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BMI Calculator
Your BMI
22.9
Your BMI
22.9
Category: Normal weight
BMI categories for adults (WHO)
| Classification | BMI range (kg/m²) |
|---|---|
| Severe Thinness | < 16 |
| Moderate Thinness | 16 - 17 |
| Mild Thinness | 17 - 18.5 |
| Normal weight | 18.5 - 25 |
| Overweight | 25 - 30 |
| Obese Class I | 30 - 35 |
| Obese Class II | 35 - 40 |
| Obese Class III | > 40 |
Enter positive numbers. Results are informational only — ask a professional for medical advice.
BMI Calculator Guide (Body Mass Index)
This BMI calculator helps you estimate your Body Mass Index (BMI) using your height and weight. BMI stands for body mass index — a simple ratio that compares body weight to height. Because it is quick to compute and easy to interpret, BMI is commonly used as a screening metric in healthcare, fitness tracking, and public health research.
Your BMI number can indicate whether you are likely to fall into an underweight, normal weight, overweight, or obesity range. This BMI calculator shows both the BMI value and a category label so you can quickly understand your result. It also displays a gauge with color zones to help you visualize where you stand across common BMI ranges.
It is important to treat BMI as a starting point. BMI does not directly measure body fat percentage, and it does not account for where fat is stored, your muscle mass, bone density, or overall body composition. Two people can share the same BMI while having very different health profiles. That said, BMI is still useful for many people as a first estimate of weight status and as a way to track changes over time.
This page includes a BMI chart table for adults (based on World Health Organization ranges), plus extra metrics such as BMI Prime and the Ponderal Index. Those values can make it easier to compare your BMI to reference thresholds and understand how far your BMI is from the upper end of the normal range.
If you are using the BMI calculator for children and teens (roughly ages 2–19), adult BMI categories are not the best tool. For younger ages, health organizations typically recommend BMI-for-age percentiles. This calculator still computes BMI, but you should interpret the result using age- and sex-specific percentile charts rather than adult cutoffs.
If your BMI falls outside the normal range, that does not automatically mean you are unhealthy — and being inside the normal range does not guarantee health. Consider BMI together with other indicators such as waist circumference, activity level, sleep, nutrition, blood pressure, and lab values. If you have concerns, consult a qualified healthcare professional.
For SEO and clarity, we use common terms people search for (BMI calculator, body mass index calculator, BMI chart, healthy weight range) while keeping the content readable. The goal is a practical guide that explains what the BMI result means, how it is calculated, and when it can be misleading.
How to use this BMI calculator
- Choose a unit system (US, Metric, or Other).
- Enter your height and weight (and optionally age and sex).
- Review your BMI value, category, and the healthy BMI range.
- Check the healthy weight range for your height and the BMI Prime value.
BMI formula
In metric units: BMI = weight(kg) / height(m)². In US customary units, BMI is often computed with a conversion factor: BMI = 703 × weight(lb) / height(in)².
How to interpret BMI results
BMI categories are commonly used for adults. A “normal” BMI range is typically 18.5–25. Values above that range are generally classified as overweight or obesity, and values below are classified as underweight. Different health organizations and regions may use slightly different cutoffs.
Limitations of BMI
- BMI does not distinguish fat mass from muscle mass.
- Athletes or very muscular people may have a high BMI without excess body fat.
- Age, sex, and body composition can affect interpretation.
- For children and teens, BMI percentiles are typically preferred over adult BMI ranges.
BMI calculator FAQ
What is a good BMI?
For many adults, a commonly cited “healthy” BMI range is 18.5 to 25. Individual goals can differ based on health history and body composition.
Why is BMI different for athletes?
Muscle is dense. Athletic or very muscular people can have a higher BMI without having excess body fat.
Should I use BMI for children?
For ages 2–19, BMI-for-age percentiles are usually recommended. The BMI number alone is not enough for interpretation.
Can BMI be used to track progress?
Yes. Even with limitations, BMI can be a useful trend metric when measured consistently over time.