Quarter Note
500 ms
BPM
120
Hz
2
Quarter Note Delay
500 ms
120 BPM
Quarter Hz
2 Hz
Dotted 8th
375 ms
| Note | Straight | Dotted | Triplet |
|---|---|---|---|
| Whole | 2000 ms | 3000 ms | 1333.3 ms |
| Half | 1000 ms | 1500 ms | 666.7 ms |
| Quarter | 500 ms | 750 ms | 333.3 ms |
| Eighth | 250 ms | 375 ms | 166.7 ms |
| Sixteenth | 125 ms | 187.5 ms | 83.3 ms |
| 32nd | 62.5 ms | 93.8 ms | 41.7 ms |
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Inputs
Result
Quarter = 60,000 / 120 = 500 ms. Half = 500 × 2 = 1,000 ms. Eighth = 500 / 2 = 250 ms. Dotted eighth = 250 × 1.5 = 375 ms. Triplet eighth = 250 × 2/3 = 166.7 ms. Sixteenth = 500 / 4 = 125 ms.
Inputs
Result
Quarter = 60,000 / 85 = 705.9 ms. Half = 705.9 × 2 = 1,411.8 ms. Eighth = 705.9 / 2 = 352.9 ms. Dotted eighth = 352.9 × 1.5 = 529.4 ms. Triplet eighth = 352.9 × 2/3 = 235.3 ms. Sixteenth = 705.9 / 4 = 176.5 ms.
Inputs
Result
Quarter = 60,000 / 150 = 400 ms. Half = 400 × 2 = 800 ms. Eighth = 400 / 2 = 200 ms. Dotted eighth = 200 × 1.5 = 300 ms. Triplet eighth = 200 × 2/3 = 133.3 ms. Sixteenth = 400 / 4 = 100 ms.
Quarter note delay (ms) = 60,000 / BPM. At 120 BPM: 60,000 / 120 = 500 ms. For other subdivisions: half note = 2×, eighth = ½×, sixteenth = ¼×. Dotted values = 1.5×, triplet values = 2/3×.
| BPM | Quarter (ms) | Eighth (ms) | Dotted 8th (ms) | Triplet 8th (ms) |
|---|---|---|---|---|
| 80 | 750.0 | 375.0 | 562.5 | 250.0 |
| 100 | 600.0 | 300.0 | 450.0 | 200.0 |
| 120 | 500.0 | 250.0 | 375.0 | 166.7 |
| 140 | 428.6 | 214.3 | 321.4 | 142.9 |
| 160 | 375.0 | 187.5 | 281.3 | 125.0 |
A dotted delay is 1.5× the straight value. A dotted eighth note at 120 BPM = 250 × 1.5 = 375 ms. Dotted delays create a rhythmic bounce (like U2’s "Where the Streets Have No Name") because they land between beats, adding movement.
| Note Value | Straight (ms) | Dotted (ms) | Character |
|---|---|---|---|
| Half | 1000 | 1500 | Slow, ambient wash |
| Quarter | 500 | 750 | Rhythmic echo |
| Eighth | 250 | 375 | Bouncing, most popular |
| Sixteenth | 125 | 187.5 | Fast, shimmery |
A triplet delay is 2/3 of the straight value, fitting three notes in the space of two. At 120 BPM a triplet quarter = 500 × 2/3 = 333.3 ms. Triplet delays create a waltz-like, swinging feel and work well for jazz and blues.
| Note Value | Straight (ms) | Triplet (ms) | Ratio |
|---|---|---|---|
| Half | 1000 | 666.7 | 2/3 |
| Quarter | 500 | 333.3 | 2/3 |
| Eighth | 250 | 166.7 | 2/3 |
| Sixteenth | 125 | 83.3 | 2/3 |
Set reverb pre-delay to a musical subdivision of your BPM. Common choices: 1/64 note or 1/32 note for natural feel. At 120 BPM: 1/64 = 31.25 ms, 1/32 = 62.5 ms. This keeps reverb tails rhythmically aligned with the track.
BPM = 60,000 / delay time (ms) for a quarter note. If your delay is 375 ms: BPM = 60,000 / 375 = 160 BPM. For eighth notes, multiply result by 2. For dotted eighths, divide by 1.5 then multiply by 2.
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Last Updated: Mar 25, 2026
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