Delay Time Calculator
— BPM to Milliseconds

What Is Delay Time and Why Calculate It?

Delay time is the gap between the original sound and its echo. In music production, when a delay effect produces an echo at a time that matches a fraction of the song's beat, the echo locks rhythmically with the music. This creates a clean, musical effect that enhances the groove. When the delay time does not match the BPM, the echo lands at random positions between beats, producing a muddy, cluttered sound that feels disconnected from the music.

The relationship is mathematical. A song at 120 BPM has 120 beats per minute, which means 60 seconds ÷ 120 beats = 0.5 seconds per beat. That's 500 milliseconds per quarter note. If you set a delay pedal to exactly 500ms at 120 BPM, every echo lands precisely on the next beat. If you set it to 250ms, every echo lands on the offbeat (the "and" between beats). If you set it to 375ms, every echo lands on the "and-a" — creating the famous dotted eighth pattern.

The calculator above does this maths instantly. Enter any BPM and it shows the corresponding delay time for every note value — whole notes, halves, quarters, eighths, sixteenths, thirty-seconds, plus dotted variants and triplets. The Hz value below each delay time tells you the corresponding frequency, which is essential when syncing LFOs in synthesisers to song tempo.

The Core Formula

The base formula for converting BPM to milliseconds is:

Quarter note delay (ms) = 60,000 ÷ BPM

Once you have the quarter note delay, all other note values are derived from it:

• Whole note = quarter × 4
• Half note = quarter × 2
• Quarter note = base value
• Eighth note = quarter ÷ 2
• Sixteenth note = quarter ÷ 4
• Thirty-second note = quarter ÷ 8

For dotted notes, multiply the base note value by 1.5 (or 0.75 for going down). For triplets, multiply by 2/3 (or 0.667). The calculator above handles all of this automatically — switch between Straight, Dotted, and Triplet tabs to see all variations at your chosen BPM.

Delay Pedals for Guitarists

Guitar players use delay pedals more than any other group of musicians. Time-based effects — delay, reverb, tremolo — sound musical only when their timing relates mathematically to the song's BPM. A delay set to a random millisecond value produces noise; a delay set to a quarter, eighth, or dotted eighth note produces a rhythmic, musical effect that enhances the song.

The Quarter Note Delay

The quarter note delay is the most commonly used setting in rock, pop, and country guitar. Each echo lands exactly one beat after the original note. At 120 BPM the delay is 500ms; at 100 BPM it is 600ms; at 140 BPM it is 429ms. Use a quarter note delay for slow ballads, epic rock builds, and country guitar fills. Famous examples include the slow guitar leads on Pink Floyd's "Comfortably Numb" and many Eric Clapton solos.

The Dotted Eighth Note Delay

The dotted eighth note delay is the signature setting that defined U2's guitar sound in the 1980s and remains the most distinctive delay setting in modern guitar. The Edge built nearly an entire career around this single delay value. The dotted eighth is exactly 75% of the quarter note value — at 120 BPM, the quarter is 500ms and the dotted eighth is 375ms.

The musical effect is striking. When you play a single note at the start of the bar, the dotted eighth delay produces an echo that lands in the gap between beats — specifically on the "and-a" of beat 1. This creates the impression of a much faster, more complex passage from a single melodic line. Famous tracks built around dotted eighth delay include U2's "Where the Streets Have No Name", "With or Without You", and "Sunday Bloody Sunday", as well as much of David Gilmour's solo work and Andy Summers' guitar parts in The Police.

To set a dotted eighth delay: tap the song's BPM into the calculator above, switch to the Dotted Notes tab, read the value next to "Dotted 8th", and dial that millisecond number into your delay pedal's time control.

The Triplet Eighth Note Delay

Triplet delays are common in shuffle and swing-based blues, jazz, and country. A triplet eighth at 120 BPM is 167ms — three echoes per beat instead of two. This setting works particularly well over a 12/8 blues groove or any song with shuffle feel, because the delay echoes match the existing triplet feel of the song. Stevie Ray Vaughan, BB King, and Buddy Guy all used triplet delays in their slower blues passages.

Slapback Delay

Slapback is a very short delay (40–120ms) that produces a single, near-instantaneous echo. It does not relate to BPM directly — slapback is more about creating the illusion of a "doubled" guitar than locking to song tempo. This was the defining guitar sound of 1950s rockabilly: Elvis Presley's Sun Records sessions, Carl Perkins, Scotty Moore. Modern country and Americana still use slapback heavily. The 40–120ms range falls between a thirty-second note and a sixteenth note at most BPMs, so technically it is rhythmic, but it is short enough that the rhythmic relationship is below the threshold of perception.

Delay Calculation for Music Producers

Music producers use delay calculations across many contexts beyond just guitar effects. In a modern DAW production session, delay times affect drums, vocals, synth pads, lead lines, and mix-bus effects. Knowing the precise delay times for any tempo is essential for clean, locked production.

Vocal Delay Throws

A vocal "throw" is a delay applied to a single word or phrase to create a thrown-back echo effect. Producers use eighth note or dotted eighth note delays on the last word of a line to add space and movement. The vocal sits in the centre of the mix; the echo lands a beat later, slightly to one side via panning. Famous examples include the iconic vocal throws on early Britney Spears records, modern Drake productions, and Ariana Grande tracks.

Drum Bus Delay

A short sixteenth or thirty-second note delay on the drum bus, mixed at low level (5–15% wet), adds depth and energy to drums without sounding obviously echoed. This is a standard technique in pop, EDM, and hip-hop production. The delay must be precisely synced to the BPM or it muddies the kick and snare attack.

Sidechained Delay

A delay sidechained to the kick drum produces echoes that duck out of the way when the kick hits, then fade up between kicks. This is a common technique in modern house and EDM production for vocal lines, synth leads, and stab samples. The delay time must match a note value of the BPM to avoid clashing with the next kick.

Tempo-Synced LFOs

A Low Frequency Oscillator (LFO) modulates a parameter — typically filter cutoff, volume, or panning — at a rhythmic rate. When the LFO rate is synced to BPM, the modulation locks to the music. The Hz value displayed below each note value in the calculator above is the LFO frequency that matches that note division. For example, at 120 BPM, an LFO running at 2 Hz produces one full cycle per quarter note. At 4 Hz, one cycle per eighth note. At 8 Hz, one cycle per sixteenth note.

Reverb Pre-Delay Calculation

Reverb pre-delay is the small gap between the original sound and the start of the reverb tail. This pre-delay simulates the distance between the sound source and the surrounding walls — a singer five metres from the wall hears their reflection 30ms after singing, while a singer in a cathedral hears reflections starting 80–150ms later.

For musical productions, syncing the pre-delay to BPM produces cleaner mixes. A common technique is to set the pre-delay to a thirty-second or sixty-fourth note of the BPM. At 120 BPM, a thirty-second note is 62.5ms — a perfect pre-delay value for a medium room reverb. The reverb tail then starts on a rhythmically correct subdivision, integrating cleanly with the rest of the mix instead of smearing across beats.

Recommended Pre-Delay by Genre

• Pop and EDM: 20–40ms (sixty-fourth to thirty-second note at typical BPMs)
• Rock: 30–60ms (thirty-second to sixteenth note)
• Hip-hop: 40–80ms (varies with BPM)
• Ballads and orchestral: 80–150ms (gives a natural concert-hall sound)
• Ambient and shoegaze: 100–250ms (very long pre-delay produces dreamy textures)

Use the calculator above to find the exact thirty-second or sixty-fourth note value at your project BPM, then set your reverb pre-delay to match. The result is a reverb that feels integrated with the music rather than washing over it.

Quick Reference — Common BPM Delay Times

This table shows quarter, dotted eighth, and eighth note delay times for common BPM values used in popular music genres.

Setting Up Tap Tempo on Popular Delay Pedals

Most modern delay pedals have built-in tap tempo input via a foot switch — you tap the song's BPM with your foot during a count-in, and the pedal calculates the delay time automatically. For pedals without tap tempo input, use the calculator above to find the millisecond value, then dial it in manually.

Boss DD-200, DD-500, DD-8

Boss delay pedals have a dedicated TAP footswitch. Tap 4–5 times in time with the song. The pedal sets the quarter note delay to match. For dotted eighth, hold the TAP switch down and select the note value from the menu. The DD-500 and DD-8 also accept external footswitches for tap tempo if the onboard switch is dedicated to bypass.

Strymon Timeline, El Capistan, Brigadier

Strymon pedals have a TAP footswitch on every model. Tap 4–8 times to set the quarter note. Use the SUBDIV knob to switch between quarter, eighth, dotted eighth, and triplet subdivisions while keeping the same tapped tempo. The Strymon Timeline saves separate tempo per preset, allowing different songs in a setlist to recall their own delay times.

Eventide TimeFactor, H9

Eventide pedals have a Tap footswitch and a separate "Tempo" parameter that can be set in BPM directly or by tapping. The H9 also accepts a MIDI clock signal from a DAW or external sequencer for sample-accurate sync.

MXR Carbon Copy, Way Huge Aqua-Puss

Older analogue-style delays often do not have tap tempo. For these, use the calculator above to find the millisecond value, then dial in the time knob by ear or with a tuner-style stopwatch app. Most analogue delays have a max delay time of 600–1000ms, which limits them to faster tempos at quarter note delay.

Universal Audio UAD Plugins, FabFilter Timeless, Soundtoys EchoBoy

DAW plugins almost universally support tempo sync — the host DAW provides the BPM automatically. Switch the plugin to Sync mode and choose a note value. The calculator above is most useful for plugins that do not support sync, or for verifying that a synced plugin is producing the correct delay time.

Common Delay Calculation Mistakes

Mistake 1 — Mixing up dotted and triplet. Dotted notes are 1.5x the base value (longer). Triplets are 2/3 the base value (shorter). Dotted eighth at 120 BPM is 375ms; triplet eighth at 120 BPM is 167ms. They are not interchangeable.

Mistake 2 — Using milliseconds when the pedal expects seconds. Older Echoplex-style and some boutique delays display time in seconds (0.5s) rather than milliseconds (500ms). Convert by dividing the calculator value by 1000.

Mistake 3 — Confusing tempo with metronome BPM. If a song is in cut time (alla breve), the printed BPM may be in half-note pulses rather than quarter-note pulses. Verify what one beat represents before calculating delay.

Mistake 4 — Not accounting for half-time/double-time tracks. A drum and bass track at 174 BPM and a hip-hop track at 87 BPM (half-time) require different delay calculations even though they may sound similar in pulse. Use the actual project BPM, not the perceived pulse.

Mistake 5 — Ignoring pre-delay when sync is off. Some delay pedals have a small built-in offset between the foot tap and the actual echo. If echoes feel slightly off the beat, check whether the pedal has a "tempo offset" or "input delay" parameter and adjust by 5–20ms to compensate.

BPM to Hz Conversion (For Synth LFOs)

The Hz value displayed below each delay time in the calculator above is the corresponding frequency. This is essential for synth players who want to sync an LFO to the song's tempo.

The formula: Hz = 1000 ÷ delay time in milliseconds. So at 120 BPM with a quarter note delay of 500ms, the matching LFO frequency is 1000 ÷ 500 = 2 Hz. An LFO running at 2 Hz completes one full cycle per quarter note. At 4 Hz it completes one cycle per eighth note. At 8 Hz, one cycle per sixteenth note.

For analogue synthesisers without tempo sync — Moog Sub 37, Korg Minilogue without DAW connection, vintage gear — calculating the Hz value lets you set the LFO rate manually so that filter sweeps, vibrato, or panning effects lock to the song. Most modern digital synths have direct tempo sync mode that handles this automatically.

Frequently Asked Questions