Find the length
of your next loop.
Turn tempo and bars into seconds. A simple reference for recording a phrase, checking its boundary, or planning a practice session.
Your loop lasts
4 bars × 4 quarter notes at 120 BPM
The math behind the loop.
One quarter note lasts 60 ÷ BPM seconds. Multiply that by the number of quarter notes in a bar, then by the number of bars:
Seconds = (60 ÷ BPM) × beats per bar × bars
At 120 BPM, each quarter note lasts half a second. Four bars of 4/4 contain 16 quarter notes, so the loop lasts eight seconds. This tool uses quarter-note BPM and time signatures with a denominator of 4. It does not treat a dotted-quarter tempo in 6/8 as equivalent.
A quick reference for 4/4.
| BPM | 1 bar | 2 bars | 4 bars | 8 bars |
|---|---|---|---|---|
| 60 | 4 s | 8 s | 16 s | 32 s |
| 90 | 2.667 s | 5.333 s | 10.667 s | 21.333 s |
| 120 | 2 s | 4 s | 8 s | 16 s |
| 140 | 1.714 s | 3.429 s | 6.857 s | 13.714 s |
A reference, not a timing correction.
The result assumes a steady tempo. It does not measure your audio or account for a freely played phrase. If a loop feels late, first separate monitoring delay from a badly closed boundary with our latency troubleshooting guide.
For a practical two-bar exercise, follow the first-loop guide. All calculator inputs stay in your browser.