Barns to Square Centimeters: the quick answer
1 b = 1 × 10⁻²⁴ cm²
1 barn equals 1 × 10⁻²⁴ square centimeters
To convert barns to square centimeters, multiply the value by 1 × 10⁻²⁴. To go the other way, multiply square centimeters by 1 × 10²⁴ to get barns.