A healthy weight for a 5’8″ male falls between roughly 125 and 163 pounds, based on the standard BMI range of 19 to 24. Most men at this height feel and perform best somewhere in the middle of that range, around 140 to 160 pounds, though your ideal number depends on your build, muscle mass, and age.
The Standard Healthy Range
The National Institutes of Health classifies a BMI between 19 and 24 as “healthy weight.” For someone who stands 5’8″, that translates to a fairly wide spread:
- BMI 19: 125 lbs
- BMI 20: 131 lbs
- BMI 21: 138 lbs
- BMI 22: 144 lbs
- BMI 23: 151 lbs
- BMI 24: 158 lbs
At 164 pounds you’d hit a BMI of 25, which the World Health Organization considers the threshold for overweight. That doesn’t automatically mean 164 is unhealthy for you, but it’s where standard screening tools start flagging elevated risk.
Clinical “ideal body weight” formulas narrow things further. The Devine formula, widely used in medicine since 1974, puts the ideal weight for a 5’8″ man at about 154 pounds. The Robinson formula estimates it slightly lower, around 167 pounds (though this lands above BMI 25, which illustrates how different tools can disagree). These formulas were designed as rough clinical benchmarks, not personal targets.
Why BMI Doesn’t Tell the Whole Story
BMI divides your weight by your height squared. It cannot tell the difference between muscle and fat, and it says nothing about where your body stores fat. A 5’8″ man who lifts weights regularly and weighs 175 pounds may carry less health risk than a sedentary man at 155 pounds with most of his fat concentrated around his midsection.
Research on physically active young men in the U.S. Army explored this question directly. The expectation was that muscular soldiers classified as “overweight” by BMI were simply misclassified. The reality was more nuanced: soldiers in the overweight and obese BMI categories did carry more lean mass than their normal-weight peers, but they also carried a disproportionately higher percentage of body fat. In other words, extra muscle doesn’t automatically cancel out extra fat, even in trained individuals.
For men, a healthy body fat percentage generally falls between 10% and 20%, with the U.S. Army using age-graded cutoffs of 20% for men under 21, 22% for ages 21 to 27, 24% for ages 28 to 39, and 26% for men over 40. If you can’t easily measure body fat, there’s a simpler proxy that research consistently supports.
Waist Size May Matter More Than Scale Weight
Your waist-to-height ratio is a better predictor of heart disease, diabetes, and metabolic problems than BMI alone. A meta-analysis of over 300,000 adults found that waist-to-height ratio outperformed both BMI and waist circumference on its own when identifying people at risk for cardiovascular and metabolic conditions. The rule is straightforward: keep your waist measurement below half your height.
At 5’8″ (68 inches), that means your waist should stay under 34 inches. Measure at the level of your navel, not at your belt line. If you’re 155 pounds but your waist is 36 inches, your weight may technically be “healthy” by BMI while your fat distribution tells a different story. If you’re 170 pounds with a 32-inch waist, you’re likely carrying a favorable ratio of muscle to fat despite a BMI that crosses into the overweight category.
How Age Shifts the Target
If you’re over 65, the numbers shift upward. Large studies on BMI and mortality consistently find that older adults have the lowest risk of death at a BMI around 27.5, which for a 5’8″ man works out to about 181 pounds. That’s solidly in the “overweight” range by standard classifications, yet it’s associated with better survival in older populations. The likely explanation is that carrying some extra weight provides a reserve during illness, surgery, or periods of reduced appetite, and helps protect against the muscle and bone loss that accelerates with age.
For men under 65, the mortality sweet spot sits closer to a BMI of 25, or about 164 pounds at 5’8″. This doesn’t mean you need to land on that exact number. It means that somewhere in the 145 to 165 range is where most younger and middle-aged men at this height will find the best balance of metabolic health and physical function.
Finding Your Personal Target
The “right” weight for you sits at the intersection of several factors: your body fat level, where you carry that fat, your fitness, and your age. A reasonable approach is to use the BMI range as a starting zone (125 to 163 pounds), then refine with your waist measurement. If your waist is comfortably under 34 inches and you’re physically active, you can worry less about the number on the scale, even if it creeps above 164.
If you haven’t been measured recently, stand against a wall without shoes, look straight ahead, and have someone mark your height. People commonly overestimate their height by an inch or more, which shifts the entire BMI calculation. An accurate height measured to the nearest eighth of an inch gives you a reliable baseline. At 5’7″ instead of 5’8″, the healthy weight ceiling drops from 163 to about 159 pounds.
Track trends rather than fixating on a single weigh-in. Body weight fluctuates by two to four pounds day to day based on hydration, food timing, and sodium intake. Weigh yourself at the same time each morning and look at your weekly average. Combine that with a monthly waist measurement, and you’ll have a clearer picture of your health trajectory than any single number can provide.