Convert 1 barn to square millimeter

1 b (barn) is equal to 0.0000000000000000000001 mm² (square millimeter). To convert from barn to square millimeter, multiply by 0.0000000000000000000001 or divide by 10,000,000,000,000,000,000,000.

• 1 b × 1.0E-22 = 1.0E-22 mm²
• 1 b ÷ 1.0E+22 = 1.0E-22 mm²