What is a healthy BMI range?

For most adults, a BMI between 18.5 and 24.9 is considered a healthy weight range. Below 18.5 is classified as underweight, 25 to 29.9 as overweight, and 30 or above as obese.

Is BMI accurate for athletes or very muscular people?

BMI does not distinguish between muscle and fat mass, so it can overestimate body fat in muscular or athletic individuals and underestimate it in people with low muscle mass. It should be used as a general screening tool, not a diagnostic measurement.

How is BMI calculated for children and teens?

For children and teens aged 2 to 20, BMI is calculated the same way as for adults, but the result is compared to CDC growth chart data for the child's age and sex to determine a percentile, rather than using fixed adult cutoff points.

What is BMR and how is it used?

BMR (Basal Metabolic Rate) is the number of calories your body needs at complete rest to maintain basic functions. Multiplying BMR by an activity factor estimates your total daily calorie needs.

BMI Calculator – Adult & Child BMI, Healthy Weight, BMR & Calories

BMI Calculator

Calculate Body Mass Index for adults or children, plus healthy weight range, BMR & calorie needs.

Sex

Age (years)

Height (cm)

Weight (kg)

Activity Level (for calorie estimate)

Waist (cm)

Hip (cm)

This calculator is for general informational purposes only and does not replace professional medical advice. Consult a qualified healthcare provider for personalized guidance. Child BMI percentiles are based on the CDC 2000 growth reference charts.