Song Duration Calculator
Estimate an arrangement’s length from its tempo, meter and bar count.
Secure. Data stays in your browserIn 6/8, a dotted quarter tempo counts two pulses per bar. A quarter note tempo counts three quarter notes per bar.
64.00 seconds · 2.00 seconds per bar
32 bars at 120 BPM in 4/4.
Assumes constant tempo. Include repeats in your bar count and add pauses separately.
Calculate the length of an arrangement
Enter the number of bars actually played, including repeated sections. Set the time signature and choose the note value used by the tempo marking. The calculator converts each bar into tempo beats, then multiplies by the time per beat.
Tempo and meter work together
At a quarter note tempo of 120 BPM, a beat lasts half a second. A 4/4 bar contains four quarter notes, so 32 bars last 64 seconds. In 3/4 at the same tempo, 32 bars last 48 seconds. For 6/8 with a dotted quarter tempo of 120, each bar has two tempo beats: 32 bars last 32 seconds.
Planning a song with different sections
Calculate each section separately if its tempo or meter changes, then add the durations. A pickup can be entered as a fraction of a bar. Held endings, spoken introductions, fermatas and free time need an additional allowance: a bar count alone cannot predict them.
Using the Song Duration Calculator
Estimate how long an arrangement will run from its bars, tempo and meter. This is most useful when the song follows one steady tempo and you know which note value the BPM counts.
Instructions
- Enter Tempo (BPM) and Number of bars, then set Beats per bar (numerator) and Note value (denominator).
- Choose Tempo beat unit to match your tempo marking, such as a quarter note or dotted quarter note.
- Read the duration and seconds per bar. Change one setting at a time to compare arrangements.
Checking your timing inputs
At 120 quarter-note BPM, 32 bars of 4/4 last 64 seconds. The same bars in 3/4 last 48 seconds. A dotted-quarter tempo in 6/8 counts two main beats per bar, so choosing the correct beat unit matters.
What to do if the duration does not match a recording
- Check whether BPM means quarter notes, eighth notes or dotted quarter notes. A different beat unit changes the answer.
- Include repeated sections in the total bar count. Do not count just the unique bars on a chart.
- Add pauses, introductions and tempo changes separately. Empty or out-of-range fields need correcting before a duration can be shown.
Use the result to plan an arrangement, then time a complete run-through. A constant-tempo estimate cannot account for rubato or a held final chord.
