BPM & Key Finder — Find the Tempo and Key of Any Song Free
Song analyzer

BPM & Key Finder

Upload any song to instantly detect its tempo, musical key and Camelot number. Free, private and unlimited.

100% free No signup Runs in your browser

Analyzing tempo and key…

Your file never leaves your device. Analysis runs in your browser.

Tempo
-- BPM
Key
--
· Camelot
Confidence:
Relative key
--
Camelot
Mixes well with:

Play the track and tap along to double-check the tempo by ear.

AnyToSpeech AI Music Studio
AnyToSpeech

Make a new track at this tempo and key

Send the BPM and key to Music Studio and generate an original instrumental that fits your mix.

  • Full songs from a text idea, your own lyrics, or instrumental beds.
  • Two versions every generate so you can pick the better take.
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How it works

Upload a song

Drop in an MP3, WAV, M4A or FLAC file. Nothing is uploaded — it stays on your device.

Get BPM and key

We detect beats and harmonic content to calculate tempo, key, scale and Camelot code.

Mix or make music

Use the results for DJ mixing, remixes or to generate a new beat at the same tempo and key.

Find the BPM and key of any song in seconds

Knowing the tempo and key of a track is essential for DJs, producers, singers and cover artists. This free tool measures beats per minute by tracking rhythmic onsets, and estimates the key by comparing the song's pitch profile against all 24 major and minor keys.

Results include the Camelot wheel number used for harmonic mixing, the relative key and the neighbouring keys that blend smoothly. If the tempo looks doubled or halved, switch between half-time and double-time with one click.

More free music tools

BPM Finder Get the beats per minute of any audio file. Key Finder Find the musical key and Camelot code of any song. Tap Tempo Tap along to find BPM, plus a BPM-to-ms chart.
See all music tools

Frequently asked questions

How accurate is the BPM and key detection?

For most pop, hip-hop, electronic and rock songs with a steady beat the BPM is accurate to within 1 BPM. Key detection is reliable for tonal music; songs that modulate or use unusual harmony may show a medium or low confidence with alternative keys.

Why does it show half or double the tempo I expected?

Tempo is ambiguous by nature — a 70 BPM ballad and a 140 BPM trap beat can share the same pulse. Use the Half and Double buttons to pick the reading that matches how you count the song.

What is the Camelot number?

The Camelot wheel assigns each key a number and letter (for example 8A for A minor). Keys with the same number, or one step away, mix together harmonically — that is what DJs use for smooth transitions.

Is my song uploaded anywhere?

No. The audio is decoded and analyzed entirely in your browser with the Web Audio API. Your file never leaves your device.