THE FEUTEX TOOLKIT

Capo Pitch and String Length Ratio

Calculate the equal-tempered pitch rise and vibrating length fraction at a capo fret.

Music workspace● Runs in your browser

01 Your input

FretfretsScalemmOpen hzHz

02 Your result

View or copy raw result data

Result data

Formula

Frequency = open_hz*Math.pow(2,fret/12); Length = scale/Math.pow(2,fret/12); Capo distance = scale-scale/Math.pow(2,fret/12)

Sources and model references

Made for real tasks

Calculate the equal-tempered pitch rise and vibrating length fraction at a capo fret.
Compare two scenarios by changing the inputs and rerunning the tool.

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

Enter fret, scale, open hz.
Use consistent units shown beside each input. Run the calculation and review the assumptions below.

{
  "fret": 5,
  "scale": 650,
  "open_hz": 110
}

Ideal equal temperament and no string stretching; does not identify chord shapes or instrument intonation.

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.