## Fret Spacing Formula

*x*_{n} = *x*_{o}—2 ^{n / 12}

The above formula can be used to calculate the required fret spacing, where *n* is the fret number, *x _{n}* is the distance of the fret from the bridge and

*x*is the scale length.

_{o}Lots of guitar making books will have tables for popular scales lengths to an accuracy greater than I could ever cut to. However, I just hate rounding errors. Also, by knowing the formula above, any scale length can be created, not just the ones provided. That said, here is a table for a scale length of 25″

Fret | Inches to bridge |
mm to bridge |
---|---|---|

Nut | 25.000 | 635.000 |

1 | 23.597 | 599.360 |

2 | 22.272 | 565.721 |

3 | 21.022 | 533.969 |

4 | 19.843 | 504.000 |

5 | 18.729 | 475.712 |

6 | 17.678 | 449.013 |

7 | 16.685 | 423.812 |

8 | 15.749 | 400.025 |

9 | 14.865 | 377.573 |

10 | 14.031 | 356.382 |

11 | 13.243 | 336.380 |

12 | 12.500 | 317.500 |

13 | 11.798 | 299.680 |

14 | 11.136 | 282.860 |

15 | 10.511 | 266.985 |

16 | 9.921 | 252.000 |

17 | 9.364 | 237.856 |

18 | 8.839 | 224.506 |

19 | 8.343 | 211.906 |

20 | 7.875 | 200.012 |

21 | 7.433 | 188.787 |

22 | 7.015 | 178.191 |

23 | 6.622 | 168.190 |

24 | 6.250 | 158.750 |

The following form can be used to calculate a table for any desired scale length. It uses the formula above and generates the measurements for 24 frets. Simple enter the scale length, and press the button.