Dotted Eighth Delay: Times at Every Tempo, and Why It Works

The short answer: a dotted eighth delay repeats every three-quarters of a beat (one and a half eighth notes, or three sixteenths). At 120 BPM that's 375 ms; the formula is 60,000 ÷ BPM × 0.75. Because each echo lands between the beats rather than on them, the repeats fill the gaps in a groove instead of doubling it, which creates that rolling, cascading motion heard on countless guitar parts, synth leads, and vocal throws. For any tempo, the delay time calculator gives the exact value in one tap.

It's the delay setting I reach for first on leads and vocal throws in my own records (Sony, Universal, Ultra, Dim Mak), and the default selection in the calculator for exactly that reason.

Dotted eighth times at common tempos

If your delay plugin syncs to the host, just choose "1/8 D" or "1/8 dotted" and skip the numbers. The ms values are for plugins and hardware that can't sync, or when you want to nudge the time a few ms off the grid.

Why it sounds so good

Play straight eighths and a straight-eighth delay just repeats the rhythm you already have. A dotted eighth offsets every echo by a sixteenth, so each repeat falls into a gap the original didn't fill. Two notes turn into a moving pattern that sounds more complex than what was played. That's the trick behind the famous shimmering guitar sound of U2's The Edge, and it's why the same setting works on arpeggiated synths and sparse vocal lines. The calculator's echo timeline draws this: pick 1/8 dotted and watch the repeats land between the beat lines.

How to set it

On vocals: use it as a throw or at a low send level, on a return with the lows and highs filtered. Duck the return from the dry vocal so the echoes bloom in the gaps instead of blurring the words (how to sidechain a delay). The full vocal delay toolkit is in how to use delay on vocals.

On guitars and synths: feedback around 25 to 40% for a cascading pattern, mix around 20 to 35%. Ping-pong mode spreads the repeats left and right for width, but check it in mono.

On drums and busy parts: usually too much. A dotted eighth over a dense hi-hat pattern turns into clutter. Use a straight delay, a short slapback, or nothing.

Dotted, straight, or triplet?

• Dotted eighth: fills space, adds motion. Best on sparse parts.
• Straight eighth or quarter: reinforces the rhythm; clean and predictable.
• Triplet: swings against the grid; rolling and loose, great for hip-hop and half-time grooves.

When in doubt, try all three on the same part at matched level. The calculator shows every one side by side.

Quick answers

What is a dotted eighth delay in ms? 60,000 ÷ BPM × 0.75. At 120 BPM that's 375 ms; at 128 BPM, 351.56 ms; at 140 BPM, 321.43 ms.

Why is it called a dotted eighth? A dot adds half a note's value to itself, so a dotted eighth equals an eighth plus a sixteenth: three sixteenths, or three-quarters of a beat.

What is a dotted eighth delay used for? Creating rhythmic motion that fills the space between notes, especially on guitars, synth leads, and vocal throws.

Is dotted eighth the same as 3/16? Yes. Some plugins label it 3/16 instead of 1/8 D; the timing is identical.