Square meters to barns
Type a value in m² to get it in b instantly.
1×10²⁸b
That's 3,846,153,846,153,846,000,000× as big as xenon-135 absorption — nothing on our list beats it. A disc that size would have a radius of about 5.642×10¹⁴ fm.
Convert the other way: b to m²
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 m² to b
To convert square meters to barns, multiply by 1×10²⁸.
Example: 1 m² × 1×10²⁸ = 1×10²⁸ b.
In the other direction, 1 b = 1×10⁻²⁸ m².
Every unit
Your cross section in every unit
Tables
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 |
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 |
Quick answers
Quick answers
- How many b is 1 m²?
- 1 m² is 1×10²⁸ b.
- How many b is 10 m²?
- 10 m² is 1×10²⁹ b.
The units
About these units
Square meters (m²)
The SI form, full of negative exponents.
Barns (b)
10⁻²⁸ m², roughly the area of a heavy nucleus.
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