BPM converter for delay times and note values

How BPM becomes delay time

Beats per minute is a tempo: how many steady pulses fit into one minute. To convert BPM to milliseconds, divide 60,000 by the tempo. At 120 BPM, one beat lasts 500 ms; at 60 BPM it lasts 1,000 ms; at 174 BPM, a common drum'n'bass tempo, one beat is about 344.83 ms. In 4/4 production work, that beat is usually treated as a quarter note, so a half note is two beats and an eighth note is half a beat.

Producers and mixing engineers use these values when setting unsynced delays, reverbs, tremolo, gates, sidechain release times, and modulation rates. A quarter-note delay repeats on the beat; an eighth or sixteenth delay feels tighter; dotted notes push the echo later by 50%; triplets divide the beat into three even parts. Those relationships follow standard note-duration names explained in basic rhythm lessons from musictheory.net.

Genre ranges are only starting points. A ballad might sit near 70 BPM, pop often lands around 120, dance records commonly center near 128, footwork is frequently around 160, and drum'n'bass is often near 174. The exact delay should still serve the groove, vocal space, and arrangement. Use the calculator for clean math, then fine tune by ear in context.

Seven tempos you will meet constantly

Every cell comes from the same formula: 60,000 divided by the tempo, then scaled by the note fraction. Nothing here is rounded to taste; the calculator above prints the same values to two decimal places for any tempo you type.

Dotted notes and triplets, the actual arithmetic

A dot extends a note by half its own length, so a dotted value is the plain value multiplied by 1.5. A triplet fits three notes into the space of two, so a triplet value is the plain value multiplied by two thirds. At 120 BPM an eighth note is 250 ms, its dotted cousin is 375 ms, and the eighth triplet is 166.67 ms. Those two multipliers explain the entire 18-row table above: six base notes from whole to 32nd, each with a dotted and a triplet variant.

Setting a dotted eighth delay by hand

Say the song sits at 120 BPM and the delay unit only has a time knob in milliseconds. One beat is 60,000 / 120 = 500 ms. An eighth note is half of that, 250 ms. Add the dot by multiplying by 1.5 and you land on 375 ms. Dial that in and each repeat falls three sixteenths after the note that fed it, which is why the dotted eighth is such a favourite for rhythmic guitar and synth parts: the echoes weave between the beats instead of stacking on top of them. The same three steps, divide, halve, add the dot, work at any tempo.

BPM and delay questions