A healthy weight for a 5’6″ female falls between roughly 115 and 154 pounds. That range comes from BMI (body mass index) thresholds, which are the standard screening tool used in clinical settings. But a single number on a scale doesn’t capture everything about your health, and where you fall within that range depends on your body composition, activity level, and frame size.
The Healthy Weight Range for 5’6″
BMI divides adult weight status into four categories: underweight, healthy weight, overweight, and obese. For someone who is 5’6″, those categories translate to the following approximate ranges:
- Underweight: below about 115 pounds (BMI under 18.5)
- Healthy weight: 115 to 154 pounds (BMI 18.5 to 24.9)
- Overweight: 155 to 185 pounds (BMI 25 to 29.9)
- Obese: 186 pounds and above (BMI 30 or higher)
That 40-pound healthy range exists for a reason. Two women at 5’6″ can look and feel completely different at the same weight depending on how much of that weight is muscle, bone, and fat. A naturally broad-shouldered woman with dense bones might be perfectly healthy at 150 pounds, while a smaller-framed woman might feel her best closer to 125.
What “Ideal Body Weight” Formulas Say
Outside of BMI, clinical formulas have tried to pin down a single ideal weight. The most widely referenced is the Devine formula, which calculates ideal body weight for females as 100 pounds for the first 5 feet of height, plus about 5 pounds for each additional inch. For a 5’6″ woman, that comes out to roughly 130 pounds.
This formula was originally developed in the 1970s for medication dosing, not as a fitness or health target. It tends to produce a number that sits near the middle of the healthy BMI range, which can be a useful reference point. But it doesn’t account for muscle mass, frame size, or age, so treat it as a rough midpoint rather than a goal.
Why BMI Doesn’t Tell the Full Story
BMI compares your weight to your height using a simple math formula. It does not distinguish between muscle, bone, and fat. As Baylor College of Medicine notes, using BMI alone can be misleading about an individual’s health status. A woman who strength trains regularly might weigh 160 pounds at 5’6″ and carry a low percentage of body fat, placing her in the “overweight” BMI category despite being in excellent metabolic health. On the other hand, someone within the healthy BMI range could still carry excess fat around her midsection, which is more closely tied to heart disease and metabolic problems than overall weight.
This is why body composition matters more than a number on the scale. There’s no universally agreed-upon normal range for body fat percentage in women, but a 2025 study used 36% body fat as the threshold for overweight and 42% for obesity in females. Those numbers provide a different lens than BMI, one that focuses on what your weight is actually made of.
Waist Size as a Practical Measure
One of the simplest health checks you can do at home involves a tape measure rather than a scale. The NHS recommends keeping your waist circumference below half your height. For a 5’6″ woman (66 inches tall), that means a waist measurement under 33 inches.
This waist-to-height ratio captures something BMI misses: where your body stores fat. Fat concentrated around the abdomen, sometimes called visceral fat, wraps around internal organs and is more metabolically active than fat stored in the hips and thighs. Two women at the same weight can have very different health risks depending on their waist measurements. If your waist is well under 33 inches, your weight is likely distributed in a lower-risk pattern regardless of what the scale says.
What Actually Influences Your Best Weight
Several factors shift where you’ll realistically land within (or slightly outside) that 115-to-154-pound range while still being healthy.
Muscle mass is the biggest variable. Muscle is denser than fat, so building it through resistance training adds weight while shrinking your measurements and improving metabolic health markers. If you’re active and gaining muscle, the scale may climb even as your waist gets smaller and your clothes fit better.
Age plays a role too. Women tend to lose muscle and gain fat gradually after their 30s, which means the same weight at 25 and 55 can represent very different body compositions. Maintaining muscle through exercise becomes increasingly important over time.
Bone structure varies more than people realize. Wrist circumference and shoulder width differ meaningfully between small, medium, and large frames, and a larger frame naturally carries more weight at the same height. A small-framed woman at 5’6″ might gravitate toward the lower end of the healthy range, while a large-framed woman could be healthiest closer to the upper end.
Putting the Numbers Together
If you’re 5’6″ and looking for a target, the 115-to-154-pound healthy BMI range is a reasonable starting point. The Devine formula’s estimate of about 130 pounds sits near the middle of that range and works as a general benchmark. But neither number accounts for your unique body. A more complete picture comes from combining your weight with your waist measurement (under 33 inches), your energy levels, how your clothes fit, and basic health markers like blood pressure and blood sugar.
Weight that lets you move comfortably, sleep well, and maintain stable energy throughout the day is usually a better indicator of health than hitting a specific number. The ranges above give you a framework, but your body’s signals fill in the details that no formula can capture.