Key & BPM Finder

How to Find the Key and BPM of a Song

Whether you're prepping a DJ set, matching a beat to an acapella, practicing along to a track, or syncing visuals to music, you need two numbers: the tempo in beats per minute and the musical key. This free key and BPM finder measures both directly from the audio — no upload, no account, no waiting in a queue.

How It Works

How Accurate Is It?

Tempo detection is very reliable on modern, steadily-produced music — electronic, hip-hop, pop, and most rock lock in within a fraction of a BPM. The classic pitfall of any BPM detector is the octave error: hearing a 70 BPM track as 140 or vice versa. That's why the result always shows the half-time/double-time alternative — if the number feels wrong, it's almost always that one.

Key detection compares the track's harmonic content against known key profiles. It's most confident on harmonically stable tracks and shows you its second-best guess too — often the relative major/minor, which shares the same notes and mixes perfectly anyway.

What Is BPM?

BPM (beats per minute) is the tempo of a song — how many beats occur in sixty seconds. A 120 BPM track has exactly two beats per second. DJs use BPM to beatmatch, producers use it to set their project tempo before sampling or remixing, and video editors use it to cut footage on the beat.

What Is a Song Key — and the Camelot Wheel?

The key of a song is the tonal center all its melodies and chords resolve to — for example A Minor or F♯ Major. Two tracks in the same or closely related keys blend harmonically; tracks in clashing keys sound dissonant when layered.

The Camelot wheel maps all 24 keys onto a clock face — numbers 1–12, with 'A' for minor keys and 'B' for major. It exists so you don't need music theory: from any code, mixing into the same number, one number up or down, or the same number with the other letter always sounds good. That's why every result here includes the Camelot code.

Harmonic Mixing: How DJs Use Key and BPM

Harmonic mixing means choosing the next track so its key is compatible with the current one. With each track's Camelot code, the rules are mechanical:

• Same code (e.g. 8A → 8A): perfect blend, zero risk.
• One step up or down (8A → 7A or 9A): smooth energy shift, the classic transition.
• Same number, other letter (8A → 8B): switch between relative minor and major — instant mood change that stays in tune.
• ±1 with letter swap (8A → 9B): the 'energy boost' — advanced but powerful.

Analyze a few tracks in a row above and the table keeps them all, so you can sketch a harmonic set order in one sitting.

Frequently Asked Questions