how do i find out my body fat%

Yes,there's alot of websites but they're not extremely accurate. The best way to determine your BF% is to get a DEXA scan,or get a bod-pod test done. Those two things are pretty expensive, so another option is to just use body calipers.

unless you have to have a super accurate BF measurement, the online calculators get you in the right ball park. Accumeasure calipers are probably better and about $8-10. I wouldn't go by ANY electronic bioelectric impedance devices like those in bathroom scales. There are notorious for false readings as body fluid among other things can affect the reading.

Hope this helps