A healthy weight for a 5’6″ male falls between 115 and 154 pounds, based on standard BMI guidelines from the CDC. That range corresponds to a BMI of 18.5 to 24.9, which is classified as “healthy weight” for adults. But that 40-pound spread is wide for a reason: your ideal number within it depends on your body composition, frame size, and fitness level.
The BMI Weight Ranges for 5’6″
BMI divides weight into four main categories. For someone who stands 5 feet 6 inches tall, the numbers break down like this:
- Underweight (BMI below 18.5): under 115 lbs
- Healthy weight (BMI 18.5 to 24.9): 115 to 154 lbs
- Overweight (BMI 25 to 29.9): 155 to 185 lbs
- Obese (BMI 30 or higher): 186 lbs and above
These categories apply to all adults 20 and older regardless of sex, age, or race, and the CDC has not revised these cutoff points in recent years. BMI is a useful starting point, but it’s a screening tool, not a diagnosis. It can’t tell the difference between 170 pounds of muscle and 170 pounds of fat.
What Clinical Formulas Suggest
Doctors and researchers have developed several formulas to estimate “ideal” body weight. For a 5’6″ male, the four most commonly referenced formulas give different results:
- Devine formula (1974): approximately 160 lbs
- Robinson formula (1983): approximately 155 lbs
- Miller formula (1983): approximately 142 lbs
- Hamwi formula (1964): approximately 148 lbs
These formulas all use height as their only variable. They were originally designed for clinical purposes like calculating medication doses and ventilator settings, not for telling you your perfect weight. Still, the cluster of results between roughly 142 and 160 pounds gives a practical midpoint to think about. Most of them land near the upper end of the BMI “healthy” range, which tends to be realistic for men with average muscle mass.
Why Muscle Mass Changes the Picture
BMI treats all weight the same, which is its biggest limitation. A man at 5’6″ who weighs 170 pounds and lifts weights regularly could have a very different health profile than someone at 170 pounds who is sedentary. Research on fat-free mass index (FFMI), which measures only lean tissue relative to height, found that men with a normal BMI typically have an FFMI between 16.7 and 19.8. If your FFMI is above that range, your higher-than-expected weight likely reflects muscle rather than excess fat.
Body fat percentage offers another lens. For men, a body fat level of 25% or higher is generally considered overweight, and 30% or higher falls into the obese range. If you carry visible muscle and your body fat stays below 25%, weighing more than 154 pounds at 5’6″ doesn’t necessarily indicate a health problem.
Waist Size as a Better Risk Indicator
For assessing actual health risk, where you carry your weight matters more than the number on the scale. Abdominal fat, the kind that wraps around your organs, drives the metabolic dangers associated with excess weight. Two measurements are particularly useful.
Waist circumference alone is a strong predictor. For men, a waist larger than 40 inches is one of the defining criteria for metabolic syndrome, a cluster of conditions that raises the risk of heart disease, stroke, and type 2 diabetes. But you don’t need to hit 40 inches to start paying attention.
The waist-to-height ratio is even more precise. The NHS recommends keeping your waist measurement below half your height. For a 5’6″ male, that means your waist should ideally stay under 33 inches. This simple check works across different body types and is easy to do at home with a tape measure placed at the level of your belly button.
Finding Your Own Target
If you’re at or near 115 to 154 pounds with a waist under 33 inches, you’re in solid territory by every standard measure. If you’re above 154 but physically active and lean, your weight is likely fine, and your waist measurement will confirm that. The concern begins when both your scale weight and your waist circumference are elevated, because that combination reliably predicts metabolic problems regardless of how you look in the mirror.
A practical approach: weigh yourself for a baseline, then measure your waist. If your waist is under 33 inches and your BMI is under 25, you’re in the healthy range by both metrics. If your BMI is in the overweight zone but your waist is still under 33 inches, your extra pounds are more likely muscle than visceral fat. If both numbers are high, that’s where the meaningful health risks begin to accumulate, and losing even 5 to 10% of your body weight can significantly reduce them.