Weight & Body Composition Calculators
These calculators look at body size and composition, starting with BMI and a healthy weight range for your height. Each one shows its formula, a worked example and the sources behind the categories.
- BMI CalculatorEnter your height and weight to see your body mass index, its adult category and the healthy weight range for your height.
- Body Fat Percentage CalculatorEstimate your body fat percentage with the US Navy tape-measure method and see which category it falls in, plus your fat and lean mass.
- Ideal Weight CalculatorSee the healthy BMI range for your height alongside the Devine, Robinson, Miller and Hamwi ideal-weight formulas.
How these calculators work
Every calculator in this group names its formula, shows a worked example and lists the sources behind its categories. The numbers are estimates based on the details you enter, so they work best as a starting point for a conversation with a doctor, dietitian or trainer rather than as a final answer.
Results are for information only and are not medical advice. See our editorial policy and methodology for how we choose and review formulas.