A barn is a nuclear cross-section unit equal to 1e-28 square meters.
Barns to Square Decameters Converter — b to dam2
Convert Barn (b) to Square Decameter (dam2) using the exact conversion factor (1 barn = 1e-30 square decameter). See the formula, worked examples, and conversion table.
Barns to Square Decameters 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.
Square metric area unit.
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 Square Decameters
Comparing Barn and Square Decameter 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 square metric area unit.
Formula
square decameters = 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 square decameter equals 100 base units, so dividing one by the other gives the direct barn-to-square decameter factor of 1e-30.
Simple example
1 b × 1e-30 = 1e-30 dam2
1 barn = 1e-30 square decameters.
Real-world example
10 b × 1e-30 = 1e-29 dam2
10 barns = 1e-29 square decameters.
Conversion table
| Barn (b) | Square Decameter (dam2) |
|---|---|
| 1 b | 1e-30 dam2 |
| 5 b | 5e-30 dam2 |
| 10 b | 1e-29 dam2 |
| 25 b | 2.5e-29 dam2 |
| 50 b | 5e-29 dam2 |
| 100 b | 1e-28 dam2 |
Reverse conversion: Square Decameter to Barn
1e-30 dam2 × 1e+30 = 1 b
1e-30 square decameters = 1 barns.
barns = square decameters × 1e+30
For a page dedicated to this direction, see Square Decameter to Barn.
Understanding the Barn (b)
A barn is a nuclear cross-section unit equal to 1e-28 square meters.
Understanding the Square Decameter (dam2)
Square metric area unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many square decameters are in 1 barn?
1 barn equals 1e-30 square decameters, using the exact defined conversion factor rather than an estimate.
How do I convert barn to square decameter?
Multiply the barn value by 1e-30. The converter above does this instantly to whatever precision you set.
How do I convert square decameter back to barn?
Use the reverse factor: 1 square decameter 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 square decameter?
Square Decameter (dam2) is a unit of area.
Is the barn to square decameter conversion exact?
Yes. Both barn and square decameter 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.