Scale Length Selector Program · Matching Your Hand Size to the Right Scale Length

This page offers the Kepma Guitars scale length selector program. It measures your hand so you can work out which scale length actually suits you, avoiding the two classic problems: a guitar too big to fret, or too small to play freely.

Why scale length should match your hand

Scale length is the vibrating length of a string, measured from the nut to the bridge saddle. Common sizes run from 600 mm to 650 mm. A longer scale means wider spacing between frets and higher string tension, which usually gives a fuller tone with more low end. A shorter scale means a more compact fret layout and less pressure needed to fret, which is friendlier to small hands and to beginners. Landing on a scale length that matches your hand measurably reduces the effort of fretting and makes a correct hand position far easier to hold.

What needs to be measured

The core measurement is the straight-line distance in millimetres from the tip of your thumb to the tip of your little finger, entered by hand. Spread all five fingers as far as they will go and measure thumb tip to little-finger tip with a ruler. If you would rather not measure by hand, the photo recognition feature can read your hand size for you automatically.

How to take a photo the program can read

Hold your palm square to the camera and let it fill as much of the frame as possible. Spread all five fingers fully. Keep the background a single flat colour that contrasts clearly with your skin tone, so the outline can be segmented accurately. You can take a photo, pick one from your library, or open the camera directly. The recognition model has to load first, so give it a few seconds on first use. If the result is poor, you can recognise again, annotate by hand, or clear the data and start over.

How to choose within the range

The program returns a recommended range of scale lengths matched to your hand size. If you care about both tone and feel, pick inside that range according to your playing style: lean toward the longer end for strumming and singing if you value low-end weight; lean toward the shorter end for fingerstyle, frequent complex chords, or smaller hands. Hand measurements are processed on your own device and are never uploaded.

Buying advice

Scale length is only one dimension of choosing a guitar. When shopping, also pay attention to nut width, neck depth, string action and body shape, because all of them affect the feel just as directly. If you can, play a few instruments in a shop and compare the same chords and phrases on each: the difference in feel is obvious straight away.