Home› Daily Life› Hobbies› Music BPM Calculator

Music BPM Calculator

Delay times, tap tempo, swing, polyrhythm, LFO rates & concert pitch — the complete studio toolkit.

⚡ Tempo Controls
-- BPM 0 taps
Allegro
🎶 Swing & Groove
50%
+0ms 1:1
⏱ Delay Times
Quarter Note 500ms
8th Note 250ms
Bar Duration 2,000ms
Hz / Beat 2.00 Hz
Samples / Beat 22,050
Tempo Class Allegro
Note ms Samples Hz
⚡ Haas Zone
Reverb Pre-Delay (click to copy)
Quarter 60,000 ÷ 120 = 500ms
Dotted 500 × 1.5 = 750ms
Triplet 500 × 0.667 = 333ms
🌊 Delay Visualizer
Time --
Samples --
Hz --

Delay Time Spectrum

Note subdivisions at current BPM — visualizes how delay times scale across the rhythmic grid

♬ Polyrhythm
:
X interval 666.7ms
Y interval 500.0ms
LCM cycle 2,000ms
🎶 Reverb Pre-Delay

Short delays before reverb preserve transient clarity. Click any chip to copy.

🔄 Looper Capacity
seconds
Bars 15
+ Beats 0
Exact 0:30.000
~ LFO Rate Reference

Tempo-synced LFO rates in Hz. Click to copy.

🎬 Arrangement Calculator
= 105 Bars
bars = 1:04
🎵 Tempo Markings

Current BPM row is highlighted in gold.

MarkingBPMCharacterGenres
Larghissimo20–40Extremely slowAmbient, drone
Largo40–60Very slow, broadClassical, film scores
Larghetto60–66Rather broadOrchestral, cinematic
Adagio66–76Slow, expressiveBallads, ambient
Andante76–108Walking paceHip-hop, R&B, lo-fi
Moderato108–120Moderate energyPop, reggae, soul
Allegro120–156Fast, livelyRock, EDM, house
Vivace156–176Very fast, brightTechno, trance
Presto176–200Extremely fastDrum & bass
Prestissimo200+As fast as possibleSpeedcore, extratone
♬ Concert Pitch Reference (A4 = 440 Hz)
✖ Musical Math

Common tempo relationships derived from current BPM.

How to Use This Calculator

1

Set Your Tempo

Enter a BPM value manually, use the +/- buttons, tap the Tap Tempo button in rhythm, or select a preset chip for common genre tempos.

2

Read Delay Times

View the complete delay table with straight, dotted, and triplet values in milliseconds, samples, and Hz. Click any cell to copy the value.

3

Explore Studio Tools

Use the Studio Tools tab for swing/groove, polyrhythm visualization, LFO sync rates, looper timing, arrangement calculator, and concert pitch reference.

Key Formulas

BPM to Milliseconds

Delay (ms) = 60,000 / BPM x note ratio

Quarter note ratio = 1, half = 2, eighth = 0.5. Dotted = x1.5, triplet = x2/3.

Tap Tempo

BPM = 60,000 / avg. tap interval (ms)

Averages the last 8 tap intervals. Auto-resets after a 3-second gap between taps.

Concert Pitch

f(n) = 440 x 2^((n-49)/12)

Maps piano key number n to frequency. A4 = key 49 = 440 Hz. Each octave doubles the frequency.

LFO Sync Rate

Rate (Hz) = 1000 / delay (ms)

Converts delay time to frequency. At 120 BPM, a quarter note = 500ms = 2.00 Hz.

Key Terms

BPM (Beats Per Minute)

The standard measure of musical tempo. One beat is typically a quarter note. Common ranges: 60 BPM (ballad) to 180 BPM (drum and bass).

Haas Effect

When delay is below ~35ms, the brain fuses it with the original signal and perceives spatial widening rather than a distinct echo.

Swing / Groove

Timing offset applied to off-beat notes, pushing them later for a human, laid-back feel. MPC swing of 54-67% is central to hip-hop.

Polyrhythm

Two simultaneous rhythmic cycles in different meters. A 3:4 polyrhythm plays 3 notes against 4 in the same time span.

LFO

Low-Frequency Oscillator that modulates parameters (filter, pitch, volume) at sub-audio rates. Syncing to tempo creates musical effects.

Pre-Delay

Short delay before reverb onset that preserves the transient attack. Typically 1/32 or 1/64 note value for clarity.

Worked Examples

Setting a Dotted-Eighth Delay at 128 BPM

Quarter = 60,000 / 128 = 468.75ms. Dotted-eighth = 468.75 x 0.5 x 1.5 = 351.6ms. This creates the classic U2-style ping-pong echo.

LFO Sync: 2-Bar Sweep at 120 BPM

Quarter = 500ms. Bar = 2,000ms. 2 bars = 4,000ms. LFO rate = 1000/4000 = 0.250 Hz for a tempo-locked filter sweep.

Reverb Pre-Delay at 100 BPM

Quarter = 600ms. 1/32 note = 600 x 0.125 = 75ms. This keeps the snare transient dry while the reverb tail breathes behind it.

Formulas & Methodology

BPM from Tap Tempo

BPM = 60,000 ÷ avg. interval (ms)

Counts tap timestamps, averages the intervals between the last 8 taps, and divides 60,000 by that average. Auto-resets after a 3-second gap.

Delay Time

Delay (ms) = 60,000 ÷ BPM × note ratio

Quarter note = ratio 1. Half note = 2. 1/8 = 0.5. Dotted values multiply by 1.5; triplet values multiply by 2/3.

Concert Pitch

f(n) = 440 × 2(n−49)/12

Maps piano key number n (A4 = key 49) to frequency. Each octave doubles the frequency. A3 = 220 Hz, A5 = 880 Hz.

About this calculation · Accuracy & Methodology

Key Terms

BPM (Beats Per Minute)
The standard measure of musical tempo. One beat is typically a quarter note. Common ranges span from 60 BPM (ballad) to 180 BPM (drum and bass).
Haas Effect
When a delay is set below approximately 35ms, the brain fuses it with the original signal and perceives spatial widening rather than a distinct echo — a powerful mixing technique.
Swing / Groove
A timing offset applied to off-beat notes, pushing them later to create a human, laid-back feel. MPC swing of 54–67% is central to hip-hop and electronic music production.
Polyrhythm
Two simultaneous rhythmic cycles in different meters. A 3:4 polyrhythm plays 3 evenly-spaced notes against 4 in the same time span, creating a cross-rhythmic tension.
LFO (Low-Frequency Oscillator)
A modulator that cyclically varies a parameter (filter cutoff, pitch, volume) at sub-audio rates. Syncing the LFO rate to tempo creates musical modulation effects.

Worked Examples

Example 1: Setting a Delay Plugin

Scenario: Your project is 128 BPM and you want a dotted-eighth slapback.

Quarter = 60,000 ÷ 128 = 468.75ms. Dotted-eighth = 468.75 × 0.5 × 1.5 = 351.6ms.

Result: Set your delay to 351.6ms for the classic U2-style echo locked to the grid.

Example 2: Syncing an LFO

Scenario: You want a filter sweep that completes one cycle every 2 bars at 120 BPM.

Quarter = 500ms. Bar = 2,000ms. 2 Bars = 4,000ms = 0.250 Hz.

Result: Set your LFO rate to 0.250 Hz for a tempo-locked two-bar sweep.

Example 3: Reverb Pre-Delay

Scenario: You need a pre-delay for a 100 BPM snare to preserve its attack.

Quarter = 600ms. 1/32 note = 600 × 0.125 = 75ms pre-delay.

Result: 75ms keeps the transient dry while the reverb tail breathes behind it.

The Complete Guide to Tempo-Synced Music Production

Tempo is the heartbeat of every piece of music. Measured in beats per minute, it determines whether a song feels languid or urgent, meditative or frenetic. Even a change of five BPM can alter the emotional impact of a track. For producers, knowing the exact tempo is not just an artistic choice but a technical necessity, because time-based effects such as delays, reverbs, and modulation must be synchronized to the beat grid to sound musical rather than chaotic.

Why Synced Delay Times Matter

When a delay unit is set to a value that does not divide evenly into the song's bar length, the echoes drift off the rhythmic grid. At best, this creates a washy ambience; at worst, it muddies the mix and fights the groove. Converting BPM to exact milliseconds ensures that each echo lands on a musically meaningful subdivision. Quarter-note delays reinforce the pulse, eighth-note delays create a driving slapback, and dotted-eighth delays produce the iconic ping-pong rhythm heard across pop and ambient genres.

Samples, Hz, and the Digital Studio

Modern digital audio workstations operate at sample rates of 44.1 kHz, 48 kHz, or higher. Some hardware processors and low-level DSP routines require delay values in samples rather than milliseconds. Converting between the two is straightforward: multiply the delay in seconds by the sample rate. Similarly, LFO modulation rates are expressed in Hz — knowing that a quarter-note at 120 BPM equals 2.00 Hz allows producers to dial in tempo-synced filter sweeps with precision.

Swing, Groove, and Human Feel

Perfectly quantized music can sound sterile. Swing introduces a deliberate timing offset to off-beat notes, pushing them slightly later to create a human, laid-back feel. The MPC drum machine popularized a 54 to 67 percent swing ratio that remains central to hip-hop and electronic music. By calculating the exact millisecond offset, producers can match delay times and sidechain envelopes to their rhythmic template.

Concert Pitch and Tuning Reference

Every musical note corresponds to a precise frequency. A4 = 440 Hz is the international standard concert pitch. From this anchor, all other notes derive by the formula f = 440 × 2^((n-49)/12), where n is the piano key number. This is particularly useful when tuning synthesizer oscillators, verifying bass frequencies for mastering headroom, and designing tuned percussion loops.

Frequently Asked Questions

How do I convert BPM to milliseconds?

Divide 60,000 by the BPM value. At 120 BPM, a quarter note = 60,000 ÷ 120 = 500ms. For shorter notes, multiply by their fraction: an eighth note = 500 × 0.5 = 250ms.

What is the Haas effect and when should I use it?

The Haas effect occurs when a delay is set below ~35ms. The brain fuses the delayed copy with the original and perceives it as wider stereo rather than a distinct echo. Use it to widen mono elements (guitars, pads) without panning them.

What swing percentage should I use?

50% = perfectly straight (no swing). MPC-style hip-hop uses 54–60%. Hard jazz swing is around 67% (triplet feel). Start at 54% for subtle groove and increase until the pocket feels right.

Why does my delay sound off-grid?

If a delay value doesn't divide evenly into the bar length, echoes drift off the rhythmic grid. Always use tempo-synced values from the delay table. Pay attention to dotted vs. straight values — a dotted eighth is not the same as a triplet quarter.

What sample rate should I use?

44.1 kHz is standard for music releases (CD quality). 48 kHz is standard for video/broadcast. 88.2 and 96 kHz are used for high-resolution production. The sample count column in the delay table changes accordingly.

How does the polyrhythm calculator work?

Enter two numbers X:Y. The calculator divides one bar into X equal parts and Y equal parts, showing the ms interval for each. The LCM (Least Common Multiple) shows when both rhythms align again. The visual grid marks every beat of both rhythms across the bar.