Free BPM Detector for Beats
Find the tempo of any beat or track in a few seconds. BeatTag analyses your audio file directly in your browser, so nothing is uploaded and nothing leaves your device.
No signup • 3 free scans a day • Your audio never leaves your browser
How the BPM detection works
BeatTag looks at how the loudness of your track changes over time and picks out the moments where new sounds hit, mainly kicks and snares. It then measures how regularly those hits repeat and converts the most consistent spacing into beats per minute.
The analysis uses up to 60 seconds of the file, starting a little way in, so a quiet intro does not throw it off. It works on standard WAV, MP3 and FLAC exports and processes them locally using your browser's built-in audio engine.
How to get the most accurate result
Use an export with clear drums. Beats with a steady kick and snare give the cleanest result; ambient intros, heavily swung patterns or tempo changes make any detector less certain.
Treat the result as a strong estimate and check it against your DAW project tempo when you have it. If the number is off by a small amount, use the -1 and +1 buttons. If it is exactly half or double what you expected, use the half and double buttons.
Half-time and double-time: why 70 and 140 are both right
Many genres can be counted at two speeds. A trap or drill beat written at 140 BPM is often felt as 70 BPM because the snare lands every two beats. Neither is wrong, but listeners, YouTube searches and sample libraries usually use one convention per genre.
Common ranges, as a rough guide: boom bap around 85-95 BPM, lo-fi around 70-90, afrobeats around 95-115, amapiano around 110-115, UK drill around 140, and trap anywhere from the 130s to the 170s. Pick the convention your target audience searches for.
Limits you should know about
Tempo detection is an estimate, not a measurement of your project file. It can struggle with live-played recordings that drift, songs with tempo changes, and tracks that start with long stretches of silence or sustained pads without drums.
For release-critical work, such as syncing stems or setting a delay time, rely on the tempo in your DAW.
Frequently asked questions
Is the BPM detector really free?
Yes. You can scan three beats per day for free with no signup. BeatTag Pro removes the daily limit if you tag beats in bulk.
Is my audio uploaded to a server?
No. The file is decoded and analysed inside your browser on your own device. It is never sent to BeatTag or to any third party.
Which file formats work?
WAV, MP3 and FLAC exports work in current browsers. If a file cannot be read, try exporting it again as WAV or MP3.
Why does my BPM come out as half or double?
Half-time and double-time are both valid ways to count the same groove. Use the half and double buttons next to the result to switch to the convention your genre uses.
Does it work on my phone?
Yes. BeatTag runs in mobile Safari and Chrome. Analysing a typical beat takes a few seconds on a modern phone.
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