How Many Bars Should a DJ Intro Have?
8, 16 or 32 bars? How phrasing works in 4/4 dance music, how long an intro really is at different tempos, and how to choose the right length for your style.
· 5 min read
Short answer: a multiple of 8 bars – most often 16 or 32. The right length depends on your genre and how you mix. Here is why.
Bars, beats and phrases
Almost all club music is in 4/4 time: one bar has four beats. Bars are grouped into phrases, most commonly 8 bars long, and arrangements change at phrase boundaries – the breakdown starts, the vocals come in, the drop hits.
That’s why intro lengths are multiples of 8. If your intro is 16 bars long and you start it at the beginning of a phrase in the outgoing track, the new track’s first beat lands at the start of a phrase too. Both tracks “change” at the same time, which sounds intentional.
4 bars in 4/4 = 16 beats. A 16-bar intro is 64 beats.
How long is that in seconds?
One bar lasts 4 × 60 ÷ BPM seconds. That gives these lengths:
| Tempo | 1 bar | 8 bars | 16 bars | 32 bars |
|---|---|---|---|---|
| 100 BPM | 2.4 s | 19.2 s | 38.4 s | 76.8 s |
| 120 BPM | 2.0 s | 16.0 s | 32.0 s | 64.0 s |
| 128 BPM | 1.875 s | 15.0 s | 30.0 s | 60.0 s |
| 140 BPM | 1.71 s | 13.7 s | 27.4 s | 54.9 s |
So a 32-bar intro at 128 BPM gives you a full minute to mix in.
Which length for which style?
There is no official standard, but common practice looks like this:
- 8 bars – quick mixes, open-format and hip-hop sets where you change tracks often.
- 16 bars – a good default for most genres: enough time to beatmatch and blend.
- 32 bars – long blends in house, techno and similar styles.
If you play both styles, build the longer version: it’s easy to start a 32-bar intro halfway through, but you can’t make a short intro longer in the mix.
Common mistakes
- Odd lengths such as 6 or 10 bars: the drop lands off-phrase and feels early or late.
- Counting in seconds instead of bars: “30 seconds” is 16 bars at 128 BPM but only about 12.5 bars at 100 BPM.
- A loop that doesn’t start on the beat: even if the length is right, the transition into the track will stumble.
Setting intro length in DJsExtended
In DJsExtended you set the loop length and the number of repeats separately – e.g. a 4-bar loop × 4 = 16 bars – and the app always shows the result in bars, beats and seconds.