Your healthy weight depends on your height, body composition, sex, and ethnic background, so there’s no single number that works for everyone. The most common starting point is BMI (body mass index), which classifies a BMI between 18.5 and 24.9 as a healthy weight. For a person who is 5’6″, that translates to roughly 115 to 154 pounds. But BMI is just one piece of the picture, and understanding its limits will help you get a more accurate read on where you stand.
How BMI Estimates Your Healthy Weight
BMI divides your weight in kilograms by your height in meters squared. The CDC uses these categories for adults 20 and older:
- Underweight: below 18.5
- Healthy 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 (severe): 40 or higher
To see where you fall, you can use any online BMI calculator by entering your height and weight. As a quick reference: at 5’4″, a healthy BMI puts you between about 108 and 145 pounds. At 5’10”, the range is roughly 132 to 174 pounds. These ranges are wide because people of the same height can have very different body frames, muscle mass, and fat distribution.
Why BMI Doesn’t Tell the Full Story
The American Medical Association has formally recognized BMI as an imperfect measure. It was developed using data primarily from non-Hispanic white populations and doesn’t account for differences across ethnicities, sexes, or age groups. A muscular person can easily land in the “overweight” category despite having low body fat, while someone with a normal BMI can still carry excess fat around their organs.
BMI correlates reasonably well with body fat across large populations, but it loses accuracy at the individual level. That’s why the AMA recommends using it alongside other measures rather than treating it as a definitive answer. Think of BMI as a rough screening tool, not a diagnosis.
Waist Size and Body Fat Percentage
Two measurements capture what BMI misses: where your fat sits and how much of your body is actually fat versus muscle.
Your waist-to-height ratio is one of the simplest upgrades. Divide your waist circumference by your height (both in the same unit). A ratio above 0.5 signals increased cardiovascular risk, even if your BMI is technically normal. Research from the University of Pittsburgh found that people with a BMI under 30 but a waist-to-height ratio over 0.5 were at higher risk for coronary artery calcification, a key marker of heart disease. In practical terms, your waist should measure less than half your height. If you’re 5’8″ (68 inches), that means keeping your waist under 34 inches.
Body fat percentage is another useful lens. There’s no universally agreed-upon healthy range, but a 2025 study using national survey data defined overweight as body fat of at least 25% for men and 36% for women. Obesity thresholds were 30% for men and 42% for women. You can estimate body fat through methods like skinfold calipers, bioelectrical impedance scales (common in home scales), or a DEXA scan for higher precision.
Adjustments for Ethnicity and Age
Standard BMI cutoffs don’t carry the same meaning for every population. A WHO expert consultation found that people of South Asian and East Asian descent tend to develop metabolic problems like type 2 diabetes at lower BMI levels than people of European descent. While the WHO kept its universal classifications, it identified action points at BMIs of 23 and 27.5 for Asian populations, meaning health risks can start climbing well before BMI hits 25. If you’re of Asian descent, a BMI of 23 or above may already warrant attention to diet and activity.
Age matters too. Older adults tend to lose muscle and gain fat even if their weight stays stable. A BMI that was perfectly healthy at 30 might mask increased body fat at 65. Conversely, slightly higher BMIs in older adults (around 25 to 27) have been associated with better outcomes in some studies, possibly because a modest reserve of weight protects against illness and frailty.
Health Risks of Being Too Light
While most weight discussions focus on excess weight, being underweight (BMI below 18.5) carries its own serious risks. These include bone density loss, muscle wasting, a weakened immune system, anemia, and fertility problems. In children, it can delay growth and development. Being underweight isn’t always about eating too little. Thyroid disorders, digestive conditions, chronic infections, and certain medications can all drive weight below a healthy range.
Health Risks of Excess Weight
Carrying significant excess weight raises the likelihood of type 2 diabetes, high blood pressure, heart disease, stroke, fatty liver disease, sleep apnea, osteoarthritis, kidney disease, and several types of cancer. The risk generally increases as BMI climbs above 30, and it compounds when excess fat concentrates around the midsection. Visceral fat, the fat packed around your internal organs, is more metabolically active and more dangerous than fat stored under the skin on your hips or thighs. That’s why waist measurements add information that the scale alone can’t provide.
Finding Your Personal Target
Rather than chasing a single number on the scale, layer a few measurements together for a clearer picture. Start with BMI to get a ballpark range for your height. Then measure your waist at the navel and calculate your waist-to-height ratio, aiming to stay under 0.5. If you have access to a body fat estimate, check whether it falls within the ranges above for your sex.
Pay attention to trends over time, not snapshots. A steady upward climb in waist circumference over a few years is a more meaningful warning sign than being two pounds above some chart’s “ideal.” Similarly, weight that’s stable but paired with declining fitness or rising blood sugar levels tells you something BMI alone never will.
Your healthiest weight is the one where your blood pressure, blood sugar, cholesterol, energy, and mobility are all in good shape. For most people, that falls somewhere within the BMI 18.5 to 24.9 range, but the exact number varies. A 160-pound person with substantial muscle mass and a 28-inch waist is in a very different situation than a 160-pound person with little muscle and a 38-inch waist, even if they’re the same height.