 # How To Calculate Delay And Reverb Times Like A Nerd The grooves and flow of a song are reinforced by syncing compressors, delays, and reverbs to the tempo of the song. But what happens if your delays, reverbs, or compressors don’t have a tempo sync feature?

Below, I will show you how to calculate the note length in milliseconds like a nerd. How to convert a tempo from beats-per-minute (BPM) to time in milliseconds (ms) to free you from this limitation and enhance your music productions.

## You will learn how to calculate delay and reverb timing to enhance the groove of a song!

Without getting too technical, all you need to know is the tempo of the song in beats-per-minute and the length of the note we want. For quarter note synced reverbs and delays, our desired note length would be (1/4). For a whole note, you would use (1/1) or just (1). An eighth note would be (1/8).

## Got it? Good, let’s get to the math!

Below is the equation to calculate the note length in milliseconds: “240,000 ms” /”[Tempo in BPM]” “× [Desired Note Length]”

Pretty simple right? Let’s say you want your reverb to be as long as a 1/4 note and the tempo of the song is 123 BPM. You would enter: “240,000 ms” /”123 BPM” “× [1/4 Beat] = 487.80 ms”

Or entered into a calculator: 240,000 ÷ 123 ÷ 4

To calculate the note length for triplet notes, you multiply the above note length by (2/3) or use the equation below:

*A triplet is a rhythm playing three notes in the space of two. “160,000 ms” /”[Tempo in BPM]” “× [Desired Triplet Note Length]”

### Why do you multiply by 2/3?

The time it takes to play 3 triplet quarter notes (or any note like 1/8, 1/16, etc.) is the same amount of time as it takes to play 2 regular quarter notes. So much like converting between inches and centimeters, you multiply by (2/3) to convert from standard to triplet notes. Lastly, for dotted notes, you multiply the first equation by (3/2) or use the equation below:

*A dotted note is equivalent to writing the basic note tied to a note of half the value. “360,000 ms” /”[Tempo in BPM]” “× [Desired Dotted Note Length]”

The time it takes to count 3 quarter notes (or 1/8, 1/16, etc.) is the same amount of time to count 2 dotted quarter notes. Mathematically speaking, this tells you that the dotted notes are the inverse of a triplet note! 