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Straight duration × 2/3

Triplet calculator: 1/8T at 120 BPM = 166.666667 ms

At 120 BPM, an eighth-note triplet (1/8T) lasts about 166.666667 ms: 60000 ÷ 120 × 1/2 × 2/3. Enter any BPM to calculate quarter, eighth, sixteenth and other triplet durations.

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BPM means quarter-note beats. Time signature does not change this duration formula; swing, tempo maps, and device behaviour remain outside the calculation.