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Time Signature Bars to Seconds Calculator

Convert a number of bars into seconds for any time signature and tempo — know exactly how long an intro, loop or section will run.

Tempo

Beats per bar (top number)

Beat value (bottom number)

Number of bars

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How it works

Seconds per beat = 60 ÷ BPM · Seconds per bar = beats-per-bar × seconds-per-beat · Total = seconds-per-bar × number of bars

Tempo in BPM tells you how many beats pass each minute, so one beat lasts 60 ÷ BPM seconds. The top number of the time signature is how many of those beats fill a bar, so a bar lasts that many beats times the per-beat time. Multiply by the number of bars for the total. This assumes the tempo refers to the note in the bottom of the time signature, which is the usual convention (a quarter note in 4/4, an eighth in 6/8 counted in eighths).

Worked example

At 120 BPM one beat is 60 ÷ 120 = 0.5 s. In 4/4 a bar holds 4 beats, so each bar is 4 × 0.5 = 2 s. Eight bars therefore run 8 × 2 = 16 seconds — a typical intro length.

Frequently asked questions

Does the bottom number change the timing?

Only if your tempo marking refers to a different note. This calculator assumes BPM counts the beat value shown in the bottom of the signature, which matches how DAWs and metronomes treat it. Compound meters like 6/8 are often felt in dotted-quarter pulses — set the beats and BPM to match how you count.

How many bars fit in a 30-second radio bed?

Divide 30 by the seconds-per-bar figure. At 120 BPM in 4/4 that is 30 ÷ 2 = 15 bars, so a 16-bar loop is just over 30 seconds.

Why do I need this for looping?

Matching a loop to an exact number of bars keeps it seamless. Knowing a section is, say, 16.0 seconds lets you set precise loop points and line samples up with the grid.

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This calculator is for educational purposes. Double-check important results before acting on them.