There are "breathilizer" type hand-held devices which measure your metabolism so you can determine your caloric requirements, how many calories you'll burn, and how to effectively gauge your workouts and nutrition plans according to your body. These are best performed after evey 5 lb change in weight.
Impedence meters are a great source of measuring bodyfat because they take the human error factor out of the equation.
Calipers can be used but are highly subjective, even among professionals.
Infared is done, too, but it isn't all that accurate.
Depending on your age, sex, athletic background, ethnic background, activity level, - the formulas used to determine bodyfat are different.
Go to a personal trainer.
Many gyms and clubs offer free assessments with their membership programs, sometimes they'll run specials. Another option is to "check a club out" and while you're on trial see if you can hook up with a trainer to do your bodyfat comp.
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