Enter the number of frets and the fret to fret distance (in) into the Scale Length Calculator. The calculator will evaluate the Scale Length. 

Scale Length Formula

The following two example problems outline the steps and information needed to calculate the Scale Length.


  • Where SCL is the Scale Length (inches)
  • #F is the number of frets 
  • FTFD is the fret to fret distance (in) 

How to Calculate Scale Length?

The following example problems outline how to calculate Scale Length.

Example Problem #1:

  1. First, determine the number of frets. 
    • The number of frets is given as: 12.
  2. Next, determine the fret to fret distance (in). 
    • The fret to fret distance (in) is provided as: 1.5.
  3. Finally, calculate the Scale Length using the equation above: 


The values provided above are inserted into the equation below and computed.

SCL = 12 * 1.5 = 18 (inches)

Example Problem #2: 

For this problem, the variables required are provided below:

number of frets = 6

fret to fret distance (in) = 3

Test your knowledge using the equation and check your answer with the calculator..

SCL = #F * FTFD = ?