BMI Chart: What Is a Healthy BMI?

Updated March 2026 · 7 min read · By Travis Cook

BMI is a blunt instrument. One number from your height and weight, and suddenly you're "normal" or "overweight" or "obese." It shows up on every medical chart, every insurance form, every fitness app. Doctors use it because it's quick and easy. But it has real blind spots, and knowing what they are matters.

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BMI Categories

WHO defines four categories. Same cutoffs for men and women, which is part of the problem (more on that below).

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

The formula: weight in kg divided by height in meters squared. In US units: (pounds / inches squared) x 703. You don't need to do this math yourself; our BMI Calculator handles it instantly.

The Limitations of BMI

BMI works fine for studying populations. For individuals, it has real problems.

It doesn't 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 ignores where the fat is. Belly fat (visceral fat) is far more dangerous than fat on your hips and thighs. Someone with a "normal" BMI and a beer gut might be at higher risk than someone at BMI 28 who carries weight in their legs.

The cutoffs are biased. Built on European population data. For Asian descent, health risks show up at lower BMIs. For African descent, the cutoffs may be too conservative. Some health systems have adjusted. Most haven't.

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. Simple, free, surprisingly informative. Over 35 inches (women) or 40 inches (men) means elevated 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 work. Blood pressure, blood sugar, cholesterol, triglycerides. These actually predict disease risk. Someone at BMI 27 with perfect labs is probably healthier than someone at 23 with high blood pressure. The numbers that matter come from a blood draw, not a scale.

Check Your Ideal Weight Range

See what healthy weight looks like for your specific height and frame.

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About the Author

Travis Cook writes about health and wellness for MayoCalc. With a background in radiology and clinical imaging, Travis translates peer-reviewed medical research into practical guidance backed by data from the ADA, AHA, ACC, and CDC. All health content is sourced and linked so you can verify every claim.

BMI FAQ

What is a healthy BMI for a woman?

A BMI of 18.5 to 24.9 is considered normal weight for women according to WHO standards. However, BMI doesn't account for body composition. A woman with significant muscle mass may have a higher BMI while being perfectly healthy. Body fat percentage and waist circumference provide additional context.

What is a healthy BMI for a man?

The same 18.5 to 24.9 range applies to men. However, men naturally carry more muscle mass, which means BMI is even more likely to overestimate fat in muscular men. If your BMI is in the "overweight" range but you exercise regularly and have a flat waist, your BMI may not be an accurate reflection of your health.

Is BMI accurate for athletes?

No. BMI frequently misclassifies athletes as overweight or obese because muscle weighs more than fat by volume. A 6-foot, 220-pound athlete with 12% body fat has a BMI of 29.8 (nearly obese) despite being in excellent shape. Body fat percentage is a much better measure for active individuals.

Does BMI apply to children?

For children and teens (ages 2-19), BMI is interpreted differently using age- and sex-specific percentile charts from the CDC. A child's BMI is compared to other children of the same age and sex rather than using the fixed adult categories. A BMI at or above the 85th percentile is considered overweight, and at or above the 95th percentile is considered obese.

Can I have a normal BMI and still be unhealthy?

Yes. This is sometimes called "normal weight obesity" or "skinny fat." A person can have a normal BMI but carry excess visceral fat (around the organs), have low muscle mass, and have poor metabolic health markers like high blood sugar or cholesterol. BMI is one piece of the puzzle, not the whole picture.

For more on this topic, see our calorie guide.

Sources

Centers for Disease Control and Prevention (CDC): CDC BMI categories and health risk classifications
National Heart, Lung, and Blood Institute (NHLBI): NHLBI BMI classification and obesity guidelines
World Health Organization (WHO): WHO global BMI thresholds and obesity prevalence data

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.

Disclaimer: This article is for general information and is not medical advice. BMI is a screening tool, not a diagnostic one. Consult a healthcare provider for a comprehensive assessment of your health and weight.