BPM Detector

What it does

BPM Detector estimates the tempo of a song in beats per minute using onset strength and autocorrelation on the energy envelope. You can also ignore the file and use Tap tempo — hit the TAP button in time with the music you hear.

Results include a primary BPM, an optional confidence label, and half-time / double-time controls when the algorithm locks onto a subdivision instead of the pulse you expect. Analysis stays in your browser; nothing is uploaded for processing.

Best results come from a clear rhythmic section — a chorus, verse, or drum loop — rather than a quiet intro or ambient noise. Live jazz, rubato classical, and heavy crowd noise are harder; treat the number as a guide and use tap mode when the automatic estimate drifts.

BPM (beats per minute) is the standard way producers, DJs, and musicians describe tempo. A ballad might sit around 60–80 BPM, a typical pop chorus around 100–120, and many dance or electronic tracks push past 128. Knowing the number helps you match tracks in a set, time effects, practice with a metronome, or line up samples with a project tempo.

Besides the main BPM reading, the tool shows a confidence score, a short “feel” tag, delay/note values (1/1, 1/2, 1/4, 1/8) useful for delay and LFO settings, and a simple genre-range map so you can see where the estimate sits. A built-in metronome lets you hear the detected pulse immediately. When key detection is available on the same clip, the estimated key appears next to the tempo for a quick musical overview.

This tool is part of the Music Identifier toolkit on song-identify.com — free browser-based audio utilities that keep your files local.

After you know the tempo, try the Key Detector or Speed & Pitch to match another track.

How to use it