FIELD NOTES
What your tapped tempo can tell you
Measure a pulse without mistaking a precise number for a perfect performance.
Tap the pulse you mean
Listen for a regular beat before you start. Tap a comfortable repeating pulse, rather than every sound in the arrangement. A kick drum may play an irregular pattern, so following every kick is not a reliable rule. Counting aloud can help you choose a consistent level of the beat.
Use the large button on a phone, or press T on a keyboard. Tap 8–16 beats while the music plays. The first two taps give only one interval: useful for a first estimate, but vulnerable to a late or early tap. More intervals describe your recent tapping more clearly; they do not certify the tempo of a recording.
Read the window, not just the big number
Pulse & Bar divides 60,000 milliseconds by the mean interval between your latest taps. It keeps at most 17 taps, or 16 intervals. At regular intervals of 500 ms, the result is 120 BPM. If one interval is 400 ms and the next is 600 ms, the average is still 500 ms, even though the taps were uneven.
The interval display exposes that difference. Variation is the standard deviation of interval lengths divided by their mean, expressed as a percentage. For 400 and 600 ms, it is 20%. A small value says the recent intervals were similar. It cannot establish whether you chose the right beat, or whether your taps align with the music.
Keep the uncertainty useful
Human reaction, the input device, browser timing and an expressive performance can all affect a sample. Do not interpret 119.87 BPM as evidence that a song was composed at precisely that tempo. Try another passage and listen against a click. A track may also change speed, so a single number may only describe part of it.
Every accepted tap contributes to the window. There is no hidden outlier removal to turn an uneven performance into a tidy result. A pause longer than three seconds starts a new series. This supports a 20–300 BPM working range; slower pulses need a different sampling convention.
Take one next step
Use the measured tempo in the practice metronome, then listen to whether the musical pulse fits. If it feels twice as fast or half as fast, read the guide to half and double tempo. The tool does not listen to, identify or upload a song.
Reviewed 31 October 2026 · Methods & sources