Fret Calculator

Category: Music
- April 25, 2025
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Calculate fret positions for stringed instruments. This calculator determines the exact spacing of frets based on scale length, fret count, and compensation factors to ensure proper intonation.

Instrument Type

Scale Length

Fret Configuration

Intonation Compensation

Advanced Options

About Fret Calculations

Proper fret placement is crucial for the intonation of stringed instruments. The calculations are based on the mathematical principle of equal temperament, which divides an octave into 12 equal semitones.

Scale Length

The scale length is the vibrating length of a string, measured from the nut to the bridge. It's a fundamental parameter that affects the tone, playability, and feel of the instrument.

  • Common Guitar Scale Lengths: 24.75" (Gibson), 25.5" (Fender)
  • Common Bass Scale Lengths: 30", 32", 34", 35"
Intonation Compensation

In practice, perfect mathematical fret placement may require slight adjustments due to:

  • String Deflection: The height of the strings above the fretboard
  • String Tension: The stiffness and elasticity of the strings
  • String Gauge: Thicker strings may require more compensation
Multi-scale (Fan Fret) Designs

Multi-scale or fan fret instruments use different scale lengths for different strings:

  • Benefits: Improved string tension balance, enhanced ergonomics, clearer bass response
  • Perpendicular Fret: The fret where all scales align at right angles to the centerline

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