Song key and BPM finder
Drop in a song to get its key, tempo, and Camelot code. It's free, needs no signup, and the file stays on your device.
Camelot key chart
Each code maps to one minor and one major key. Moving one number up or down, or switching between A and B on the same number, keeps a mix in compatible keys.
| Number | Minor (A) | Major (B) |
|---|---|---|
| 1 | G# minor | B major |
| 2 | Eb minor | F# major |
| 3 | Bb minor | Db major |
| 4 | F minor | Ab major |
| 5 | C minor | Eb major |
| 6 | G minor | Bb major |
| 7 | D minor | F major |
| 8 | A minor | C major |
| 9 | E minor | G major |
| 10 | B minor | D major |
| 11 | F# minor | A major |
| 12 | C# minor | E major |
Features
Key and scale
Reads the notes across the whole track and returns the most likely key, plus the next closest match.
Tempo in BPM
Measures where the beats land and gives one tempo, with the half-time and double-time readings next to it.
Camelot code
Each result includes the Camelot code and the keys that mix cleanly with it, for harmonic DJ sets.
Stays on your device
The analysis runs in your browser. Nothing is uploaded, so you can use it on unreleased tracks.
Common audio files
Works with MP3, WAV, M4A, FLAC, and OGG, depending on what your browser can play.
Free with no limit
No account, and no cap on how many songs you check.
How it works
How to find the key of a song
Drop a song into the box above, or click it to choose a file.
Your browser decodes the audio and measures its pitch and rhythm.
Read the key, BPM, and Camelot code, then copy them or make a loop to match.
Ready to try it?
Make a loop freeNext steps
Built for release-ready workflows
Use cases
Who uses this
Sampling
Find the key and tempo of a sample before you pitch it or chop it into a beat.
DJ sets
Use the Camelot code to plan transitions between tracks that share compatible keys.
Remixes
Set your session key and tempo to match the original before you add new parts.
Writing to a beat
Check the key of an instrumental before you write a topline or record vocals over it.
Related tools
Related tools
FAQ
Key and BPM Finder FAQ
How do I find the key of a song?
Drop the audio file into the finder at the top of this page. It reads the notes across the track and shows the most likely key along with the next closest match. To check by ear, play along on a piano and find the note the song keeps resolving to.
How do I find the BPM of a song?
Add the file to the finder and it reports the tempo with the key. If you do not have the file, play the song and use the BPM tap tool to tap along with the beat.
How accurate is the key and BPM finder?
Treat the result as a strong starting point. Songs that change key, stay on one chord, or have no clear tonal center are the hardest to read. Tempo is most reliable on full tracks with drums, and short loops without drums can read wrong. Check the key against a piano or your DAW before you commit to it.
Why does it show a second key?
Some keys share most of their notes. A minor and C major use exactly the same notes, so a song can fit both. The finder shows the next closest match so you can decide which one fits what you hear.
Why is the BPM half or double what I expected?
A 140 BPM trap beat can also be counted as 70 BPM in half-time, and both describe the same groove. The finder shows the half and double readings so you can use whichever matches how you count the track.
What is a Camelot code?
The Camelot wheel gives each key a number from 1 to 12 and a letter, A for minor and B for major. Tracks with the same code, a code one number away, or the same number with the other letter usually mix cleanly.
Is my song uploaded anywhere?
No. The audio is decoded and analyzed in your browser, and the file is not sent to Sonura or anyone else.
Is the key finder free?
Yes. You do not need an account, and there is no limit on how many songs you can check.
Make a loop in your key
Free to start. No credit card required.