ride the boat
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You can either calculate it by your BMI, which is weight (KG) / height (m)^2, or you can do your waist to hip ratio, which is considered more accurate. Thats measured by waist/hip. For a better explanation, go to http://www.weightlossresources.co.uk/body_weight/body_fat/too_fat.htm
Scroll about 2/3 down. There ya go!