BMI Chart: What Is a Healthy BMI?
BMI (body mass index) is a simple number calculated from your height and weight. It is the most widely used screening tool for categorizing weight, and it appears on nearly every medical chart. But BMI has significant limitations, and a single number cannot tell you everything about your health. Here is what your BMI actually means, when it is useful, and when you should look beyond it.
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The World Health Organization (WHO) defines four main BMI categories for adults. These apply to both men and women.
| BMI Range | Category | Health Risk |
|---|---|---|
| Under 18.5 | Underweight | Increased risk of malnutrition, osteoporosis, weakened immune system |
| 18.5 - 24.9 | Normal weight | Lowest overall health risk from weight-related conditions |
| 25.0 - 29.9 | Overweight | Moderately increased risk of heart disease, diabetes, high blood pressure |
| 30.0 - 34.9 | Obese (Class 1) | Significantly increased health risk |
| 35.0 - 39.9 | Obese (Class 2) | High health risk |
| 40.0+ | Obese (Class 3) | Very high health risk |
BMI by Height and Weight
Here is what different BMI values look like for common heights. All weights are in pounds.
| Height | BMI 18.5 (min normal) | BMI 25 (overweight starts) | BMI 30 (obese starts) |
|---|---|---|---|
| 5'0" | 95 lbs | 128 lbs | 153 lbs |
| 5'4" | 108 lbs | 145 lbs | 174 lbs |
| 5'8" | 122 lbs | 164 lbs | 197 lbs |
| 6'0" | 137 lbs | 184 lbs | 221 lbs |
| 6'4" | 152 lbs | 205 lbs | 246 lbs |
How BMI Is Calculated
BMI uses a simple formula: your weight in kilograms divided by your height in meters squared. In US units, it is weight in pounds divided by height in inches squared, multiplied by 703. You do not need to do this math yourself; our BMI Calculator handles it instantly.
The Limitations of BMI
BMI is a useful population-level screening tool, but it has real limitations at the individual level.
It does not distinguish between muscle and fat. A muscular athlete and a sedentary person of the same height and weight will have the same BMI, even though their body composition and health profiles are completely different. Many professional athletes have BMIs in the "overweight" range despite having very low body fat.
It does not account for fat distribution. Where you carry fat matters more than how much you weigh. Fat stored around the abdomen (visceral fat) is more strongly associated with heart disease, diabetes, and metabolic syndrome than fat stored in the hips and thighs. Someone with a "normal" BMI but a lot of belly fat may be at higher risk than someone with a higher BMI who carries weight in their legs.
It varies by ethnicity. The standard BMI cutoffs were developed primarily from studies of European populations. Research shows that health risks may occur at lower BMI levels for people of Asian descent and at higher levels for people of African descent. Some health organizations use different thresholds for different populations.
It changes with age. Older adults tend to lose muscle and gain fat, so a "normal" BMI in a 75-year-old may mask significant muscle loss. Conversely, carrying a slightly higher BMI in older age has been associated with better outcomes in some studies, a phenomenon called the "obesity paradox."
Better Measures to Use Alongside BMI
Waist circumference is one of the simplest and most useful additions. A waist measurement over 35 inches for women or 40 inches for men is associated with increased health risk, regardless of BMI. Measure around your natural waistline (at the level of your navel) using a soft tape measure. Our Waist-to-Hip Ratio Calculator adds even more context.
Body fat percentage gives a more direct picture of body composition than BMI. Healthy ranges are roughly 14-24% for men and 21-31% for women, though these vary by age and fitness level. See our Body Fat Calculator and body fat guide for more detail.
Blood markers like blood pressure, blood sugar, cholesterol, and triglycerides are ultimately what matter for disease risk. A person with a BMI of 27 and perfect blood work is likely in better health than a person with a BMI of 23 and high blood pressure. Regular checkups with your doctor are more informative than any single number on a scale.
Check Your Ideal Weight Range
See what healthy weight looks like for your specific height and frame.
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Related Tools
Calculate your BMI with the BMI Calculator, find your healthy weight range with the Ideal Weight Calculator, estimate your body fat with the Body Fat Calculator, or check your waist-to-hip ratio with the Waist-to-Hip Ratio Calculator.