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# Convert Square Millimeter to Barn

Please provide values below to convert square millimeter [mm^2] to barn [b], or *vice versa*.

### Square Millimeter to Barn Conversion Table

Square Millimeter [mm^2] | Barn [b] |
---|---|

0.01 mm^2 | 1.0E+20 b |

0.1 mm^2 | 1.0E+21 b |

1 mm^2 | 1.0E+22 b |

2 mm^2 | 2.0E+22 b |

3 mm^2 | 3.0E+22 b |

5 mm^2 | 5.0E+22 b |

10 mm^2 | 1.0E+23 b |

20 mm^2 | 2.0E+23 b |

50 mm^2 | 5.0E+23 b |

100 mm^2 | 1.0E+24 b |

1000 mm^2 | 1.0E+25 b |

### How to Convert Square Millimeter to Barn

1 mm^2 = 1.0E+22 b

1 b = 1.0E-22 mm^2

**Example:** convert 15 mm^2 to b:

15 mm^2 = 15 × 1.0E+22 b = 1.5E+23 b