Free BMI calculator for adults, children and teens: WHO category, BMI Prime and healthy weight range, plus the CDC BMI-for-age percentile for ages 2–19. No sign-up.
Calculate your Body Mass Index (BMI), healthy weight range and WHO category in metric or imperial units. Add an age from 2 to 19 for the CDC BMI-for-age percentile.
Add an age from 2 to 19 to see the BMI-for-age percentile for a child or teen. From age 20, the adult WHO categories apply at every age. BMI does not measure body fat directly.
Optimal body weight associated with lowest health risks. Maintain your healthy lifestyle with balanced nutrition and regular physical activity.
Your weight is within the healthy range.
Contextual analysis of muscle vs fat composition and realistic weekly timeline to reach optimal weight.
Calculate your BMI instantly with metric or imperial units, and include age, height, weight, and gender for an age‑adjusted result. Our free, zero‑latency tool runs entirely in your browser—no sign‑up, no data storage—so you can quickly get the WHO adult BMI categories, a BMI age chart, and a healthy weight range tailored to your age and gender.
| Feature | Smart Toolverse | Others |
|---|---|---|
| Unit Flexibility | Seamless Metric (kg/cm) and Imperial (lbs/ft/in) toggles | Metric-only or separate clunky converters |
| WHO Categorization | Clear classification (Underweight, Normal, Overweight, Obese) | Displays raw number without context |
| Ideal Weight Target | Calculates recommended healthy weight range for your height | Missing ideal weight guidance |
| Health Privacy | Calculated in your browser; only your BMI result is sent if you ask for AI advice | Stores biometric data for marketing |
Fitness coaches use the age‑adjusted BMI calculator to set realistic weight goals for clients of any age, while researchers apply the WHO categories for population health studies that factor in age and gender. Developers embed the client‑side formula into health apps, publishers link to the interactive calculator for readers seeking quick BMI and age chart insights, and businesses run employee wellness screenings or insurance risk assessments with a privacy‑first, no‑login tool.
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