the bmi calculator scale that are online acurrate? im a wrestler. last year i weighed about 160 with a body fat in the teens. then i started to lift for football during the summer. then i was out in the fall due to injury gain a few pounds. then they we were certified for wreastling then i had a body fat percent of 22. now i did it online and it say that i am 28 %. i am 5 foot 7 180 pounds and in good shape. are these accurate calculations?