Are my taps uploaded?

No. The tool doesn't use the microphone — it only uses tap timestamps (performance.now) and never sends data to a server.

Why the median instead of the average?

An average swings wildly on a single missed or early tap; the median is robust to outliers and matches human tapping. Stability is reported as IQR (interquartile range) divided by the median, so it widens when your tapping is uneven.

How many taps before BPM locks in?

The 5th tap locks the initial BPM, and after that it keeps updating from the median of the last 16 taps (15 intervals). The longer you tap, the more stable the reading.

iOS and some browsers don't allow AudioContext to start without a user gesture. The metronome here starts on the first tap after you've toggled it on. If it still won't play, check the silent switch and your volume.

Space bar doesn't tap

If another input on the page has focus, the browser captures the space bar. Click the tap button or an empty area to return focus to this tool.

What happens if I stop tapping?

After a 2-second gap the displayed BPM remains, but the next tap starts a fresh interval history. Press Reset if you want to start measuring from zero manually.

How does this pair with midi-info?

Use midi-info to read the BPM declared in a MIDI file's tempo events, then use this tool to measure your felt BPM by ear. The two numbers help you compare the score with how the song actually feels.

Back to Audio

BPM tap — measure tempo by tapping along

Tap a button (or press space) along with a song and the tool computes BPM from the recent inter-tap intervals using the median. Outlier-resistant median + IQR-based stability, up to 16 recent taps, with reset / history clear. Optional Web Audio metronome plays in sync with the detected BPM. All processing runs in your browser.

audiotempo

How to use

Play the song (or imagine the rhythm) and tap the large button along with the beat. You can also press the space bar to tap. From the 2nd tap onward the tool measures intervals; at the 5th tap it locks in a BPM (beats per minute) reading. BPM is computed from the **median** of the last 16 tap intervals, so the occasional missed or early tap won't throw it off. Turn on the metronome to hear short ticks synchronised to the detected BPM (Web Audio, off by default). After a 2-second pause the tool treats the next tap as the start of a new session; press Reset to clear the history manually.

FAQ

Are my taps uploaded?: No. The tool doesn't use the microphone — it only uses tap timestamps (performance.now) and never sends data to a server.
Why the median instead of the average?: An average swings wildly on a single missed or early tap; the median is robust to outliers and matches human tapping. Stability is reported as IQR (interquartile range) divided by the median, so it widens when your tapping is uneven.
How many taps before BPM locks in?: The 5th tap locks the initial BPM, and after that it keeps updating from the median of the last 16 taps (15 intervals). The longer you tap, the more stable the reading.
Metronome won't play: iOS and some browsers don't allow AudioContext to start without a user gesture. The metronome here starts on the first tap after you've toggled it on. If it still won't play, check the silent switch and your volume.
Space bar doesn't tap: If another input on the page has focus, the browser captures the space bar. Click the tap button or an empty area to return focus to this tool.
What happens if I stop tapping?: After a 2-second gap the displayed BPM remains, but the next tap starts a fresh interval history. Press Reset if you want to start measuring from zero manually.
How does this pair with midi-info?: Use midi-info to read the BPM declared in a MIDI file's tempo events, then use this tool to measure your felt BPM by ear. The two numbers help you compare the score with how the song actually feels.

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