Beats Per Bar Calculator

Work out beats per bar instantly with clear inputs, formula shown and shareable results.

About Beats Per Bar Calculator

The top number gives beats per bar and the bottom gives the note value receiving the beat, so a bar is worth top x 4 / bottom quarter notes. Sequencers count tempo in quarter notes regardless of the written signature, which is why 7/8 at 140 bpm gives bars of 1.5 seconds rather than 3.

Formulas

Bar value

quarter notes per bar = top number x 4 / bottom number

Bar duration

seconds = quarter notes per bar x 60 / tempo

Worked example

With the default values below, Beats Per Bar Calculator returns Quarter note equivalents per bar of 3.5000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Time signature top numberaccepts 1–32: 7
Time signature bottom numberaccepts 1–64: 8
Number of barsminimum 1: 16
Tempo in quarter notesminimum 1 bpm: 140 bpm

Results

Quarter note equivalents per bar: 3.5000
Written beats per bar: 7
Duration of one bar: 1.500 s
Duration of the passage: 24.00 s

Step by step

1Values used
2Bar value
3Bar duration
4Quarter note equivalents per bar= 3.5000
5Written beats per bar= 7
6Duration of one bar= 1.500 s
7Duration of the passage= 24.00 s

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Beats Per Bar figure worked out?

quarter notes per bar = top number x 4 / bottom number. The top number gives beats per bar and the bottom gives the note value receiving the beat, so a bar is worth top x 4 / bottom quarter notes.

Why does this matter?

Sequencers count tempo in quarter notes regardless of the written signature, which is why 7/8 at 140 bpm gives bars of 1.5 seconds rather than 3.

What do I need to enter?

Enter time signature top number, time signature bottom number, number of bars, tempo in quarter notes. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.