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AI RAP MAKER
Create a song

Tempo & Key Finder

Drop in a beat to estimate its BPM and musical key, or tap along to count the tempo. The audio is analysed on your device and never uploaded.

Analyse a beat

Choose an audio file

MP3, WAV, M4A or anything your browser can play. Up to 60 MB.

Or tap the tempo

Tap along to the kick or snare for a few bars.

Result

Estimates, not lab measurements.

Tempo and key show up here after you choose a file.

How to find the BPM and key of a beat

  1. Choose the beat

    Pick an audio file. The tool reads up to 90 seconds from the middle, where the groove is steadiest.

  2. Read the estimate

    You get the tempo with its half or double time reading, and the most likely key with a runner-up.

  3. Check by ear

    Tap along to confirm the tempo, and hum the root note over the beat to confirm the key.

Use the numbers to write and match

Tempo and key help you pick a flow and line up a hook.

  • Trap and drill often sit around 130–150 BPM, counted at half time as 65–75.
  • Boom bap usually lives around 85–95 BPM, a comfortable tempo for dense bars.
  • Minor keys feel darker; if the estimate says minor, a sung hook in that key will blend in.
  • Beats with few melodic notes give rough key guesses. Trust your ear when the label says so.

Other ways to get from an idea to a finished track.

All tools

Tempo & Key Finder FAQ

No. Your browser decodes and analyses the file on your device. Nothing is sent to a server and no account is needed.

Need a beat to measure?

Generate an instrumental rap beat, then check its tempo and key here.

Make a beat