Barn to Are Converter

Area Converter

20 units available

Decimals:

From

To

1.000000e-30

1 b = 1.000000e-30 a

Formula:

a = b × 1.000000e-30

With your value: 1 b = 1.000000e-30 a

How big is that?

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

Your value1.00 b

Postage stamp (6.0e+24× your value)6.00e+24 b

A4 sheet (6.2e+26× your value)6.25e+26 b

Parking space (1.3e+29× your value)1.25e+29 b

Tennis court (2.6e+30× your value)2.61e+30 b

Football pitch (7.1e+31× your value)7.14e+31 b

Other Barn to Are conversions

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

Barn to Are Conversion Table

Barn (b)	Are (a)
0.5	5.000000e-31
1	1.000000e-30
2	2.000000e-30
5	5.000000e-30
10	1.000000e-29
15	1.500000e-29
20	2.000000e-29
25	2.500000e-29
50	5.000000e-29
100	1.000000e-28
250	2.500000e-28
500	5.000000e-28
1000	1.000000e-27

Are to Barn Conversion Table

Are (a)	Barn (b)
0.5	5.000000e+29
1	1.000000e+30
2	2.000000e+30
5	5.000000e+30
10	1.000000e+31
15	1.500000e+31
20	2.000000e+31
25	2.500000e+31
50	5.000000e+31
100	1.000000e+32
250	2.500000e+32
500	5.000000e+32
1000	1.000000e+33

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.

Barn (b)

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

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

How to Convert Barn to Are

To convert from Barn (b) to Are (a), multiply the value by 1.000000e-30.

Formula: a = b × 1.000000e-30

Reverse: b = a × 1.000000e+30

Step-by-Step Example

Start with your value in Barn. For example: 5 b
Multiply by the conversion factor: 5 x 1.000000e-30
The result is: 5.000000e-30 a

About Barn

The barn (b) is a unit of area. One barn equals 1.000000 × 10^-28 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 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.

Frequently Asked Questions

How many Are are in 1 Barn?

There are exactly 1.000000e-30 Are in 1 Barn. This means the conversion factor from Barn to Are is 1.000000e-30.

What is the formula to convert Barn to Are?

The formula to convert Barn to Are is: a = b × 1.000000e-30. For example, to convert 10 Barn to Are, you would multiply 10 by 1.000000e-30.

What is a Barn?