Are to Square Kilometer Converter

Area Converter

20 units available

Decimals:

From

To

0.0001

1 a = 0.0001 km²

Formula:

km² = a × 0.0001

With your value: 1 a = 0.0001 km²

How big is that?

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

A4 sheet (1/1.6e+3 your value)0.000625 a

Parking space (1/8.0 your value)0.125 a

Your value1.00 a

Tennis court (2.6× your value)2.61 a

Football pitch (71× your value)71.4 a

Hectare (1.0e+2× your value)100 a

Other Are to Square Kilometer conversions

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

Are to Square Kilometer Conversion Table

Are (a)	Square Kilometer (km²)
0.5	5.000000e-5
1	0.0001
2	0.0002
5	0.0005
10	0.001
15	0.0015
20	0.002
25	0.0025
50	0.005
100	0.01
250	0.025
500	0.05
1000	0.1

Square Kilometer to Are Conversion Table

Square Kilometer (km²)	Are (a)
0.5	5,000
1	10,000
2	20,000
5	50,000
10	100,000
15	150,000
20	200,000
25	250,000
50	500,000
100	1,000,000
250	2,500,000
500	5,000,000
1000	10,000,000

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.

Are (a)

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 Are to Square Kilometer

To convert from Are (a) to Square Kilometer (km²), multiply the value by 0.0001.

Formula: km² = a × 0.0001

Reverse: a = km² × 10,000

Step-by-Step Example

Start with your value in Are. For example: 5 a
Multiply by the conversion factor: 5 x 0.0001
The result is: 0.0005 km²

About Are

The are (a) is a unit of area. One are equals 100 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.

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 Are?

There are exactly 0.0001 Square Kilometer in 1 Are. This means the conversion factor from Are to Square Kilometer is 0.0001.

What is the formula to convert Are to Square Kilometer?

The formula to convert Are to Square Kilometer is: km² = a × 0.0001. For example, to convert 10 Are to Square Kilometer, you would multiply 10 by 0.0001.

What is a Are?