Beats Per Minute Calculator
Tempo in beats per minute tells you how fast a piece of music moves, but to set a tempo-synced delay or to understand note timing you need that tempo expressed in milliseconds. This calculator does the conversion exactly: enter a tempo and it returns the duration of a single beat (a quarter note), along with the half, whole, eighth, sixteenth, and dotted-eighth note durations. Producers use these times to lock effects to the beat, and musicians use them to feel how note values map onto real seconds at any tempo.
Tempo to milliseconds formula
Quarter note (beat) = 60,000 / BPM
Half note = quarter note * 2
Whole note = quarter note * 4
Eighth note = quarter note / 2
Sixteenth note = quarter note / 4
Dotted eighth note = eighth note * 1.5
One minute contains 60,000 milliseconds, so dividing by the beats per minute gives the time for one beat. Every other note value is a simple multiple or fraction of the beat, and the dot adds half the note's own length.
Music timing context
- 120 BPM, a common pop and dance tempo, gives a 500 millisecond beat.
- Tempo-synced delays use the eighth or dotted-eighth time to make echoes fall on the groove.
- The conversion depends only on tempo and note value, never on the time signature.
- A dotted note adds half its value, so a dotted eighth equals three sixteenth notes.
- Many digital audio workstations let you enter delay time in note values; this tool shows the equivalent milliseconds.
Beats per minute: frequently asked questions
How do I convert BPM to milliseconds per beat?
There are 60,000 milliseconds in one minute, so the duration of one beat is 60,000 divided by the tempo in beats per minute. At 120 BPM a beat lasts 500 milliseconds; at 60 BPM it lasts 1,000 milliseconds. This quarter-note duration is the basis for every other note value.
How are note durations related to the beat?
In common time the quarter note equals one beat. A half note lasts two beats, a whole note four beats, an eighth note half a beat, and a sixteenth note a quarter of a beat. So from the quarter-note duration you double it for a half note and halve it for an eighth note, and so on.
What is this useful for?
Sound engineers and producers use these durations to set delay and reverb times that lock to the song's tempo. A delay set to the eighth-note time, for example, produces echoes that fall on the beat. The same figures help drummers and musicians understand how note values translate into real time.
What is a dotted note duration?
A dotted note lasts one and a half times the base note value, because the dot adds half of the note's duration. A dotted eighth note therefore lasts 1.5 times the eighth-note time. Dotted-eighth delays are a common effect in popular music. This calculator shows the dotted-eighth time alongside the straight values.
Does the time signature change these numbers?
The millisecond duration of a note depends only on the tempo and the note value, not the time signature. The time signature tells you how many of which note value make up a bar, but a quarter note at 120 BPM is always 500 milliseconds regardless of whether the piece is in 4/4 or 3/4.
Official sources
- NIST: SI units, the second.
- Library of Congress: Music notation reference materials.
Reviewed by the CalculatorHub team, edited by James Graham, 16 June 2026. See our methodology.