How does BPM relate to compressor release time?

A quarter note lasts 60000 divided by BPM milliseconds. Setting the release to a note value, such as an eighth note, makes the compressor recover its gain right as the next subdivision hits, so the dynamics breathe in time with the music instead of fighting the groove.

What release time gives pumping sidechain compression?

For the classic pumping effect, set the release roughly to a quarter or eighth note so the level dips on each kick and swells back just before the next one. Too short and the pump is inaudible, too long and the track never recovers. Tempo-synced release values are the reliable starting point.

How short should compressor attack be?

A fast attack of 1 to 10 ms clamps transients and makes a sound smaller and more controlled. A slower attack of 20 to 50 ms lets the initial transient punch through before compression engages, which keeps drums and plucks snappy. Attack is usually set by feel rather than tempo.

Why sync release to the beat at all?

An un-synced release can recover at an awkward moment, causing the level to lurch against the rhythm and sound restless. Aligning release to a note value makes each gain recovery land on a musical subdivision, so the compression feels like part of the groove rather than an artefact.

Does this apply to limiters and gates too?

Yes. Gate release and limiter release both benefit from tempo-aware values for the same reason: recovery that lands on the beat sounds intentional. Limiters usually want shorter release than bus compressors to avoid pumping on a master, but the note-value table is still a useful reference.

What is the Compressor Attack & Release to BPM Calculator?

Convert any BPM into musically-aligned compressor attack and release times in milliseconds, from one bar down to a 32nd note. The foundation for pumping sidechain compression and transparent, groove-locked dynamics control in your mix. It runs free in your browser on Gera Tools, with nothing uploaded.

Compressor Attack & Release to BPM Calculator

Name: Compressor Attack & Release to BPM Calculator
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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A compressor’s release time decides how quickly the gain recovers after a peak — and if that recovery lands on the beat, the compression locks into the groove instead of fighting it. This tool converts your tempo into musically-aligned attack and release times for transparent dynamics or deliberate sidechain pumping.

How it works

The whole table is built on the quarter-note duration at your tempo:

quarter note (ms) = 60000 / BPM

From there, common note values are simple multiples and fractions:

1 bar (4/4) = quarter x 4
half note    = quarter x 2
quarter note = quarter x 1
eighth note  = quarter / 2
16th note    = quarter / 4
32nd note    = quarter / 8

Dotted and triplet variants follow the usual x1.5 and x0.6667 rules.

Note-value timings at common tempos

Note value	80 BPM	120 BPM	128 BPM	140 BPM
1 bar (4 beats)	3000 ms	2000 ms	1875 ms	1714 ms
Half note	1500 ms	1000 ms	938 ms	857 ms
Quarter note	750 ms	500 ms	469 ms	429 ms
Eighth note	375 ms	250 ms	234 ms	214 ms
16th note	188 ms	125 ms	117 ms	107 ms
32nd note	94 ms	63 ms	59 ms	54 ms

Choosing release

Set the release to the note value at which you want the gain fully recovered:

Bus / glue compression: quarter or eighth note — the mix breathes once per beat.
Sidechain pumping: quarter or eighth note synced to the kick — level dips on each hit and swells back just in time.
Transparent control: shorter values (16th) so recovery is fast and unobtrusive.
Drum bus: 16th to 32nd note release preserves the snare and hi-hat attack while still controlling dynamic peaks.

Choosing attack

Attack is judged by ear, not tempo, but the guideline is straightforward:

1 to 10 ms — fast; clamps transients, reduces punch, makes elements sound tighter and further back.
20 to 50 ms — medium; lets the initial transient punch through before compression engages, keeping drums and plucks lively.
80 ms+ — slow; barely touches transients at all; useful for gentle bus glue or levelling longer notes without affecting attack character.

On a drum room or overhead bus, a medium attack (15 to 30 ms) lets the crack of the snare through while catching the body — the sweet spot for adding size without losing snap.

Worked example

At 128 BPM, a quarter note is 60000 / 128 = 468.75 ms. An eighth-note release of about 234 ms gives a tight sidechain pump that recovers just before each off-beat; a quarter-note release of 469 ms gives a slower, deeper pump that breathes once per beat. For a vocal bus at 128 BPM, try a 10 ms attack and a 16th-note release (~117 ms) for transparent levelling that stays out of the way of the consonants.

All timings are computed locally in your browser.