To find the BPM and key of a song, load it into an analyzer, then check both by ear: play the track with a click on the detected beat, and play the suggested key note against the song. The two classic errors are a tempo that is half or double the real one and a key confused with its relative major or minor.
In Short
The short version:
- BPM is the number of beats per minute; the key is the set of notes a song is built on.
- The fastest method is an analyzer that reads both from the file.
- Tapping the beat gives the tempo of any music you can hear.
- Check the tempo with a click and the key with a played note.
- Half or double tempo and relative major or minor are the usual mistakes.
What BPM and Key Tell You
BPM, beats per minute, is the tempo: how many beats pass in one minute. At 60 BPM there is one beat per second, at 120 BPM two. The key is the set of notes a song is built on, named after its home note and its mode, for example A minor or C major. A melody or a bass line from a song in A minor fits other music in A minor, and usually sounds wrong against music in an unrelated key.
You need the two values whenever you combine recordings: to line up the beats of two tracks in a DJ mix, to fit a sample or an a cappella to a project, to set the project tempo before recording to a click, or simply to learn a song on an instrument.
| Style | Typical tempo (BPM) |
|---|---|
| Hip-hop | 80–100 |
| Pop | 100–130 |
| House | 118–128 |
| Techno | 125–140 |
| Dubstep | about 140 (often felt at 70) |
| Drum and bass | 165–180 |
These are typical ranges that help you judge whether a result is plausible. Individual tracks fall outside them.
Three Ways to Find Them
1. Analyze the File
The quickest way is to let software measure both. Open the track in the BPM & Key Analyzer: it shows the tempo, the key with its Camelot code, a second key candidate and a confidence rating for each. The file is analyzed in your browser and is not uploaded.
2. Tap the Tempo
If you do not have the file, or the music has no steady drum beat, tap along. Play the song from any source and tap the space bar on every beat in the BPM Tapper. After 8 to 16 taps the average is usually within 1 BPM. Tapping is also the best second opinion on an automatic result.
3. Find the Key by Ear
Hum the note on which the song feels at rest, usually the last note of the chorus or the note the bass keeps returning to. Find that note on a keyboard, or play tones in the Frequency to Note Converter until one matches. That note is the tonic. If the song sounds bright and settled, the key is most likely major; if it sounds darker, minor. This takes practice, but it is how musicians have always done it.
How to Check the Result
An analysis is an estimate, so check it before you rely on it.
- Tempo: switch on the click in the analyzer and play the track. If the clicks stay on the beat from the first bar to the last, the tempo is right. If they slowly drift, it is slightly off; if they fall between the beats, tap the tempo instead.
- Half or double: a result of 87 for a drum and bass track, or 140 for a slow hip-hop beat, is the same pulse counted differently. Compare it with the typical range of the style and take the half or double value shown next to it.
- Key: play the home note of the suggested key over the song. It should sound like a resting point. If it does not, try the second suggestion.
- Relative major and minor: C major and A minor use exactly the same notes, as every pair of relative keys does , so software confuses them easily. For harmonic mixing it does not matter, because both have the same Camelot number.
- Songs without a fixed tempo: live recordings speed up and slow down. Their BPM is an average, and a click will not stay with them for long.
What to Do with the Numbers
To match two tracks, the tempos must be close and the keys compatible. A tempo difference of a few percent is easy to close: to bring a 120 BPM track to 126, speed it up by 5 percent (126 ÷ 120 = 1.05) in the Pitch & Speed Changer, which changes the speed without changing the pitch. To move a track into another key, shift it by semitones in the same tool; each step on the Pitch slider is one semitone.
Which keys go together is shown on the Camelot Wheel: the same code, the neighboring numbers and the other letter on the same number. How to build a whole set from there is the subject of How to Pick Songs Like a Pro DJ. If you publish mixes or mashups, use only music you have the rights to; matching two commercial songs does not make the result yours.
Find the BPM and Key of Your Track
Open a file to see its tempo, key and Camelot code, and check the beat with a click.
Open the BPM & Key AnalyzerFree, no sign-up, and your files never leave your device.