Length · Unit Converter

Convert Are to Square Kilometer

Convert ares to square kilometers instantly. 1 are = 0.0001 square kilometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Kilometer to Are converter for the reverse conversion.

Written by Sunith Babu L, Ph.D., Lead Engineer Reviewed by Girish V Kulkarni Ph.D.
Length category 2 min read Published Last reviewed Updated

Units explained

Metric / SI

Are

What is a are?

An are is a metric unit of area equal to 100 square meters. It is used in some European countries for land measurement, especially for smaller plots like vineyards and gardens.

Origin of the are

Introduced as part of the French metric system in 1795. The name comes from the Latin 'area' meaning surface or open ground.

Where it is used

Ares are still used in some European countries (especially Switzerland and France) for small-plot land measurement. In Switzerland, an are is a common unit for vineyard size. Most modern contexts prefer square meters or hectares.

When and where it was developed

Defined in 1795 in France as part of the original metric system.

Metric / SI

Square Kilometer

What is a square kilometer?

A square kilometer is a metric unit of area equal to 1,000,000 m² (one million square meters), or 100 hectares. It is used for measuring large land areas, regional geography, and country-scale statistics.

Origin of the square kilometer

Derived by squaring the kilometer (1000 m). The kilo- prefix comes from the Greek 'chilioi' (thousand).

Where it is used

Square kilometers express the area of cities, districts, lakes, forests, and entire countries. India's total area is approximately 3,287,263 km². 1 km² equals 100 hectares or about 247.105 acres.

When and where it was developed

Kilometer has been part of the metric system since 1795.

Are to Square Kilometer conversion formula

The relationship between ares and square kilometers:

1 a = 0.0001 km²
1 km² = 10000 a

To convert ares to square kilometers, multiply the value in ares by 0.0001. To reverse, multiply square kilometers by 10000.

How to use this converter

Type a value into the calculator. The result in square kilometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Square Kilometer to Are converter for the reverse direction.

Step-by-step: convert ares to square kilometers

  1. Write down the value in ares (a).
  2. Multiply that value by the factor 0.0001.
  3. The product is the equivalent value in square kilometers (km²).
  4. To reverse, multiply the square kilometer value by 10000.

Worked examples

Example 1 — Convert 1 a to km²:
1 × 0.0001 = 0.0001 km²

Example 2 — Convert 100 a to km²:
100 × 0.0001 = 0.01 km²

Are to Square Kilometer conversion table

Standard reference values for converting ares to square kilometers:

Are [a]Square Kilometer [km²]
0.011e-6
0.11e-5
10.0001
20.0002
30.0003
40.0004
50.0005
100.001
200.002
300.003
400.004
500.005
1000.01
5000.05
10000.1

Frequently asked questions

How many square kilometers is 1 are?
1 are equals 0.0001 square kilometer.
How do I convert ares to square kilometers?
Multiply the value in ares by 0.0001 to get square kilometers.
How do I convert square kilometers back to ares?
Multiply the value in square kilometers by 10000, or use the Square Kilometer to Are converter.
How many square kilometers is 100 ares?
100 ares equals 0.01 square kilometers, because 100 × 0.0001 = 0.01.

Convert Are to other area units

Show all Are conversions
Metric / SI (15 units)
Are to Square Yoctometer (ym²) Are to Square Zeptometer (zm²) Are to Square Attometer (am²) Are to Square Femtometer (fm²) Are to Square Picometer (pm²) Are to Square Nanometer (nm²) Are to Square Micrometer (µm²) Are to Square Millimeter (mm²) Are to Square Centimeter (cm²) Are to Square Decimeter (dm²) Are to Square Meter (m²) Are to Square Dekameter (dam²) Are to Square Hectometer (hm²) Are to Hectare (ha) Are to Square Kilometer (km²)
Imperial / US Customary (3 units)
Are to Square Inch (in²) Are to Square Foot (ft²) Are to Acre (ac)

Sources & references

Conversion factor (1 a = 0.0001 km²) verified against the following authoritative sources:

Results are provided for general reference. Verify critical measurements against an authoritative standard.