Bpm?

tap tempo or beat detector are the usual suspects for this

alternatively you can work with stop watch and audio editor to know the time of 1 beat and then do some quick numbers

1 beat = X seconds (partial or full)

there are 60 seconds in a minute, so bpm will be equal to 60/X

e.g.
1) if 1 beat = 0.66 seconds then the bmp = 60/0.66 = 90.9 bpm

2) if 1 beat = 0.87 seconds then the bmp = 60/0.87 = 68.9 bpm

3) if 1 beat = 0.56 seconds then the bmp = 60/0.56 = 107.1 bpm
 
Ideally you should start out by timing the source material to accurately determine it's BPM, You can use tap-tempo or a stopwatch and you want to avoid trying to determine the BPM or length by nudging loop points around because you are essentially setting your own point of reference instead of referencing the unrestrained source material in a way which is actually more intuitive and natural.

When you start off on the right foot everything becomes so much easier, I mean once you understand the relationship between BPM and loop length it opens a door to better sampling.....you should be able to look at the length of your sample and figure out the BPM if you cut it right, but if you are just hacking away your best bet will be to use tap-tempo because you don't have any clue where you're at.
 
Hey,
Until you get familliar with tapping i think you can have a general idea about the bpm of an audio track with a freeware called mixmeister bpm analyzer
Good luck !
 
If the track has a clear cut drumline that follows a perfect metronome you could download Serato for free and just analyze the beat and get an idea of what the bpm might be. You have to first know what range the bpm, like is it closer to 120 or 60, before doing this method.

If it's one of those old school or live joints just follow the info from the other posters. All solid.

Cheers!
 
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