For someone who is 5’9″, a healthy weight falls between 125 and 168 pounds, based on the standard BMI range of 18.5 to 24.9. That’s a wide window, and where you personally fall within it depends on your sex, muscle mass, body frame, age, and ethnicity. A single number on a scale tells you less than you might think.
The Standard Healthy Range at 5’9″
The CDC defines a “healthy weight” BMI as 18.5 to just under 25. At 5’9″, that translates to 125 to 168 pounds. Below 125 pounds is considered underweight, 169 to 202 pounds falls into the overweight category, and 203 pounds or more is classified as obese.
These cutoffs are population-level guidelines. They work reasonably well as a starting point for most people, but they don’t account for what your weight is actually made of. Two people at 5’9″ and 180 pounds can look completely different and carry very different health risks depending on how much of that weight is muscle versus fat.
Ideal Weight Estimates for Men and Women
Clinical formulas offer a more specific starting estimate based on sex. The Hamwi formula, one of the most widely used, calculates ideal body weight differently for men and women at 5’9″:
- Men: 160 pounds. The formula starts at 106 pounds for the first 5 feet and adds 6 pounds per additional inch (106 + 54 = 160).
- Women: 145 pounds. This version starts at 100 pounds for the first 5 feet and adds 5 pounds per inch (100 + 45 = 145).
Both estimates allow for a 10% adjustment up or down based on frame size. A large-framed man at 5’9″ might have an ideal weight closer to 176 pounds, while a small-framed woman could be closer to 130. You can get a rough sense of your frame size by wrapping your thumb and middle finger around your opposite wrist. If they overlap, you likely have a small frame; if they don’t touch, a large one.
Why Muscle Mass Changes the Answer
BMI treats all weight the same, which is its biggest limitation. A pound of muscle is denser than a pound of fat, so a person who strength trains regularly can easily land in the “overweight” BMI category while carrying a healthy or even low amount of body fat.
Body fat percentage gives a more accurate picture. For men, health risks increase at around 25% body fat and the threshold for obesity is 30%. For women, those numbers are 36% and 42%, respectively. If you’re at 5’9″ and 180 pounds but your body fat is 18%, you’re in a very different situation than someone at the same height and weight with 30% body fat.
For people who lift weights seriously, a metric called the Fat-Free Mass Index (FFMI) is more useful than BMI. It measures how much lean mass you carry relative to your height. Athletic men generally aim for an FFMI above 20, with 25 considered the natural upper limit. Athletic women aim for above 17, with roughly 22 as their ceiling. If you’re muscular enough that BMI feels misleading, FFMI gives you a better benchmark.
Age Shifts the Target
The “ideal” weight for a 25-year-old and a 70-year-old at the same height isn’t the same. Research on older adults consistently shows that carrying a bit of extra weight is protective. A large study of hospitalized older patients found that mortality was highest in people with low BMI and decreased steadily as BMI increased, leveling off in the obese range rather than climbing back up. In other words, for older adults, being slightly overweight by standard definitions appears safer than being on the lean side.
This doesn’t mean gaining weight intentionally as you age is a good strategy. It means that if you’re over 65 and your BMI is 26 or 27, that may actually be a healthier place for you than aggressively dieting down to 24. Muscle loss accelerates with age, and the reserves that come with a slightly higher weight can be protective during illness or recovery from surgery.
Ethnicity Matters for Risk Thresholds
Standard BMI categories were developed primarily from data on European populations. For people of Asian descent, health risks like type 2 diabetes and cardiovascular disease begin rising at lower weights. The WHO has recommended a narrower “normal” BMI range for Asian populations: 18.5 to 23, rather than the usual 18.5 to 24.9. At 5’9″, that upper limit drops from 168 pounds to about 156 pounds. If you’re of South Asian, East Asian, or Southeast Asian heritage, a weight that looks fine by standard charts may still warrant attention.
Measurements That Matter More Than Weight
Where you carry fat is at least as important as how much you weigh. Fat stored around the midsection, known as visceral fat, wraps around internal organs and drives up the risk of heart disease, diabetes, and metabolic problems far more than fat stored in the hips or thighs.
Two simple measurements can tell you more than a scale:
- Waist circumference: Risk increases significantly at 40 inches or more for men and 35 inches or more for women. Measure at the level of your belly button, not where your belt sits.
- Waist-to-height ratio: Your waist should measure less than half your height. At 5’9″ (69 inches), that means keeping your waist under 34.5 inches.
These numbers are easy to track at home and give you a more direct read on metabolic health than weight alone. Someone at 5’9″ and 165 pounds with a 38-inch waist is carrying more risk than someone at the same height and 175 pounds with a 33-inch waist.
Finding Your Personal Target
For a quick reference at 5’9″, the Hamwi formula gives you 160 pounds for men and 145 for women, plus or minus 10% for frame size. The CDC’s healthy BMI range spans 125 to 168 pounds. If you’re of Asian descent, consider the lower ceiling of about 156 pounds. If you’re over 65, a slightly higher weight than textbook “ideal” is likely fine and possibly beneficial.
Beyond the number on the scale, the most useful things you can do are measure your waist, pay attention to how your body composition is changing over time, and recognize that fitness level and fat distribution matter more than hitting a specific weight. A person at 5’9″ who is active, has a waist under 34.5 inches, and feels strong is in good shape regardless of whether the scale reads 150 or 175.