Fun Music

BPM to milliseconds

Tempo

BPM

Note value

Beats per bar

Selected note 468.75 ms

128 BPM · quarter = 468.75 ms ms

Straight note values

Whole note 1,875 ms

Half note 937.5 ms

Quarter note 468.75 ms

Eighth note 234.38 ms

Sixteenth note 117.19 ms

As a frequency 2.133 Hz

1 ms = 44.1 samples at 44.1 kHz

A quarter note in milliseconds is 60,000 divided by the tempo. At 128 BPM that is 468.75 ms, an eighth is 234.375 ms, and a sixteenth 117.19 ms. Going the other way, 60,000 divided by the millisecond length gives the tempo.

How to convert between tempo and milliseconds

1 Enter the tempo to get every note length.

2 Or switch tabs and enter a measured length to get the tempo back.

3 Pick which note value the measurement represents.

4 Use the sample count if you are editing at the sample level.

Sample counts matter once you are trimming loops rather than setting effects. At 44.1 kHz, one millisecond is 44.1 samples, so a 500 ms beat is 22,050 samples exactly — which is why 120 BPM loops slice cleanly at that sample rate and awkward tempos do not. A loop cut a few samples short accumulates drift over repeats, audible as a gradual slide against a grid.

Questions

How do I convert BPM to ms? −

Divide 60,000 by the tempo for a quarter note; halve it for an eighth, and so on.

How do I convert ms back to BPM? +

How many samples is a beat? +

Why does my loop drift? +

What is 128 BPM in ms? +

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