A barn is a nuclear cross-section unit equal to 1e-28 square meters.
Barns to Square Nanometers Converter — b to nm2
Convert Barn (b) to Square Nanometer (nm2) using the exact conversion factor (1 barn = 1e-10 square nanometer). See the formula, worked examples, and conversion table.
Barns to Square Nanometers 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 / 1e-18.
Area uses the square meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Barns to Square Nanometers
Comparing Barn and Square Nanometer 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 nanometers = barns × 1e-10
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 nanometer equals 1e-18 base units, so dividing one by the other gives the direct barn-to-square nanometer factor of 1e-10.
Simple example
1 b × 1e-10 = 1e-10 nm2
1 barn = 1e-10 square nanometers.
Real-world example
10 b × 1e-10 = 1e-9 nm2
10 barns = 1e-9 square nanometers.
Conversion table
| Barn (b) | Square Nanometer (nm2) |
|---|---|
| 1 b | 1e-10 nm2 |
| 5 b | 5e-10 nm2 |
| 10 b | 1e-9 nm2 |
| 25 b | 2.5e-9 nm2 |
| 50 b | 5e-9 nm2 |
| 100 b | 1e-8 nm2 |
Reverse conversion: Square Nanometer to Barn
1e-10 nm2 × 10000000000 = 1 b
1e-10 square nanometers = 1 barns.
barns = square nanometers × 10000000000
For a page dedicated to this direction, see Square Nanometer to Barn.
Understanding the Barn (b)
A barn is a nuclear cross-section unit equal to 1e-28 square meters.
Understanding the Square Nanometer (nm2)
Square metric area unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many square nanometers are in 1 barn?
1 barn equals 1e-10 square nanometers, using the exact defined conversion factor rather than an estimate.
How do I convert barn to square nanometer?
Multiply the barn value by 1e-10. The converter above does this instantly to whatever precision you set.
How do I convert square nanometer back to barn?
Use the reverse factor: 1 square nanometer equals 10,000,000,000 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 nanometer?
Square Nanometer (nm2) is a unit of area.
Is the barn to square nanometer conversion exact?
Yes. Both barn and square nanometer are defined by fixed standards rather than physical artifacts, so the factor of 1e-10 used above is exact to as many digits as you choose to display.