What the CDC Calls "Overweight"
The Centers for Disease Control and Prevention (CDC) defines overweight for adults age 20 and older as a Body Mass Index between 25.0 and 29.9. BMI is a screening number calculated from weight and height, expressed in kg/m². It is not a body fat measurement, but it lines up well with body fatness at a population level and is the metric US clinicians rely on first.
Roughly 1 in 3 American adults sits in the overweight band. Many never develop a weight-related disease, while others progress toward obesity (BMI 30+) or develop metabolic issues even before crossing that line. The CDC's position is that BMI is a starting point, not a verdict, and should be paired with waist circumference, blood pressure, and lab work before any treatment decision is made.
CDC BMI Classification Table
| BMI Range | CDC Category | Health Implication |
|---|---|---|
| Below 18.5 | Underweight | Possible nutrient deficiency risk |
| 18.5 - 24.9 | Normal weight | Lowest risk of chronic disease |
| 25.0 - 29.9 | Overweight | Increased risk of obesity-related conditions |
| 30.0 - 34.9 | Obese (Class I) | High risk of chronic disease |
| 35.0 - 39.9 | Obese (Class II) | Very high risk of complications |
| 40.0+ | Obese (Class III) | Severe, clinically significant risk |
How to Calculate Your BMI
The CDC uses the same formula worldwide health agencies use: weight in kilograms divided by the square of height in meters. For US units, the formula becomes BMI = (weight in pounds ÷ height in inches²) × 703. A 5'9" adult weighing 175 lb lands at a BMI of about 25.8, which places them just inside the overweight band.
You can skip the arithmetic and let our free tool do it in the browser. Enter height and weight, get an instant CDC classification, and see exactly where you fall on the chart.
Health Risks of the Overweight Range
Risk does not jump suddenly at BMI 30. The CDC and NIH data show a gradual climb in disease risk across the 25-29.9 band, especially when excess weight sits around the abdomen. Conditions the CDC ties to this range include:
- Pre-diabetes and type 2 diabetes
- Hypertension (high blood pressure)
- Dyslipidemia (high triglycerides, low HDL)
- Coronary heart disease and stroke
- Gallbladder disease and fatty liver
- Osteoarthritis of the knees and hips
- Sleep apnea and chronic breathing issues
- Certain cancers, including post-menopausal breast and colorectal
The CDC specifically calls out waist circumference as a second-line screening tool. Risk climbs sharply when waist measurement exceeds 40 inches (102 cm) in men or 35 inches (89 cm) in women, even if BMI is still under 30.
Why Some Adults in the Overweight Range Stay Healthy
BMI cannot tell muscle from fat. A lean, athletic man with dense muscle mass can post a BMI of 27 without carrying excess body fat. The CDC acknowledges this limitation and recommends pairing BMI with body fat percentage, waist-to-hip ratio, or waist-to-height ratio when results seem out of step with how a person looks and feels.
Lifestyle markers matter too. Adults in the 25-29.9 range who meet the CDC's physical activity guidelines (150 minutes of moderate aerobic activity per week plus two strength sessions) and eat a balanced diet often show healthy blood sugar, blood pressure, and cholesterol. The number on the scale is one data point among many.
CDC Recommendations for the Overweight Range
CDC guidance for adults in the 25-29.9 band emphasizes lifestyle modification first, before pharmacotherapy or referral to a structured weight management program:
- Aim for a 5-10% weight loss over six months through diet and exercise
- Reduce processed foods, sugary drinks, and refined carbohydrates
- Build up to 150-300 minutes of moderate aerobic activity per week
- Add resistance training two or more days per week to preserve muscle
- Treat sleep apnea and address stress, both of which affect weight
- Re-check BMI, waist circumference, and labs every 3-6 months
Overweight in Children and Teens
CDC growth charts use percentiles rather than fixed cutoffs for ages 2-19. A child is classified as overweight when BMI-for-age falls between the 85th and 95th percentile for their age and sex. Obese is defined as at or above the 95th percentile. Pediatricians track the trajectory over time, not just the snapshot, since a single value can reflect a growth spurt.
What to Do Next
If your BMI lands in the 25-29.9 band, treat it as a prompt for a deeper conversation with a clinician rather than a diagnosis. Check your numbers, measure your waist, and review the other CDC BMI categories below to see how the bands compare.