BPM tapper
Tap the button, or press the space bar, once on every beat. The tempo is the average of your last eight taps, so it moves about for the first four and has usually settled by the eighth. Stop for two and a half seconds and the next tap starts a fresh measurement rather than counting the pause as one enormous beat.
How to find a tempo by tapping
What comes back is an average, not a measurement. The page never hears the track: there is no microphone and nothing is recorded — the only thing it knows about the music is the rhythm of your finger. That is usually enough, because a hand tapping along to a steady beat runs late and early in roughly equal measure and the errors cancel. It is still worth knowing which part of the reading is the track and which part is you.
Why only two of your taps set the number
Averaging eight consecutive gaps sounds like eight measurements weighed against each other. It is not. Those eight gaps add up to the time from the first tap in the window to the last, so the tempo is that span divided by eight and the six taps in between cancel out of the sum completely. They are not wasted: they are what the ± figure is computed from, and that figure is the only thing on the page that tells you whether the tempo deserves a decimal place. But the tempo itself rests on two taps a few seconds apart, which is why one late tap shifts the reading and then shifts it back eight taps later, when it falls out of the window. It is also why a longer run of tapping reads steadier than a short one: the two taps carrying the number are further apart, so the same wobble in your timing is a smaller fraction of the span between them.
The factor-of-two trap, and swing
Two mistakes produce a confidently wrong answer rather than an obviously wrong one. Tapping the hi-hat instead of the beat gives exactly double the tempo; tapping every other beat gives exactly half. That is why a track reading 174 might genuinely be 87, and why drum and bass at 174 and hip-hop at 87 feel like relatives rather than opposites. If the number looks wrong by a factor of two it almost always is, and the half-time and double-time rows are there so you can read the alternative without tapping again.
Swing is the subtler one. In a shuffle the eighth notes are deliberately uneven, long then short, so tapping them sends the ± figure up even though your timing is fine and the groove is doing exactly what it is supposed to. Tap the quarter-note pulse instead and the spread drops back. The same applies to anything heavily syncopated or built on a pickup: tap what you would count, not what is loudest.
What tapping cannot tell you
It cannot find the downbeat. It measures how fast the beat goes, not where the bar starts, so a reading of 128 says nothing about whether you are tapping on the one. It cannot follow a tempo map either: on a piece that speeds up, the number trails the music by around four beats, because four beats back is the middle of the window it is averaging. And below roughly 24 beats per minute it stops working at all, since a gap that slow exceeds the two-and-a-half-second reset and every tap is treated as a fresh start. Tap the half notes and double the answer.
For an exact figure, stop tapping. Loop one bar in your editor, read its length in milliseconds and put that into the Milliseconds to tempo tab of the BPM calculator, which settles the question to three decimals. A tapped reading of 119.4 is a produced track at 120 telling you it was tapped by a person.
What people use it for
- Getting the tempo of a track that arrived with no metadata
- Setting a metronome or a click to something you are already playing
- Checking whether a live take drifted from the tempo it started at
- Finding the tempo of something you can only hum
- Working out where a DJ has left the pitch fader
Questions
Four gives you something to look at, eight gives you something to trust. The average runs over the last eight gaps, so until you have tapped nine times it is working with less than it wants.
You are almost certainly tapping the hi-hat rather than the beat. Read the half-time row; it is usually the number you meant.
The opposite mistake, and an easy one at fast tempos: tapping every other beat. The double-time row has the answer.
How much your gaps varied around their own average, as a percentage. Under two percent is steady tapping. Above five and the tempo on screen does not deserve a decimal place.
Yes. Space and Enter both register a tap, and space is easier to keep even than a mouse button.
No. There is no microphone and nothing is recorded. It measures the timing of your taps and knows nothing else about the audio.
Because the window keeps moving. Each tap pushes the oldest gap out of the average, so the reading follows a tempo that drifts instead of anchoring to how you started.
After two and a half seconds without a tap. The reading is marked paused, and the next tap begins a new measurement rather than counting the pause as a beat.
Not below about 24 BPM. A beat slower than that leaves a gap longer than the reset, so every tap starts over. Tap the half notes and double the reading.
For anything produced on a grid, yes: software tempos are almost always whole numbers, so 119.4 means 120. A live recording genuinely is not round, and rounding one throws the answer away.
Accurate enough to name a tempo, not to master to one. The clock behind it is good to well under a millisecond, but the input is a human finger, so the honest figure is whatever the ± reading says.
It follows the change but lags it, since the number averages the last eight beats. Expect the reading to trail the music by about four beats.
Delay and reverb. Once you have the tempo, the quarter, eighth, dotted and triplet lengths are what you dial into a plugin or a pedal.
No. It measures how fast the beat goes, not where the bar starts, so nothing here knows whether you are tapping on the one.
No. Nothing is stored, so a reload clears it. Copy the number out before you leave.
Loop one bar in your editor, read its length in milliseconds and put it into the Milliseconds to tempo tab on the BPM calculator. A measured loop beats a tapped one every time.