How long is
8 bars at 128?

Enter a BPM. Get exact loop lengths and delay/echo times, instantly — no mental math.

BPM

Loop lengths

Assumes 4/4 time — 4 beats per bar

Straight, dotted, and triplet values in milliseconds

Note value	Straight	Dotted	Triplet

Two formulas, both derived straight from BPM.

1 bar

One bar = 4 beats. Beat length is 60 ÷ BPM seconds, so a bar is 240 ÷ BPM seconds. Everything else is that number, multiplied.

A quarter note is 60,000 ÷ BPM in milliseconds. Every other note value is a fraction or multiple of that same number.

×1.5 / ×⅔

Dotted = straight value × 1.5. Triplet = straight value × ⅔. Same trick musicians have used forever, just precomputed.

Loop lengths at common tempos8 bars at 128 BPM = 15 seconds — plus 4, 16, and 32 bars at 7 popular tempos

BPM	4 bars	8 bars	16 bars	32 bars
90	10.67s	21.33s	42.67s	1:25.3
100	9.60s	19.20s	38.40s	1:16.8
120	8.00s	16.00s	32.00s	1:04.0
124	7.74s	15.48s	30.97s	1:01.9
128	7.50s	15.00s	30.00s	1:00.0
140	6.86s	13.71s	27.43s	54.86s
174	5.52s	11.03s	22.07s	44.14s

No counting bars by hand. Drop songs in and every section snaps cleanly to the grid, ready to arrange.