BPM Finder
Find the BPM of any song from an audio file or your microphone. Analysis runs entirely in your browser, so nothing is uploaded. Free, no sign-up.
About the BPM finder
This detects a song’s tempo automatically, rather than asking you to tap along. It analyzes the audio’s rhythmic pulses — the pattern of sudden loudness spikes a kick drum, snare, or strummed chord produces — and works out how often they repeat to arrive at a beats-per-minute figure, plus a confidence score for how sure it is.
How to use it
- Choose Microphone to analyze whatever’s playing nearby, or Upload File for a track you already have.
- With the microphone, start listening and let ten to fifteen seconds of the song play before expecting a stable reading.
- With a file, pick it and wait a moment while it decodes and analyzes — no need to play it out loud first.
Tips for a reliable result
- A clear, steady beat (drums, a driving bassline, a strummed rhythm) gives a much stronger reading than sparse or ambient music.
- Longer clips help — a few seconds of one drum fill can throw off a very short sample.
- If the number looks exactly half or double what you’d expect, that’s a known ambiguity (a song “in 128” can just as validly be counted as 64) — the secondary number shown next to it is usually the other candidate.
FAQ
Why does it show two BPM numbers?
Tempo detection can’t always tell a beat from its double or half-time counterpart from rhythm alone — both describe the same music correctly. The main number is the best guess; the smaller one next to it is the other likely reading.
Does my audio get uploaded anywhere?
No. Whether it’s your microphone or a file you choose, the analysis runs entirely in your browser — nothing is sent to a server. See the Privacy Policy for details.
What file types can I upload?
Anything your browser can decode as audio — MP3, WAV, M4A, and most other common formats.
Can I find the BPM without audio?
Yes — if you can hear the song in your head or on another device, the Tap Tempo counter works out the BPM from your taps.
This also shows a key — is that the same tool as Key Finder?
Yes — BPM Finder and the Key Finder run the same analysis on the same audio; each page just leads with a different result.