In 4/4 time, one bar lasts 240 divided by the BPM seconds. At 90 BPM, 16 bars last about 42.7 seconds.

How many bars is a one-minute song?

Bars = seconds times BPM divided by 240 in 4/4. At 90 BPM, 60 seconds is 22.5 bars.

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Bars calculator

Quick answer: in 4/4 time, one bar lasts 240 ÷ BPM seconds. At 90 BPM that is 2.67 seconds, so 16 bars last about 42.7 seconds.

BPM Time signature Bars …or seconds (to find the bars)

–

One bar–

Bars in your seconds–

Syllables that fit–

A rule of thumb: about 8 to 12 syllables a bar at a relaxed flow, more for fast rap.

Common lengths

Bars	80 BPM	90 BPM	100 BPM	140 BPM

Write a verse that fits

The maths

A beat is one count, a bar in 4/4 has four counts. Seconds per bar = 60 ÷ BPM × 4 = 240 ÷ BPM. Multiply by the number of bars for the length of a verse.