Frets are useful little ridges that help you adjust the length of the string you want to vibrate. There are pretty complex ways of calculating the exact location of each fret.

If you’d like, you can use excellent fret calculating tools like this one here:

HOWEVER, the height of the nut and bridge of your instrument can affect the precise exact location of your measured out frets. So when you’re doing it DIY it can be hard to get all the measurements right and precise and in tune.

I came up with a pretty simple way to figure out where your frets go, which is still pretty accurate:

So, if the video doesn’t explain it well enough:

  • String up your instrument, and tune it to whatever you decide you want your string to be.
  • Place whatever material you’re using for frets underneath the string and press the string behind it, check what note your tuner is saying it is.
  • If it’s too flat, move your fret higher up your neck. If it’s too sharp, move your fret further down your neck.
  • Mark where it’s exactly in pitch and move to your next note!
Do it slowly, and take your time and keep checking your original note is still in tune before committing to placing your fret down.