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40 BPM Metronome
A metronome running at 40 beats per minute — one click every second and a half. This is the slowest tempo most classical scores ever ask for, and one of the hardest to play accurately.
40 BPM 1500.0 ms per beat Grave
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Generate drum loops with Drumloop AIWhat 40 BPM is for
Forty beats per minute sits at the bottom of the grave marking, and it is slow enough that the gap between clicks becomes a problem in itself. At this speed there is roughly a second and a half of silence between beats, which is far longer than the brain can comfortably hold an internal pulse. Most players who drift at 40 BPM are not bad at slow playing; they are trying to feel a pulse that has effectively stopped.
The fix is subdivision. Switch the metronome to eighths or sixteenths and the same tempo becomes playable, because you are now tracking a click every 750 or 375 milliseconds instead of every 1,500. Practising this way is the single most useful thing 40 BPM offers: it exposes whether your time is genuinely internal or whether you have been leaning on a fast click to carry you.
Musically, tempos this slow belong to funeral marches, some Mahler and Bruckner adagios, extremely slow blues, and doom and funeral doom metal, where a 40 BPM half-time feel produces bars that last six seconds. Producers also use 40 BPM as a mathematical convenience: it is exactly half of 80 and a third of 120, so a 40 BPM pulse lines up cleanly with faster material for layering.
Where 40 BPM shows up
| Use | Detail |
|---|---|
| Funeral doom | Riffs at 40 BPM or slower, usually with the snare on beat 3 only. |
| Grave classical | The slowest standard marking; Chopin and Mahler both wrote here. |
| Subdivision practice | The best tempo for testing whether your internal clock is real. |
| Halftime reference | Exactly half of 80 BPM, so both grids align every other click. |
Note lengths at 40 BPM
Useful when you are setting a tempo-synced delay, an LFO rate or an envelope release at this tempo. The full calculator covers every note value including dotted and triplet variants.
| Note | Milliseconds | Per second |
|---|---|---|
| Whole note | 6000.0 | 0.17 |
| Half note | 3000.0 | 0.33 |
| Quarter note (beat) | 1500.0 | 0.67 |
| Eighth note | 750.0 | 1.33 |
| Sixteenth note | 375.0 | 2.67 |
Frequently asked questions
Why is playing at 40 BPM so difficult?
Because 1.5 seconds of silence is longer than most people can hold a steady internal pulse. Research on rhythmic perception puts the comfortable range for tracking a beat at roughly 60–150 BPM; below that, the brain stops hearing a pulse and starts hearing isolated events. Turning on eighth or sixteenth subdivisions restores a trackable click and makes the tempo playable.
What tempo marking is 40 BPM?
Grave, the slowest of the standard Italian markings, which covers roughly 20–40 BPM. It sits just below largo (40–60 BPM). Grave means "solemn" rather than simply slow, and scores using it usually want weight as well as speed.
Can I get drum loops at 40 BPM?
Yes. Drumloop AI generates original, royalty-free drum loops at exactly 40 BPM from a plain-English description.
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Need a groove at 40 BPM?
Describe the beat in your head and Drumloop AI generates it — original, royalty-free, at exactly 40 BPM.