# Lumber Dimensions

2x4s are not actually 2 inches by 4 inches. When the board is first rough
sawn from the log, it is a true 2x4, but the drying process and planing
of the board reduce it to the finished 1.5x3.5 size. Here are the common
sizes of lumber, and their actual sizes.

Nominal |
Actual |
Actual
- Metric |

1" x 2" |
3/4" x 1-1/2" |
19
x 38 mm |

1" x 3" |
3/4" x 2-1/2" |
19
x 64 mm |

1" x 4" |
3/4" x 3-1/2" |
19
x 89 mm |

1" x 5" |
3/4" x 4-1/2" |
19
x 114 mm |

1" x 6" |
3/4" x 5-1/2" |
19
x 140 mm |

1" x 7" |
3/4" x 6-1/4" |
19
x 159 mm |

1" x 8" |
3/4" x 7-1/4" |
19
x 184 mm |

1" x 10" |
3/4" x 9-1/4" |
19
x 235 mm |

1" x 12" |
3/4" x 11-1/4" |
19
x 286 mm |

1-1/4" x 4" |
1" x 3-1/2" |
25
x 89 mm |

1-1/4" x 6" |
1" x 5-1/2" |
25
x 140 mm |

1-1/4" x 8" |
1" x 7-1/4" |
25
x 184 mm |

1-1/4" x 10" |
1" x 9-1/4" |
25
x 235 mm |

1-1/4" x 12" |
1" x 11-1/4" |
25
x 286 mm |

1-1/2" x 4" |
1-1/4" x 3-1/2" |
32
x 89 mm |

1-1/2" x 6" |
1-1/4" x 5-1/2" |
32
x 140 mm |

1-1/2" x 8" |
1-1/4" x 7-1/4" |
32
x 184 mm |

1-1/2" x 10" |
1-1/4" x 9-1/4" |
32
x 235 mm |

1-1/2" x 12" |
1-1/4" x 11-1/4" |
32
x 286 mm |

2" x 2" |
1-1/2" x 1-1/2" |
38 x 38 mm |

2" x 4" |
1-1/2" x 3-1/2" |
38
x 89 mm |

2" x 6" |
1-1/2" x 5-1/2" |
38
x 140 mm |

2" x 8" |
1-1/2" x 7-1/4" |
38
x 184 mm |

2" x 10" |
1-1/2" x 9-1/4" |
38
x 235 mm |

2" x 12" |
1-1/2" x 11-1/4" |
38
x 286 mm |

3" x 6" |
2-1/2" x 5-1/2" |
64
x 140 mm |

4" x 4" |
3-1/2" x 3-1/2" |
89
x 89 mm |

4" x 6" |
3-1/2" x 5-1/2" |
89
x 140 mm |