | 0.0000046452 |
| 60 | 0.0000055742 |
| 70 | 0.0000065032 |
| 80 | 0.0000074322 |
| 90 | 0.0000083613 |
| 100 | 0.0000092903 |