Are to Square Kilometer Converter
Area · unit-converter
Convert Are 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: Are (a)
To: Square Kilometer (km2)
About Are
The are is 100 m². It is a metric land-area unit that sits between square meters and hectares.
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 ares to square kilometers
1 are is equal to 0.0001 square kilometer:
1 a = (100 m² ÷ 1000000 m²) km2 = 0.0001 km2
Each are is defined as 100 m² and each square kilometer as 1000000 m², so one a equals 100 ÷ 1000000 km2 = 0.0001 km2.
Let a(a) be the numeric value of the same area measured in Are (a), and a(km2) the value in Square Kilometer (km2). Then:
a(km2) = a(a) × (100 / 1000000)
Equivalently, divide by how many a fit into one km2 (m² per km2 divided by m² per a):
a(km2) = a(a) ÷ 10000
Or: square kilometer = are ÷ 10000
Examples
Example #1: Convert 20 a to square kilometer
20 a = 20 a × (100/1000000) km2 = 0.002 km2
20 a = 20 a ÷ 10000 = 0.002 km2
Example #2: Convert 50 a to square kilometer
50 a = 50 a × (100/1000000) km2 = 0.005 km2
50 a = 50 a ÷ 10000 = 0.005 km2
Summary
To convert Are to Square Kilometer, multiply the value in a by the ratio of square meters per a divided by square meters per km2. Equivalently: value_km2 = value_a × (100 / 1000000). Numerically, 1 a equals 0.0001 km2.
Relationship context
Both units are metric (SI) and tied to the square meter. Conversions use exact ratios from their m² definitions. The factor from Are to Square Kilometer is 1.000000e-4 (1 a = 0.0001 km2).
Conversion tables
| Are (a) | Square Kilometer (km2) |
|---|---|
| 0.1 | 0.00001 |
| 1 | 0.0001 |
| 2 | 0.0002 |
| 3 | 0.0003 |
| 4 | 0.0004 |
| 5 | 0.0005 |
| 6 | 0.0006 |
| 7 | 0.0007 |
| 8 | 0.0008 |
| 9 | 0.0009 |
| Are (a) | Square Kilometer (km2) |
|---|---|
| 10 | 0.001 |
| 20 | 0.002 |
| 30 | 0.003 |
| 40 | 0.004 |
| 50 | 0.005 |
| 60 | 0.006 |
| 70 | 0.007 |
| 80 | 0.008 |
| 90 | 0.009 |
| 100 | 0.01 |