BMI Calculator
Check your Body Mass Index and see whether your weight is in the healthy range β for adults, in seconds.
Calculate your BMI
Enter your height and weight.
More ways to track your health
Try these related tools for diet and fitness planning.
Find your daily calorie needs.
βFine-tune your protein, carb and fat targets.
βEstimate body fat percentage.
βHow to check your BMI
Get your result in three simple steps.
Pick metric or imperial units.
Your index appears instantly with its category.
See the healthy weight range for your height.
βοΈHow BMI is calculated
BMI is your weight divided by the square of your height β the standard screening measure used by the WHO and health agencies worldwide.
Imperial: 703 Γ weight(lb) Γ· height(in)Β²
Example: 80 kg at 180 cm β 80 Γ· 1.8Β² = 24.7 β in the healthy range.
| Category | BMI range |
|---|---|
| Underweight | Below 18.5 |
| Healthy weight | 18.5 β 24.9 |
| Overweight | 25 β 29.9 |
| Obese | 30 and above |
BMI can’t tell muscle from fat β a muscular athlete can score “overweight” while being very lean, and it may miss excess fat in people with low muscle. Treat it as a screening tool, not a diagnosis. Waist measurement and body-fat estimates add useful context.
Standard cutoffs are calibrated for adults. They don’t apply directly to children and teens (who use age-based percentiles), pregnant people, the very elderly, or highly muscular builds β a clinician can interpret these cases properly.
Frequently asked questions
A BMI between 18.5 and 24.9 is classified as healthy weight for adults by the WHO. It’s a population-level guide β your doctor can assess what it means for you individually.
Divide your weight in kilograms by your height in meters squared (kg/mΒ²). In imperial units: 703 Γ weight in pounds Γ· height in inches squared.
It’s a useful screening tool but not a full health picture β it doesn’t distinguish muscle from fat or account for age, sex or build. Use it alongside other measures.
A BMI of 30 or above is classified as obese, 25β29.9 as overweight, 18.5β24.9 as healthy, and below 18.5 as underweight.
Multiply 18.5 and 24.9 by your height in meters squared. For example at 180 cm that’s roughly 60β81 kg. The calculator shows your personal range above.
Not with adult cutoffs β children and teens are assessed with age- and sex-based BMI percentiles. Ask your pediatrician for the right chart.
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