For adults, overweight is defined as a body mass index (BMI) between 25 and 29.9. There’s no single number on a scale that makes someone overweight, because it depends on your height. A 5’4″ person crosses into overweight territory at about 145 pounds, while a 5’10” person doesn’t reach that threshold until roughly 174 pounds.
How BMI Determines Weight Status
BMI is a simple ratio of your weight to your height. The formula in pounds and inches is: weight divided by height squared, then multiplied by 703. In metric units, it’s your weight in kilograms divided by your height in meters squared. The result places you into one of several categories:
- Underweight: below 18.5
- Normal weight: 18.5 to 24.9
- Overweight: 25 to 29.9
- Obesity class 1: 30 to 34.9
- Obesity class 2: 35 to 39.9
- Obesity class 3: 40 or higher
To put that in practical terms, here’s roughly where the overweight threshold (BMI of 25) falls for common heights:
- 5’0″: about 128 lbs
- 5’4″: about 145 lbs
- 5’8″: about 164 lbs
- 6’0″: about 184 lbs
- 6’2″: about 194 lbs
These numbers mark the beginning of the overweight range. You’d stay classified as overweight until your BMI reaches 30, at which point the classification shifts to obesity.
Different Thresholds for Asian Populations
The standard BMI cutoffs were developed primarily from data on white European populations. Research has shown that people of Asian descent tend to develop weight-related health problems at lower BMI levels. The World Health Organization set adjusted thresholds: overweight begins at a BMI of 23 (instead of 25), and obesity begins at 27.5 (instead of 30). For a 5’4″ person, that means the overweight threshold drops from 145 pounds to about 134 pounds. If you’re of East Asian, South Asian, or Southeast Asian descent, these lower cutoffs give a more accurate picture of your health risk.
Overweight in Children and Teens
Kids and teenagers are evaluated differently because their body composition shifts as they grow. Instead of fixed BMI numbers, the CDC uses percentile charts that compare a child’s BMI to others of the same age and sex. A child between the 85th and 95th percentile is considered overweight. At or above the 95th percentile, the classification becomes obesity. Your pediatrician plots these values on growth charts at regular checkups, so you don’t need to calculate them yourself.
Why BMI Doesn’t Tell the Whole Story
BMI is a screening tool, not a diagnosis. It measures total weight relative to height, but it can’t distinguish between muscle, fat, bone, and water. A muscular person who lifts weights regularly could have a BMI of 27 and carry very little excess body fat. On the other hand, someone with a “normal” BMI might carry a disproportionate amount of fat around their organs, which poses real health risks.
BMI’s relationship to health also varies by age, sex, and ethnicity in ways the standard chart doesn’t capture. The American Medical Association adopted a policy recognizing these limitations and recommending that BMI be used alongside other measures rather than as a standalone diagnostic tool. That means your doctor should be looking at the full picture, not just one number.
Other Ways to Measure Body Fat Risk
Two measurements can fill in where BMI falls short, and both require nothing more than a tape measure.
Waist circumference captures how much fat you carry around your midsection, which is the type most strongly linked to heart disease and metabolic problems. The WHO considers a waist above 35 inches (88 cm) for women or above 40 inches (102 cm) for men to be high risk, regardless of your BMI.
Waist-to-hip ratio compares the narrowest part of your waist to the widest part of your hips. A ratio above 0.85 for women or above 0.90 for men is considered abnormal and signals excess abdominal fat. This measurement is especially useful for people whose BMI sits in the normal or borderline range but who carry most of their weight in their midsection.
Health Risks in the Overweight Range
Being in the overweight BMI range (25 to 29.9) does carry increased health risks, but they’re more modest and selective than many people assume. The clearest link is with cardiovascular disease. Data from large population studies show that people in the overweight range have roughly 40 to 65 percent higher risk of dying from heart disease and stroke compared to those with a normal BMI. High blood pressure, elevated cholesterol, and insulin resistance all become more common as BMI climbs above 25.
For other causes of death, the picture is more nuanced. The overweight range doesn’t appear to raise risk for many endocrine and metabolic disorders the way obesity does, and some studies have found that people with a BMI of 25 to 30 actually have lower rates of respiratory disease than their normal-weight peers. Cancer risk in this range is less consistent across studies, with some populations showing elevated risk and others showing none.
The practical takeaway: being overweight isn’t a health emergency, but it does put extra strain on your cardiovascular system. Where your body stores that extra weight matters as much as how much you carry. Someone with a BMI of 27 and a 32-inch waist faces a different risk profile than someone with the same BMI and a 38-inch waist.
What the Number Actually Means for You
If you’ve checked your BMI and landed in the overweight range, it’s worth looking at the broader context. Consider your waist measurement, your blood pressure, your blood sugar levels, and your family history. A BMI of 26 in someone who exercises regularly, has normal blood pressure, and carries weight in their hips is a very different situation from a BMI of 26 in someone with prediabetes and a large waist.
BMI is a starting point, not a verdict. It’s most useful as one data point among several that together paint a picture of your metabolic health. The number on the scale matters less than what’s happening inside your body, and the only way to know that is to look beyond BMI alone.