Free BMI Calculator (Body Mass Index)
Use our free BMI calculator to estimate your Body Mass Index and see which weight range — underweight, healthy, overweight, or obese — your result falls into.
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- Category
- Healthy weight
A BMI of 24.2 is classified as healthy weight for adults. BMI is one snapshot — body composition, age, and muscle mass also matter.
What is BMI?
Body Mass Index (BMI) is a simple screening number calculated from your height and weight. It estimates whether you are in a healthy weight range relative to your height and is widely used by clinicians, insurers, and public health agencies.
The formula is straightforward: BMI = weight (kg) / height (m)². In imperial units it becomes BMI = 703 × weight (lb) / height (in)².
Healthy BMI Ranges for Adults
- •Below 18.5 — Underweight
- •18.5 to 24.9 — Healthy weight
- •25.0 to 29.9 — Overweight
- •30.0 and above — Obese
Limitations of BMI
BMI does not measure body fat directly. Athletes with high muscle mass can be classified as overweight, while older adults with low muscle mass can be classified as healthy when they actually carry too much body fat.
Use BMI as a starting point alongside other measurements like waist circumference, body fat percentage, blood pressure, and lab work.
Tips for a Healthier Weight
- •Prioritize protein at every meal to preserve muscle.
- •Aim for 7,000 to 10,000 steps per day plus 2-3 strength sessions.
- •Sleep 7-9 hours — short sleep increases hunger hormones.
- •Drink water before meals and limit sugar-sweetened beverages.
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Frequently Asked Questions
Is BMI accurate?
BMI is a useful screening tool but not a diagnosis. It does not distinguish fat from muscle, so very muscular people may have a high BMI without health risks.
What is a good BMI for women?
For most adult women a BMI between 18.5 and 24.9 is considered healthy, the same range used for men.
Should children use this calculator?
No. Children and teens use BMI-for-age percentile charts, not adult BMI categories.
How often should I check my BMI?
Once every few months is enough to spot trends. Daily checks add noise without insight.
Related Calculators
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Estimate body fat percentage using the U.S. Navy circumference method.