How to Calculate Delay and Reverb Times From BPM

When an echo lands on a beat subdivision, it reinforces the rhythm instead of fighting it. A delay set to a random time smears the groove, while a delay locked to an eighth or quarter note feels intentional and musical. That is why producers convert the track tempo into precise millisecond values before setting a delay plugin or pedal.

The core formula is simple: one quarter note in milliseconds equals 60000 divided by the BPM. At 120 BPM that is 500 ms per quarter note. From there every other subdivision is just a fraction or multiple of that number.

Once you have the quarter-note time, an eighth note is half of it, a sixteenth is a quarter of it, and a half note is double. At 120 BPM that gives 250 ms for an eighth and 125 ms for a sixteenth. These straight values are your everyday rhythmic echoes.

Dotted notes add half of the note value again, so a dotted eighth is the eighth-note time times 1.5. Dotted-eighth delay is the classic shimmering guitar sound heard on countless records. Triplet notes take two-thirds of the straight value, giving a rolling, galloping feel. Having all three columns in front of you makes it easy to pick the one that fits the part.

Reverb decay can also be matched to tempo so the tail clears before the next transient rather than blurring it. A common approach is to set pre-delay to a small subdivision, such as a sixteenth note, so the dry signal stays crisp before the reverb blooms.

For decay time, aim for the reverb tail to fade roughly as one beat or one bar ends, depending on how dense the mix is. Faster songs generally want shorter tails. These are starting points, not rules, so trust your ears once the numbers get you close.

The calculator does all the arithmetic and lays out straight, dotted, and triplet columns at once. It runs entirely in your browser with no upload, so you can use it offline once the page is loaded.

Many plugins offer a tempo-sync button that snaps to subdivisions automatically, but analog pedals and some hardware units only accept raw milliseconds. That is where a printed value is essential. Dial the pedal to the calculated time and the echo locks to the song.

If a delay feels slightly off even at the correct value, check whether your DAW tempo matches the actual performance, since live playing can drift. For freely played passages, choose a subdivision by feel rather than forcing a grid that the performance never followed.