Zokilos
Zokilos
Adult BMI for men & women, plus a CDC percentile calculator for kids & teens
Body Mass Index (BMI) is weight divided by height squared. It's a quick screening number, not a direct measurement of body fat, but it correlates well enough with body fat at a population level that it's the standard first check used by doctors and public health guidelines worldwide.
Choose Adult or Kid/Teen mode, and metric or imperial units.
Enter sex, age, height, and weight.
Your BMI, category, and extra stats update instantly.
The BMI formula and the standard WHO adult categories (underweight, normal, overweight, obese) are identical for men and women — there's no separate male/female BMI scale. Sex matters for the bonus estimated body fat percentage on this page, since men and women store body fat differently at the same BMI, and it's required for the kids/teens percentile lookup, since boys' and girls' growth charts differ.
Children are still growing, so a fixed BMI scale doesn't make sense — a healthy BMI at age 4 is very different from a healthy BMI at age 14. Instead, this mode uses the official CDC BMI-for-age growth chart data (LMS parameters by exact age in months and sex) to work out exactly where a child's BMI falls on the distribution for kids their age and sex, expressed as a percentile.
Adult categories follow the WHO/CDC standard thresholds. The estimated body fat % uses the Deurenberg et al. (1991) formula from BMI, age, and sex. The kids/teens percentile uses the CDC's own published BMI-for-age LMS reference data (2000 growth charts, ages 2–20) — the same underlying data pediatricians' growth chart software uses.
A quick first check before a doctor's visit or health assessment.
See where a kid's BMI sits on the same percentile scale pediatricians use.
Check the healthy weight range for your height before setting a target.
The BMI formula and the standard WHO weight categories are the same for adult men and women. Sex only changes the bonus estimated body fat percentage on this page, since men and women carry body fat differently at the same BMI.
Children's and teens' healthy body fat changes constantly as they grow, so a fixed adult scale doesn't work. Instead, their BMI is compared to a CDC growth-chart percentile for their exact age and sex — the same method pediatricians use.
2 to 20 years, matching the official CDC BMI-for-age growth charts. For a child under 2, BMI-for-age isn't used at all — ask a pediatrician.
Underweight is below the 5th percentile, healthy weight is 5th up to the 85th, overweight is 85th up to the 95th, and obesity is the 95th percentile and above — these are the official CDC screening cutoffs.
No, it's a screening tool, not a diagnosis. BMI doesn't distinguish muscle from fat, so very muscular people can show as "overweight", and it doesn't account for where fat is carried on the body.
No. Nothing is saved or sent anywhere — everything runs in your browser and clears when you refresh or close the page.