Use a BPM analyzer app or website
Tap along with the beat using a tap tempo tool
Count the beats for 15 seconds and multiply by 4
Count the beats for 30 seconds and multiply by 2
Use DJ software or DAW tempo detection
Check the song’s metadata or file tags
Search the song online for its listed BPM
Match the song to a metronome until the tempos align
Identify the downbeat and count steady beats per minute
Use a music production plugin with tempo detection