Convert barn [b] to square kilometer [km^2] Online | Free area Converter

Barn [b]


A barn (b) is a very small unit of area used mainly in nuclear and particle physics to measure the cross-sectional area of atomic nuclei and particles.

1 barn = 10⁻²⁸ square meters (m²).

The name "barn" humorously refers to something “as big as a barn” in the tiny world of atomic scales, despite its extremely small size.


Square Kilometer [km²]


A square kilometer (km²) is a unit of area equal to a square that is 1 kilometer on each side. It is commonly used to measure large areas such as cities, countries, or large land plots.

1 km² = 1,000,000 m².




Popular Area Unit Conversions

Convert barn [b] to Other Area Units