Note Duration Calculator – BPM to Milliseconds & Seconds

BPM stands for Beats Per Minute. It measures the tempo of a piece of music by counting how many beats occur in one minute. In most modern music (especially electronic genres), one beat equals one quarter note. A BPM of 120 means there are 120 quarter-note beats per minute — or one beat every 500 milliseconds.

The formula is simple: Quarter note duration (ms) = 60,000 ÷ BPM. For example, at 120 BPM: 60,000 ÷ 120 = 500 ms per quarter note. From there, you can calculate any note value: eighth note = quarter ÷ 2, sixteenth note = quarter ÷ 4, whole note = quarter × 4, dotted note = note × 1.5, triplet = note × 2/3.

Music producers frequently need precise millisecond values for setting delay times, reverb pre-delay, compressor attack/release, LFO rates, and gate timings in their DAW or effects plugins. Many hardware and software effects require time in milliseconds rather than note values. Syncing these times to the project BPM ensures rhythmic coherence.

Tap Tempo lets you find a song's BPM by tapping along with the beat. Each tap records a timestamp, and the tool calculates the average interval between your taps to determine the BPM. For best accuracy, tap at least 4–8 times consistently. The tool averages your last several taps and updates the BPM display in real time. It resets automatically if you stop tapping for more than 2.5 seconds.

A dotted note has a small dot after it, increasing its duration by 50% (×1.5). For example, a dotted quarter note at 120 BPM lasts 750 ms (500 ms × 1.5). Dotted notes are very common in delay effects — the famous "dotted eighth" delay creates a distinctive rhythmic pattern heard in countless pop and rock songs.

Triplets divide a beat into three equal parts instead of the usual two or four. Each triplet note lasts 2/3 (about 66.7%) of the regular note duration. For example, a quarter-note triplet at 120 BPM lasts approximately 333.33 ms. Triplet-based delays and rhythms create a rolling, swung feel that's essential in blues, jazz, and modern trap music.

• Dub/Reggae: 60–90 BPM
• Hip Hop/Trap: 65–100 BPM (often half-time feel at 130–200)
• House: 115–130 BPM
• Techno: 120–150 BPM
• Trance: 125–150 BPM
• Drum & Bass: 160–180 BPM
• Dubstep: 140–150 BPM (often half-time feel)
• Pop/Rock: 100–130 BPM

For most musical applications, 1–5 ms precision is perfectly adequate. The human ear generally cannot distinguish timing differences below about 5–10 ms. However, for very short times (like flanger/chorus delays or phase alignment), sub-millisecond precision can matter. Our calculator provides values to 2 decimal places, which covers all practical music production needs.