Swing Ratio Calculator
Turn a swing percentage into the exact long and short note lengths, the long-to-short ratio and the off-beat delay for eighth- or sixteenth-note pairs. Use it to match a DAW's swing setting, program a groove grid, or check how far a written shuffle sits from straight and triplet time.
First four pairs
| Pair | Long at | Short at | Long beat | Short beat |
|---|
A swing amount of p percent places the second note of each pair at p% of the pair's span, so the first note sounds for p% and the second for 100 − p%. The ratio is p : (100 − p): 60% is 1.50 : 1, straight time is 1 : 1 at 50%, and the triplet feel 2 : 1 sits at 66.67%. The off-beat shift is the delay past the straight midpoint. Eighth-note pairs span one beat (60000 / BPM ms) and sixteenth-note pairs span half a beat. Ranges are 20–400 BPM and 50–75%; decimal commas are accepted. Timing is exact notation arithmetic, not a model of human micro-timing. Everything runs locally — nothing leaves your browser.