Metronome Subdivision Calculator
Calculate the precise pulse rate of any rhythmic subdivision or polyrhythm at a given tempo in BPM. Use it when programming drum machines, practising complex meters, or aligning two independent rhythmic layers.
Last updated: September 2026
Formula below · 2 sources (aes.org, Wikipedia) · Updated Sep 2026
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About this calculator
A metronome beat at a given BPM defines a master pulse, but music regularly subdivides that pulse into smaller equal parts or overlays it with competing rhythms. This calculator uses the formula: clicks per minute = masterTempo × subdivision × polyrhythm. Multiplying the tempo by the subdivision value (e.g., 2 for eighth notes, 4 for sixteenth notes) gives the rate of subdivided clicks. The polyrhythm ratio gives the rate of a second, cross-rhythm layer — for example, 3:2 means three evenly spaced pulses across the same span as two master pulses, so that layer runs 1.5× faster. Divide the result by 60 for clicks per second. The Accent Every setting marks which clicks carry emphasis (every 3rd, every 5th…) to help performers feel groupings in meters like 5/4 or 7/8; it does not change the click rate, so it does not change the result.
How to use
Set masterTempo = 120 BPM, subdivision = 4 (sixteenth notes), polyrhythm = None (1:1). Apply the formula: clicks per minute = 120 × 4 × 1 = 480, which is 8 clicks every second. Now add a 3:2 polyrhythm (polyrhythm = 1.5): 120 × 4 × 1.5 = 720 clicks per minute (12 per second) — the cross-rhythm layer fires 50% more often, creating the characteristic feel of Afro-Cuban clave.
Frequently asked questions
How do I calculate the duration of a sixteenth note at a given BPM?
First convert BPM to beats per second by dividing by 60 — at 100 BPM that is 1.667 beats per second. One beat equals one quarter note, so a sixteenth note is one quarter of that duration: 1 / (1.667 × 4) = 0.15 seconds, or 150 milliseconds. Knowing exact note durations in milliseconds is essential for programming delay effects, quantising MIDI recordings, and synchronising audio to picture in film scoring.
What is a polyrhythm and how does it differ from a subdivision?
A subdivision divides each beat into equal smaller parts within a single rhythmic layer — for instance, playing four sixteenth notes per quarter-note beat. A polyrhythm places two or more independent rhythmic streams simultaneously where each stream has a different number of pulses over the same timespan, such as three against two (3:2) or four against three (4:3). Subdivisions feel like zooming into the grid, while polyrhythms feel like two separate grids pulling against each other, creating rhythmic tension and forward momentum.
When should musicians use accent patterns in complex meters?
Accent patterns are especially important in asymmetric meters like 5/4, 7/8, or 11/16, where the beats do not divide into equal groups. Accenting certain subdivisions — for example, grouping 7/8 as 2+2+3 — gives the meter a recognisable shape that performers and listeners can follow. Without clear accent markers, irregular meters feel random and difficult to feel naturally. Drummers, conductors, and composers use accent patterns to communicate the internal structure of a bar to the whole ensemble.