Delay Time Calculator
Calculates the exact delay time in milliseconds that syncs an echo effect to a given tempo and note value. Used by guitarists, producers, and sound designers to set tempo-locked delays.
Last updated: May 2026
Compare with similar
About this calculator
A tempo-synced delay repeats incoming audio at intervals that align precisely with the musical beat, turning raw echoes into rhythmic enhancements rather than random slap-back. The formula is delay_ms = (60000 / BPM) × noteValue. Conceptually, 60000 milliseconds per minute divided by BPM gives the length of one quarter note in milliseconds; multiplying by a note-value coefficient scales that to the desired subdivision. Standard coefficients: 1 = quarter note, 0.5 = eighth note, 0.25 = sixteenth note, 2 = half note, 4 = whole note. Dotted variants multiply by 1.5 (dotted eighth = 0.75); triplets multiply by 2/3 (eighth triplet = 0.5 × 2/3 = 0.333). At 120 BPM: quarter = 500 ms, eighth = 250 ms, dotted eighth = 375 ms. Edge cases: very slow tempos (under 30 BPM) produce delays over 2000 ms that exceed many delay-plugin buffer limits; very fast tempos with sixteenth-note settings produce delays under 30 ms, which begin to overlap incoming notes and create comb-filtering artifacts rather than discrete echoes; tempo automation requires re-syncing the delay or using a tempo-aware plugin.
How to use
Example 1: Mix a guitar track at 90 BPM and apply a dotted-eighth delay (noteValue = 0.75) — the classic Edge / U2 rhythmic delay sound. Step 1: 60000 / 90 = 666.67 ms per quarter note. Step 2: 666.67 × 0.75 = 500 ms. Set your delay pedal or plugin to 500 ms. Verify: at 90 BPM each eighth note lasts 333.3 ms, and dotted eighth = 333.3 × 1.5 = 500 ms — matches. Example 2: Sync a vocal slap-back at 120 BPM to a sixteenth note (noteValue = 0.25). Step 1: 60000 / 120 = 500 ms per quarter. Step 2: 500 × 0.25 = 125 ms. Verify: at 120 BPM a sixteenth lasts (60/120)/4 = 0.125 s = 125 ms — matches. Set the delay's time control to 125 ms (or use tempo-sync mode set to 1/16).
Frequently asked questions
How do I choose the right note value for a tempo-synced delay?
The note value sets the rhythmic feel of the echoes. Quarter note (1.0) gives bold, on-the-beat repeats that reinforce the groove. Eighth note (0.5) produces busier, faster repeats common in pop and electronic music. Dotted eighth (0.75) is the iconic U2/Edge syncopated rolling delay that fills holes between strums. Sixteenth (0.25) creates a tight machine-gun stutter useful for solos and accents. Triplet variants (2/3 × straight value) inject a swing or shuffle feel. Start with dotted eighth or quarter for most musical contexts, then experiment with shorter values for rhythmic special effects.
Why is delay time measured in milliseconds rather than beats?
Delay hardware and many older plugins accept time in milliseconds because they predate the tempo-sync convention that modern DAWs popularized. Milliseconds give precise, tempo-independent control useful when recording without a click track or when matching a vintage analog delay setting. Converting BPM to milliseconds lets you dial in the exact value even on rack units and stompboxes that lack MIDI sync. Modern DAW plugins typically offer both ms and note-value modes, but knowing the ms equivalent lets you match a sound across any device regardless of feature set. Mastering engineers also use ms when checking inter-channel timing in stereo widening tools.
What happens to the sound if the delay time is not synced to the song's BPM?
Unsynced delays place echoes off the rhythmic grid, producing a washed-out or cluttered sound as repeats collide with incoming notes. At slow tempos with long delay times, the effect blurs into pseudo-reverb rather than discrete echoes. At fast tempos with the wrong delay time, repeats pile up and turn the mix muddy. Unsynced delays do have valid uses — ambient pads, experimental textures, and dub effects all benefit from slightly detuned timing. Bouncing a previously synced delay through a tape-style emulation introduces small intentional timing variations that lend a warmer, more human feel.
What are common mistakes when setting tempo-synced delay times?
Entering noteValue = 0.25 thinking it means 'quarter note' when 0.25 is actually a sixteenth note is a frequent confusion — quarter note = 1.0 in this formula. Mixing whether your BPM counts quarters or eighths (especially in 6/8 or 12/8 pieces) doubles or halves every result. Forgetting that dotted = 1.5× and triplet = 2/3× means hand-set ms values miss the intended rhythmic feel. Forgetting to re-sync after a tempo automation leaves echoes drifting off the beat in the new section. Finally, some delay plugins use bars-per-cycle rather than note-value, so settings copied directly between plugins can be off by a factor of 4.
When should I NOT use this calculator?
Ambient and atmospheric productions often want intentionally off-grid delays to create a sense of timelessness rather than a tight rhythmic pocket. Slap-back effects on vintage rockabilly and 1950s vocals are deliberately set at fixed ms values (typically 80–120 ms) regardless of tempo, because they evoke a specific tape-echo aesthetic. Modulated and pitch-shifted delays — chorus, flanger, and shimmer effects — work in regions where tempo sync is musically irrelevant. Multi-tap and ping-pong delays with several feedback paths often sound better when each tap is set independently rather than locked to one note value. Live performance with tempo changes between songs needs to re-sync, so consider using a tempo-aware plugin instead of a fixed-ms value.