Tempo Calculator
Producers and musicians constantly convert tempo into time. This calculator turns a tempo in beats per minute into note durations and delay times in milliseconds. Enter the BPM and read off the quarter, eighth, sixteenth, dotted, and triplet values, ready to dial into a delay or set as a note length. The relationship is exact: a minute is 60,000 milliseconds, so a quarter note equals 60,000 divided by the tempo. Use these figures to keep echoes, gates, and rhythmic effects locked to the groove of your track.
Tempo formula
Quarter note ms = 60,000 / BPM
Eighth note ms = quarter / 2
Sixteenth note ms = quarter / 4
Dotted eighth ms = eighth * 1.5
Eighth triplet ms = eighth * 2 / 3
Whole note ms = quarter * 4
A minute is exactly 60,000 milliseconds, so every value is a clean ratio of the quarter-note duration. No measured constant is involved.
Putting it to work
- Set a delay to the eighth-note value for a classic in-time echo.
- Dotted eighth delays create the bouncing, off-beat feel heard in many guitar and synth lines.
- Triplet values give a swung, rolling rhythm against straight notes.
- Use the whole-note value for slow pads, swells, and long reverb pre-delays.
- Halving or doubling the BPM keeps the same groove at a different feel.
Tempo: frequently asked questions
How do you convert BPM to milliseconds?
One beat, a quarter note in common time, lasts 60,000 milliseconds divided by the tempo in beats per minute. At 120 BPM that is 500 milliseconds per quarter note. Other note values scale from this: an eighth note is half, a half note is double, and so on.
What is the delay time for an echo in sync with the tempo?
Set the delay time on your effect to the millisecond value of the note division you want. A quarter-note delay at 120 BPM is 500 ms, an eighth-note delay is 250 ms, and a sixteenth is 125 ms. These keep the echoes locked to the beat.
What is a dotted note duration?
A dotted note lasts one and a half times its base value, because the dot adds half again. A dotted eighth at 120 BPM is 250 ms times 1.5, which is 375 ms. Dotted delays create a syncopated, bouncing feel common in many productions.
What is a triplet duration?
A triplet divides a beat into three equal parts instead of two, so each triplet note lasts two-thirds of the straight value. An eighth-note triplet at 120 BPM is 250 ms times two-thirds, about 166.67 ms.
Why is the relationship exact?
Tempo is defined as beats per minute and a minute is exactly 60,000 milliseconds, so the conversion is pure arithmetic with no measured constant. The calculator simply divides and scales by the standard note-value ratios.
Official sources
- National Institute of Standards and Technology: unit conversion reference (minutes, milliseconds).
- Library of Congress: National Recording Preservation Board (music time and tempo context).
Reviewed by the CalculatorHub team, edited by James Graham, 16 June 2026. See our methodology.