Barns to square femtometers
Type a value in b to get it in fm² instantly.
100fm²
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.
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 fm²
To convert barns to square femtometers, multiply by 100.
Example: 1 b × 100 = 100 fm².
In the other direction, 1 fm² = 0.01 b.
Every unit
Your cross section in every unit
Tables
b to fm² conversion table
| b | fm² |
|---|---|
| 0.001 b | 0.1 fm² |
| 0.01 b | 1 fm² |
| 0.1 b | 10 fm² |
| 1 b | 100 fm² |
| 10 b | 1,000 fm² |
| 100 b | 10,000 fm² |
| 585 b | 58,500 fm² |
| 1,000 b | 100,000 fm² |
| 10,000 b | 1,000,000 fm² |
| 1,000,000 b | 100,000,000 fm² |
fm² to b conversion table
| fm² | b |
|---|---|
| 0.001 fm² | 1×10⁻⁵ b |
| 0.01 fm² | 0.0001 b |
| 0.1 fm² | 0.001 b |
| 1 fm² | 0.01 b |
| 10 fm² | 0.1 b |
| 100 fm² | 1 b |
| 585 fm² | 5.85 b |
| 1,000 fm² | 10 b |
| 10,000 fm² | 100 b |
| 1,000,000 fm² | 10,000 b |
Quick answers
Quick answers
- How many fm² is 1 b?
- 1 b is 100 fm².
- How many fm² is 10 b?
- 10 b is 1,000 fm².
The units
About these units
Barns (b)
10⁻²⁸ m², roughly the area of a heavy nucleus.
Square femtometers (fm²)
The natural nuclear area unit: 100 of them make a barn.
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