A barn is a nuclear cross-section unit equal to 1e-28 square meters.
Barns to Ares Converter — b to a
Convert Barn (b) to Are (a) using the exact conversion factor (1 barn = 1e-30 are). See the formula, worked examples, and conversion table.
Barns to Ares converter
Converter
Area Converter
Convert land, construction, mapping, survey, and scientific area units.
Context values
Some unit families need one extra value for a physically accurate result.
An are is 100 square meters.
Result = input x 1e-28 / 100.
Area uses the square meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Barns to Ares
Comparing Barn and Are is common in agriculture and real estate, where US land is typically measured in acres and most of the rest of the world uses hectares. Specifically: A barn is a nuclear cross-section unit equal to 1e-28 square meters, and an are is 100 square meters.
Formula
ares = barns × 1e-30
This factor comes from each unit's defined relationship to the category's base unit: 1 barn equals 1e-28 base units, and 1 are equals 100 base units, so dividing one by the other gives the direct barn-to-are factor of 1e-30.
Simple example
1 b × 1e-30 = 1e-30 a
1 barn = 1e-30 ares.
Real-world example
10 b × 1e-30 = 1e-29 a
10 barns = 1e-29 ares.
Conversion table
| Barn (b) | Are (a) |
|---|---|
| 1 b | 1e-30 a |
| 5 b | 5e-30 a |
| 10 b | 1e-29 a |
| 25 b | 2.5e-29 a |
| 50 b | 5e-29 a |
| 100 b | 1e-28 a |
Reverse conversion: Are to Barn
1e-30 a × 1e+30 = 1 b
1e-30 ares = 1 barns.
barns = ares × 1e+30
For a page dedicated to this direction, see Are to Barn.
Understanding the Barn (b)
A barn is a nuclear cross-section unit equal to 1e-28 square meters.
Understanding the Are (a)
An are is 100 square meters.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ares are in 1 barn?
1 barn equals 1e-30 ares, using the exact defined conversion factor rather than an estimate.
How do I convert barn to are?
Multiply the barn value by 1e-30. The converter above does this instantly to whatever precision you set.
How do I convert are back to barn?
Use the reverse factor: 1 are equals 1e+30 barns. You can also use the swap control in the converter above to flip the direction instantly.
What is a barn?
Barn (b) is a unit of area.
What is a are?
Are (a) is a unit of area.
Is the barn to are conversion exact?
Yes. Both barn and are are defined by fixed standards rather than physical artifacts, so the factor of 1e-30 used above is exact to as many digits as you choose to display.