Arrangement calculator

Bars to seconds and time calculator

Convert bars to seconds or minutes by BPM and time signature. See instant 4, 8, 16 and 32-bar durations; 16 bars at 120 BPM is 32 seconds.

Bars to seconds: settings and guide

Quarter-note tempo

BPM

Bars

bars

Time signature

Total duration0:32.00032 seconds · 64 quarter-note equivalents · 4/4

4 bars0:08.000

8 bars0:16.000

16 bars0:32.000

32 bars1:04.000

Tempo is defined as quarter-note BPM. Clock displays use exact nearest-millisecond rounding; the seconds line shows up to 12 significant digits.

Formula

How to convert bars to seconds

Convert each bar into quarter-note equivalents from the time-signature numerator and denominator. Multiply by the number of bars, divide by quarter-note beats per minute, then multiply by 60 for seconds. This supports quarter- and eighth-note meters without treating 6/8 as six quarter notes.

seconds = bars × numerator × (4 ÷ denominator) × 60 ÷ quarter-note BPM

01
Choose the complete time signature; 6/8 contains three quarter-note equivalents per bar, while 7/8 contains three and a half.
02
Calculate individual sections to plan intros, drops, ad breaks or fixed-length cues.
03
The result assumes a constant tempo with no pauses, ramps or tempo changes.

Worked example

Example: 16 bars at 120 BPM

Sixteen bars of 4/4 contain 64 quarter-note beats. At 120 beats per minute, 64 beats last 32 seconds, so a 16-bar section runs for 0:32.

Good to know

Assumptions and limits

The tempo stays constant for the full section.
Tempo is entered as quarter-note BPM, matching a standard DAW tempo grid.
The time-signature denominator determines the note value represented by the numerator.
Clock displays use exact nearest-millisecond rounding; the seconds line shows up to 12 significant digits.
Count-ins, pauses, fermatas and tempo ramps are not included.

Review BeatTiming's calculation accuracy, precision and release-testing methodology.

4/4 quick reference

How many seconds is 16 bars?

Bar length depends on tempo and time signature. In 4/4, 16 bars last 38.4 seconds at 100 BPM, 32 seconds at 120 BPM and 30 seconds at 128 BPM. Use the chart for common 4, 8, 16 and 32-bar section lengths.

Bars to seconds chart (4/4)

Seconds in 4, 8, 16 and 32 bars at 100, 120 and 128 BPM in 4/4 time
Bars	100 BPM	120 BPM	128 BPM
4	9.6 sec	8 sec	7.5 sec
8	19.2 sec	16 sec	15 sec
16	38.4 sec	32 sec	30 sec
32	76.8 sec	64 sec	60 sec

Audio sample length calculator Turn a bar length into duration, sample frames and packed PCM payload size.
Loop BPM calculator Work in reverse: find a sample's tempo from its measured duration and musical length.
DJ set length calculator Plan a complete performance from average track time and transition overlap.
Classroom tempo lesson and worksheets Use bars, beats and duration in a guided music technology lesson with an answer key.

Quick answers

Frequently asked questions

How many seconds is 16 bars?

There is no single duration without a tempo. In 4/4, 16 bars contain 64 quarter-note beats, so they last 38.4 seconds at 100 BPM, 32 seconds at 120 BPM, or 30 seconds at 128 BPM.

How do I calculate a 3/4 or 6/8 section?

Choose the complete time signature. At quarter-note BPM, one 3/4 bar contains three quarter notes and one 6/8 bar contains three quarter-note equivalents.

Does this handle tempo changes?

Calculate each constant-tempo section separately, then add the durations together.