BPM / Metronome Calculator
Convert between BPM, beat duration in ms, and measure length in seconds.
Find the Italian tempo marking (Largo to Prestissimo) and note values at any BPM.
BPM (Beats Per Minute) is the standard measure of musical tempo. This calculator converts BPM into precise timing values for every note subdivision, which is essential for musicians, producers, and sound engineers.
Formulas:
Beat duration (ms) = 60,000 / BPM
Measure duration (ms) = Beats Per Measure × (60,000 / BPM)
What each variable means:
- BPM — the number of beats that occur in one minute. A higher BPM means faster music.
- Beats Per Measure — determined by the time signature. In 4/4 time (most common), there are 4 beats per measure. In 3/4 (waltz), there are 3.
Note subdivision durations (all derived from the quarter note):
- Half note = beat duration × 2
- Dotted quarter = beat duration × 1.5
- Eighth note = beat duration / 2
- Sixteenth note = beat duration / 4
- Triplet quarter = beat duration × 2/3
Common tempo markings:
- Largo: 40–60 BPM (very slow, solemn)
- Adagio: 60–80 BPM (slow, expressive)
- Andante: 80–100 BPM (walking pace)
- Moderato: 100–120 BPM (moderate)
- Allegro: 120–156 BPM (fast, lively)
- Vivace: 156–176 BPM (very lively)
- Presto: 176–200 BPM (very fast)
Practical example: At 120 BPM, the beat duration = 60,000 / 120 = 500 ms. A full measure in 4/4 time = 4 × 500 = 2,000 ms (2 seconds). An eighth note = 250 ms, and a sixteenth note = 125 ms.
When to use this calculator: Use it when setting delay or reverb times in a DAW (digital audio workstation) to sync effects with your song’s tempo. Also useful for practice — knowing the exact millisecond timing helps when programming drum machines or sequencers. Composers use it to convert between Italian tempo markings and exact BPM values.