To convert barns to square kilometers, multiply the value by 1 × 10⁻³⁴. To go the other way, multiply square kilometers by 1 × 10³⁴ to get barns.
| Barns (b) | Square Kilometers (km²) |
|---|---|
| 1 b | 1 × 10⁻³⁴ km² |
| 2 b | 2 × 10⁻³⁴ km² |
| 5 b | 5 × 10⁻³⁴ km² |
| 10 b | 1 × 10⁻³³ km² |
| 20 b | 2 × 10⁻³³ km² |
| 50 b | 5 × 10⁻³³ km² |
| 100 b | 1 × 10⁻³² km² |
| 500 b | 5 × 10⁻³² km² |
| 1,000 b | 1 × 10⁻³¹ km² |
Barn (b). A barn is 10⁻²⁸ m², the unit particle physicists use for nuclear cross-sections.
Square kilometer (km²). A square kilometer is one million square meters (100 hectares), used for countries, cities and lakes.
There are 1 × 10⁻³⁴ square kilometers in one barn.
Multiply the number of barns by 1 × 10⁻³⁴. For example, 10 barns equal 1 × 10⁻³³ square kilometers.
One square kilometer equals 1 × 10³⁴ barns.