Tap Tempo
Tap a button to measure the BPM of any rhythm.
Overview
The tap tempo tool measures the BPM of any rhythm by letting you tap a button (or press a key) in time with the music. After a few taps it reports the average tempo, refining the estimate each additional tap. Use it to find the BPM of a song playing on the radio, a drummer's count-off, or your own internal pulse before you commit to a sequencer tempo.
It's a near-universal feature on DJ gear, drum machines, and effects pedals because it answers a fundamental question — "what tempo is this?" — without needing to count beats for a full minute. DJs use it to manually beatmatch tracks without metadata; pedal users tap in a delay time that locks to the band's groove; producers use it to extract a tempo from a recorded performance.
How it works
Each tap is a timestamp. The tool measures the gap between consecutive taps and converts it to BPM with 60,000 / gap_in_ms. Two taps give one interval, which is a rough estimate; more taps give more intervals, which the tool averages (often with the oldest tap weighted out after a few seconds) for a steady reading.
Quality of the estimate depends on the rhythm and the tapper. Tapping on every quarter-note at 120 BPM gives 500 ms intervals and a tight reading. Tapping erratically — early on some, late on others — spreads the intervals and the average converges more slowly. Most implementations also detect when you've stopped tapping (a long gap) and reset, so a new measurement starts fresh.
Examples
Tap interval: 500 ms → 120 BPM (steady)
Tap interval: 461 ms → 130 BPM (uptempo dance)
Tap interval: 750 ms → 80 BPM (slow ballad)
Tap interval: 343 ms → 175 BPM (drum-and-bass)
FAQ
How many taps should I do?
Four to eight is usually enough for a reliable reading. The first interval has the highest uncertainty; each subsequent tap reduces the standard error.
What if the song's tempo isn't steady?
A live performance or rubato track may have a varying tempo. The tap tempo gives you the average over the taps you provided — if you tap only during a chorus you'll get that section's average.
Am I tapping on the right beat?
For most pop music, tap on the snare (beats 2 and 4) or the kick (beats 1 and 3). The resulting BPM is the same as quarter-note tempo. If you're tapping eighth notes, divide the result by two.
Why does my tap tempo read half or double the actual tempo?
You're probably tapping on the half-time or double-time pulse. Both are valid interpretations; pick the one that matches the genre convention (rock kick on quarters, drum-and-bass on the perceived half-time backbeat).
Can I use this for very slow or very fast tempos?
Yes, within reason. At extreme tempos (under 40 BPM or over 220 BPM) human tapping accuracy drops, but the math holds for any interval.