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THE FEUTEX TOOLKIT

Swing Eighth-Note Timing

Split a quarter-note beat into long and short eighth-note durations.

Music workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaLong ms = 60000/bpm*ratio/(1+ratio); Short ms = 60000/bpm/(1+ratio); Swing pct = 100*ratio/(1+ratio)

Made for real tasks

  • Split a quarter-note beat into long and short eighth-note durations.
  • Compare two scenarios by changing the inputs and rerunning the tool.
Explore step-by-step workflows →

Worked example

Inputs

Tempo (BPM)
120 quarter notes/min
Ratio
2 long/short

Expected results

Long ms
333.3333333 ms
Short ms
166.6666667 ms
Swing pct
66.66666667 %

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

How to use this tool

  1. Enter bpm, ratio.
  2. Use consistent units shown beside each input. Run the calculation and review the assumptions below.

Try this example

{
  "bpm": 120,
  "ratio": 2
}

Accuracy and scope

One quarter-note beat is divided into a long and short eighth in the entered ratio. Swing percentage means the long note’s share of the beat; no tempo-dependent human timing.

Is my data uploaded?

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.