A 5’8″ male falls within a healthy weight range of roughly 122 to 164 pounds, based on standard BMI guidelines from the CDC. That range corresponds to a BMI of 18.5 to 24.9, which is the “healthy weight” category for adults. But that 42-pound spread is wide for a reason: your build, muscle mass, and body fat all shift where your personal sweet spot falls.
The Standard BMI Range for 5’8″
BMI is calculated by dividing your weight in pounds by your height in inches squared, then multiplying by 703. For someone who stands 5’8″ (68 inches), the math breaks down like this:
- Underweight: below about 122 pounds (BMI under 18.5)
- Healthy weight: 122 to 164 pounds (BMI 18.5 to 24.9)
- Overweight: 165 to 197 pounds (BMI 25 to 29.9)
- Obese: 198 pounds or more (BMI 30+)
These thresholds come from the CDC and are the same ones your doctor uses at a checkup. They apply to adults 20 and older regardless of age, though body composition does shift as you get older.
Where the Lowest Health Risk Falls
Not every BMI within the “healthy” range carries equal risk. A large pooling study published in the New England Journal of Medicine found that the lowest risk of death from all causes sat in a BMI range of 22.5 to 24.9. For a 5’8″ male, that translates to about 148 to 164 pounds. People in the overweight category (BMI 25 to 29.9) had a 13 percent higher risk of dying during the study’s follow-up period, while those with a BMI of 30 to 34.9 had a 44 percent higher risk. The increases grew steeper from there: 88 percent higher at a BMI of 35 to 39.9, and 2.5 times higher at a BMI of 40 or above.
This doesn’t mean 150 pounds is the magic number for every 5’8″ man. It means that, across large populations, the upper half of the healthy BMI range tends to be the metabolic sweet spot when muscle mass is adequate and body fat isn’t excessive.
How Frame Size Changes the Target
Your bone structure matters more than most people realize. The Metropolitan Life Insurance tables, which were built from decades of actuarial data, break ideal weight for a 5’8″ man into three categories based on frame size:
- Small frame: 140 to 148 pounds
- Medium frame: 145 to 157 pounds
- Large frame: 152 to 172 pounds
A simple way to estimate your frame: wrap your thumb and middle finger around your opposite wrist. If they overlap, you likely have a small frame. If they just touch, medium. If there’s a gap, large. A large-framed man at 170 pounds can be perfectly healthy, while that same weight on a small frame might mean excess fat.
Why the Ideal Body Weight Formula Exists
Doctors and pharmacists often use a clinical shortcut called the Devine formula to estimate ideal body weight. For men, it works out to about 110 pounds for the first five feet of height, plus roughly 5 pounds for each additional inch. At 5’8″, that gives you about 150 to 151 pounds. This isn’t a fitness goal. It was originally designed to calculate medication dosages. But it does land right in the middle of the ranges above, which makes it a reasonable ballpark for a medium-framed man with average muscle mass.
Body Fat Matters More Than the Scale
BMI can’t tell the difference between muscle and fat. A 5’8″ man who lifts weights regularly and weighs 180 pounds might have a BMI of 27.4, which technically qualifies as overweight, yet carry a low body fat percentage and face fewer health risks than a sedentary man at 155 pounds with little muscle. A 2025 study using national survey data defined overweight for men as having at least 25 percent body fat, and obesity as at least 30 percent body fat. Those thresholds are more useful than BMI alone if you have access to a body composition measurement.
As you age, this becomes even more relevant. Muscle mass naturally declines over time, which means you can stay the same weight on the scale while your body quietly replaces muscle with fat. One practical signal: if your weight holds steady but your waist size is increasing, you’re likely gaining fat and losing muscle.
Your Waist Is a Better Warning Sign
Waist circumference captures something BMI misses: where your body stores fat. Fat around the midsection (visceral fat) is more closely linked to heart disease, type 2 diabetes, and metabolic problems than fat stored in your hips or thighs. The NHS recommends keeping your waist measurement below half your height. For a 5’8″ man, that means your waist should stay under 34 inches.
You can measure this at home with a flexible tape measure wrapped around your midsection at the level of your belly button. If you’re within the healthy BMI range but your waist exceeds 34 inches, the number on the scale may be giving you a false sense of security. If you’re slightly above the BMI cutoff but your waist is well under 34 inches, you’re likely in better metabolic shape than BMI suggests.
Putting It All Together
For most 5’8″ men with an average build, a weight between 145 and 165 pounds hits the intersection of BMI guidelines, clinical formulas, frame-adjusted tables, and mortality data. If you have a larger frame or carry significant muscle, the upper 160s to low 170s can be perfectly healthy. If you have a smaller frame and less muscle, the low 140s may be more appropriate.
The most useful approach is to treat the scale as one data point, not the only one. Pair it with your waist measurement and an honest assessment of your activity level. A 5’8″ man at 160 pounds with a 32-inch waist and regular exercise is in a very different place than one at 160 pounds with a 38-inch waist and a sedentary routine, even though the scale reads the same.