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Free BMI Calculator
Check your Body Mass Index instantly. Enter your height and weight to find out if you're in a healthy BMI range.
Understanding BMI
What Is BMI?
BMI stands for Body Mass Index. It is a simple screening measure that uses your height and weight to estimate whether you fall into a standard adult weight category.
Healthcare professionals often use BMI as a quick reference point for identifying possible weight-related health risks.
How BMI Is Calculated?
Your BMI range is calculated from your weight and height.
- U.S. formula: BMI = weight (lb) / height (in²) × 703
- Metric formula: BMI = weight (kg) / height (m²)
For example, if you weigh 154 lb and are 5'9" tall, your BMI is about 22.7.
Adult BMI Categories
This calculator uses standard adult BMI ranges to estimate your general weight category.
| BMI Category | BMI Range |
|---|---|
| Underweight | Below 18.5 |
| Normal | 18.5 to 24.9 |
| Overweight | 25.0 to 29.9 |
| Obese | 30.0 and above |
Use the BMI chart below to estimate your BMI based on your height and weight. Find your height on the left, then match it with your weight along the bottom. The number where they meet is your estimated BMI.
These categories are general reference ranges for adults and are used for screening purposes only. BMI does not directly measure body fat or overall health.
What BMI Can Tell You
BMI can give you a quick snapshot of your general weight status. It may help show whether your weight falls in a BMI range associated with lower or higher weight-related health risks.
It can also be useful for tracking broad weight trends over time, especially when combined with nutrition, activity, and lifestyle goals.
What BMI Cannot Tell You
A BMI calculator or BMI chart does not directly measure body fat percentage, muscle mass, bone density, or where fat is stored on your body.
Because of this, people with the same BMI can have very different body composition and health profiles. Athletes, older adults, and people with higher muscle mass may need additional measurements for a more accurate picture.
Use BMI as a starting point, not a diagnosis. For personalized guidance, consider your waist circumference, activity level, diet quality, sleep, medical history, and advice from a healthcare professional.
FAQ
For a fuller view, the BMI calculator's results should be considered with other indicators such as waist circumference, activity level, and medical history.
However, body composition can differ, so the same BMI may not reflect the same health profile in every individual.
Factors like blood pressure, blood sugar, cholesterol, fitness level, sleep, and diet quality also matter.Additionally, muscular individuals and athletes may have a higher BMI due to their higher level of muscle mass.
For children and teens, BMI should be interpreted with BMI-for-age growth charts under professional guidance.
Formula: BMI = weight (kg) ÷ height² (m²)
For most adult women, a BMI between 18.5 and 24.9 is generally considered within the healthy weight range.
For most adult men, a BMI between 18.5 and 24.9 is also generally considered within the healthy weight range.
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