how can i calculate percentage of body fat i have on my body?

i've seen many bodybuilders discussing that in forums that they had this percent of fat sum months ago and now they've reduced to this percent.. how r they so sure about tht? is there any procedure or any tests to calculate percentage of bodyfat?

Public Comments

1. You can use any website with a simple BMI calculator just google it.(the higher ur BMI the higher ur body fat to height ratio;the sites should explain)
2. Simple blood workups can give these results.
3. Skin fold calipers (not very accurate) or get a special scale that will use electricity (it doesn't hurt) to find out at least somewhat accurately your pecentage body fat.
4. The cheapest and easiet way is to use hand-held calipers, see it and other body fat measuring devices here: