Audio Delay Time Calculator
Calculates delay times in milliseconds that sync perfectly to a song's tempo, for any note division from whole notes to 32nd notes. Used by guitarists, producers, and mix engineers to set tempo-locked echo effects.
About this calculator
Tempo-synced delay times are derived from the duration of a musical beat. Since one minute contains 60,000 milliseconds, a single quarter-note beat lasts 60,000 / BPM milliseconds. The full formula is: delayTime (ms) = (60,000 / BPM) × noteValue, where noteValue is a multiplier representing the desired rhythmic subdivision — for example, 1 for a quarter note, 0.5 for an eighth note, 0.25 for a sixteenth note, or 2 for a half note. Feedback percentage controls how many repeats are heard before the echo fades to silence. Wet/dry mix sets the balance between the effected signal and the unprocessed original. Matching delay time to tempo makes rhythmic echoes feel intentional and musical rather than cluttered.
How to use
Suppose you are mixing a track at 120 BPM and want an eighth-note delay (noteValue = 0.5). Calculation: delayTime = (60,000 / 120) × 0.5 = 500 × 0.5 = 250 ms. Set your delay pedal or plugin to 250 ms. For a dotted eighth note (noteValue = 0.75), the result would be 375 ms — the classic U2-style slapback delay. At 60% feedback and 30% wet mix, each repeat decays smoothly without overwhelming the dry signal. Always verify by ear that the echoes fall on the beat.
Frequently asked questions
How do I calculate a dotted note delay time from BPM for music production?
A dotted note is 1.5 times the duration of its base note. To get a dotted quarter note delay at 120 BPM, multiply the quarter-note delay by 1.5: (60,000 / 120) × 1.5 = 750 ms. For a dotted eighth note, use a noteValue of 0.75: (60,000 / 120) × 0.75 = 375 ms. This timing is extremely common in pop and rock production because it creates a rhythmic triplet feel that sits naturally between the beats. Enter 0.75 in the Note Division field to have the calculator compute it automatically.
What feedback percentage should I use for natural-sounding echo in a delay effect?
Feedback controls how many times the delayed signal repeats before fading away. Low feedback (10–30%) produces a single subtle slap-back echo, typical in rockabilly and country guitar tones. Medium feedback (40–60%) creates several audible repeats that trail off naturally, useful for melodic lead lines. High feedback above 70% causes long cascading repeats that can build into self-oscillation if pushed to 100%. For most mixing contexts, 30–50% feedback keeps echoes musical without cluttering the mix.
Why is it important to sync delay time to BPM when mixing a song?
When delay time is synchronized to the song's tempo, each echo repeat lands precisely on a rhythmic subdivision, reinforcing the groove rather than fighting it. Unsynchronized delays introduce timing conflicts that make busy mixes sound muddy and unfocused. Tempo-synced delays are especially critical for eighth-note and sixteenth-note subdivisions in electronic and pop music where the rhythmic grid is strict. Even in looser genres, a tempo-locked delay helps the effect feel composed rather than accidental.