Weight and body measurements can provide useful starting points for understanding body size, body composition, and weight-related goals. This collection brings together calculators that use measurements such as height, weight, waist circumference, hip circumference, and body-fat estimates to produce practical screening and planning information.
No single measurement gives a complete picture of health. BMI, for example, is widely used as a screening measure but does not directly measure body fat or distinguish fat mass from muscle mass. Waist-based ratios can add information about body-fat distribution, while body-fat and lean-mass estimates provide a different view of body composition. Used together, these tools can help you understand your measurements from several angles rather than relying on one number.
Choose the calculator that best matches your question. You can estimate BMI, explore a reference weight range, estimate body-fat or lean body mass, or compare waist measurements with height and hip circumference. Results are intended for general educational and planning purposes and should be interpreted alongside individual health circumstances.
Find a Calculator
Search all 50 Weight Loss Tools calculators by name, topic or goal.
Popular Weight & Body Calculators
BMI Calculator
Estimate Body Mass Index from height and weight.
Open calculatorBody Fat Calculator
Estimate body-fat percentage from circumference measurements using the U.S. Navy method.
Open calculatorIdeal Weight Calculator
Estimate a reference body weight using several commonly cited height-based formulas.
Open calculatorAll Weight & Body Calculators
BMI Calculator
Estimate Body Mass Index from height and weight.
Open calculatorIdeal Weight Calculator
Estimate a reference body weight using several commonly cited height-based formulas.
Open calculatorHealthy Weight Range Calculator
Estimate the body-weight range corresponding to adult BMI 18.5–24.9 for your height.
Open calculatorBody Fat Calculator
Estimate body-fat percentage from circumference measurements using the U.S. Navy method.
Open calculatorLean Body Mass Calculator
Estimate fat-free body mass from height, weight and sex.
Open calculatorWaist-to-Height Ratio Calculator
Calculate waist circumference divided by height.
Open calculatorWaist-to-Hip Ratio Calculator
Calculate waist circumference divided by hip circumference.
Open calculatorWhich Calculator Should I Use?
Want a quick height-and-weight screening measure?
Want an estimate of body-fat percentage?
Want a reference weight based on height?
Want to assess waist size relative to height?
How These Calculators Work Together
Start with BMI or Healthy Weight Range for a broad screening view, then use Body Fat or Lean Body Mass for body-composition context. Waist-to-Height and Waist-to-Hip ratios can add information about body-fat distribution. The tools complement one another; they are not interchangeable diagnoses.
Frequently Asked Questions
Which weight and body calculator should I use first?
BMI is a simple starting point because it needs only height and weight. If you want more context, follow it with a body-fat, lean-body-mass, or waist-ratio calculator.
Are these calculators medical tests?
No. They provide estimates or screening measures for general information and planning. They do not diagnose a medical condition.
Why can BMI and body-fat results tell different stories?
BMI is based on height and weight, while body-fat estimates attempt to describe body composition. A person with high muscle mass can therefore have a higher BMI without having a correspondingly high body-fat percentage.
Should I use Metric or US units?
Use whichever system is most convenient. The calculators support both and normalize values internally before calculating.
Can I use several calculators together?
Yes. Combining BMI, body-fat, lean-mass, and waist-based measures can provide more context than relying on one measurement alone.