Barns to square meters
Type a value in b to get it in m² instantly.
1×10⁻²⁸m²
That's 100,000,000,000,000,000,000× as big as a neutrino interaction, while ordinary neutron scattering is 4× bigger. A disc that size would have a radius of about 5.642 fm.
Convert the other way: m² to b
What it means
How big a target is that?
A cross section is an effective area, not a physical one. A strongly absorbing nucleus can present a target far larger than itself.
The math
How to convert b to m²
To convert barns to square meters, multiply by 1×10⁻²⁸.
Example: 1 b × 1×10⁻²⁸ = 1×10⁻²⁸ m².
In the other direction, 1 m² = 1×10²⁸ b.
Every unit
Your cross section in every unit
Tables
b to m² conversion table
| b | m² |
|---|---|
| 0.001 b | 1×10⁻³¹ m² |
| 0.01 b | 1×10⁻³⁰ m² |
| 0.1 b | 1×10⁻²⁹ m² |
| 1 b | 1×10⁻²⁸ m² |
| 10 b | 1×10⁻²⁷ m² |
| 100 b | 1×10⁻²⁶ m² |
| 585 b | 5.85×10⁻²⁶ m² |
| 1,000 b | 1×10⁻²⁵ m² |
| 10,000 b | 1×10⁻²⁴ m² |
| 1,000,000 b | 1×10⁻²² m² |
m² to b conversion table
| m² | b |
|---|---|
| 0.001 m² | 1×10²⁵ b |
| 0.01 m² | 1×10²⁶ b |
| 0.1 m² | 1×10²⁷ b |
| 1 m² | 1×10²⁸ b |
| 10 m² | 1×10²⁹ b |
| 100 m² | 1×10³⁰ b |
| 585 m² | 5.85×10³⁰ b |
| 1,000 m² | 1×10³¹ b |
| 10,000 m² | 1×10³² b |
| 1,000,000 m² | 1×10³⁴ b |
Quick answers
Quick answers
- How many m² is 1 b?
- 1 b is 1×10⁻²⁸ m².
- How many m² is 10 b?
- 10 b is 1×10⁻²⁷ m².
The units
About these units
Barns (b)
10⁻²⁸ m², roughly the area of a heavy nucleus.
Square meters (m²)
The SI form, full of negative exponents.
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