BPM to Delay Calculator

Tempo-synced delay repeats land on the beat instead of drifting against it. The core formula starts with one quarter note at your BPM: delay in milliseconds = (60,000 ÷ BPM) × note value. Sixty thousand is the number of milliseconds in one minute; dividing by beats per minute gives the length of one quarter note. Multiply that base by the note fraction you choose — eighth notes use 0.5, dotted quarters use 1.5, and so on — to get the delay time your plugin or hardware unit needs.

Most DAWs label BPM as quarter-note beats per minute in 4/4 time, which is what this calculator assumes. If you work in half-time feel at 120 BPM, the quarter-note delay still matches the click — but a dotted-eighth delay is the classic “U2 / Edge” dotted rhythm at many tempos. Triplet values divide the beat into three equal slices instead of two, which is useful when your groove uses triplet hi-hats or swing subdivisions.

Hardware delay pedals and Eurorack modules usually accept milliseconds directly. Software delay plugins may offer note sync when the session tempo is linked, but outboard gear and send/return paths often need you to type ms by hand. Use this tool when auditioning slapback echo on vocals, widening synths with a short stereo delay, or dialing a ping-pong repeat that stays locked after you change BPM mid-session.

Worked example with the default fields: 120 BPM and a quarter note (note value 1). One beat lasts 60,000 ÷ 120 = 500 ms, so the headline shows 500 ms delay. That equals 0.5 seconds per repeat, and the rate row shows 2 Hz — two repeats per second. Switch to an eighth note (0.5) at the same tempo and the delay halves to 250 ms, which feels tighter on arpeggiated synths. A dotted quarter (1.5) at 120 BPM gives 750 ms — a common rockabilly slapback spacing.

Changing tempo scales delay time inversely. At 90 BPM a quarter note is 667 ms; at 140 BPM it drops to about 429 ms. If you know the ms that sounded good at 120 BPM and move to 90 BPM, multiply by the ratio of old BPM to new BPM (500 × 120 ÷ 90 ≈ 667) rather than guessing. This calculator does that math instantly when you update the BPM field.

Common mistakes include entering BPM from a half-time display while thinking in full-time subdivisions, confusing delay time with pre-delay on reverbs, and forgetting that some plugins round ms to the nearest integer. Another pitfall is using triplet delay on straight eighth-note material — the repeats will sit between the grid. Always A/B against a metronome when setting critical echo on busses.

Note-value presets in the dropdown map to the multiplier in the formula — they are not separate BPM readings. Dotted values are 1.5× the straight note; triplet quarter uses 2/3 of a beat (0.667). If your plugin only offers “1/4, 1/8, dotted 1/8,” pick the matching option here and paste the ms result.

Limits: this is beat-subdivision math only. It does not model analog tape wow, feedback filtering, or ping-pong pan laws. Odd time signatures and polymeters may need manual adjustment if your DAW treats the beat unit differently. Swing and groove templates shift perceived timing — use your ears after setting the calculated ms.