A healthy weight for a 5’6″ woman falls between 118 and 148 pounds, based on the standard BMI categories used by the CDC and National Institutes of Health. That range corresponds to a BMI of 18.5 to 24.9, which is the bracket associated with the lowest risk of weight-related health problems. But that 30-pound spread exists for a reason: bone structure, muscle mass, and body fat distribution all shift where your personal sweet spot lands within it.
The Standard Weight Range, Explained
BMI divides adult weight status into four main categories, and for someone who is 5’6″, the cutoffs translate to specific numbers on the scale:
- Underweight (BMI below 18.5): under 118 lbs
- Healthy weight (BMI 18.5 to 24.9): 118 to 148 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. They’re a population-level screening tool, not a personalized diagnosis. A woman at 150 pounds and 5’6″ technically crosses into overweight territory by BMI, but that number alone says very little about her actual health.
What “Ideal Body Weight” Formulas Say
Doctors and pharmacists sometimes use clinical formulas to estimate an ideal body weight. Two of the most common ones land in a similar neighborhood for a 5’6″ woman. The Devine formula (widely used in medication dosing) calculates roughly 131 pounds. The Hamwi formula, which is more common in nutrition settings, arrives at 130 pounds as a baseline, then adds a 10% range in either direction to account for frame size. That gives a window of about 117 to 143 pounds.
These formulas were developed decades ago for narrow clinical purposes, not as weight goals. They tend to favor lighter frames and can underestimate a reasonable weight for women who carry more muscle or have larger bone structures. Think of them as one data point, not a target.
Why the Scale Doesn’t Tell the Whole Story
BMI treats all weight the same. It doesn’t distinguish between fat, muscle, and bone mass. A woman who strength trains regularly might weigh 155 pounds at 5’6″ and carry less body fat than someone at 135 who is sedentary. By BMI standards, the first woman is overweight. By almost every meaningful health metric, she’s not.
This is one of the most well-documented limitations of BMI. It works reasonably well as a quick screening tool for large populations, but it can misclassify individuals, particularly those who are muscular or athletic. If you’ve been active and feel strong at a weight that falls outside the “healthy” BMI range, the number on the scale may simply be reflecting muscle tissue rather than excess fat.
Waist Size May Matter More Than Weight
Where your body stores fat is at least as important as how much you weigh. Visceral fat, the fat packed around your internal organs in the abdomen, drives the metabolic problems most people associate with being overweight: heart disease, type 2 diabetes, and insulin resistance. You can carry a normal amount of total body fat and still have too much of it in your midsection.
For women, a waist circumference above 35 inches signals higher risk for heart disease and type 2 diabetes, according to both the American Heart Association and the National Heart, Lung, and Blood Institute. A waist-to-hip ratio above 0.85 also indicates abdominal obesity. The NHS recommends a simpler rule: keep your waist measurement under half your height. For a 5’6″ woman (66 inches), that means a waist under 33 inches.
You can measure your waist at home with a flexible tape measure placed just above your hip bones, level with your navel. This takes about 10 seconds and, for many people, is a more useful health indicator than stepping on a scale.
Factors That Shift Your Personal Range
Several things influence where a healthy weight falls for you specifically, even compared to another woman at the same height.
Muscle mass. Muscle is denser than fat, so two women at 5’6″ can look and feel very different at the same weight. If you lift weights or do physically demanding work, expect your healthy weight to sit higher in the range, or even slightly above it.
Frame size. Bone structure varies. A simple way to estimate yours: wrap your thumb and index finger around your wrist. If they overlap, you likely have a small frame. If they just touch, medium. If there’s a gap, large. Small-framed women tend to be healthiest toward the lower end of the range, while large-framed women may feel their best closer to 145 to 150.
Age. Body composition shifts naturally over time. Women tend to lose muscle mass and gain fat tissue after menopause, even without changes in weight. A weight that was healthy at 30 might represent a different body composition at 55. Staying active, particularly with resistance exercise, helps preserve muscle and keeps your weight working in your favor.
Body fat distribution. Two women at 140 pounds can have very different health profiles depending on whether their fat is stored in the hips and thighs (lower metabolic risk) or around the waist (higher risk). This is why waist measurements add information the scale can’t provide.
Putting the Numbers Together
If you’re looking for a single target, the 118 to 148 pound range is where most 5’6″ women will find a weight that supports long-term health. Clinical formulas narrow that to roughly 130 pounds as a midpoint, with a realistic spread of 117 to 143 depending on build. But these are starting points for thinking about your body, not finish lines.
A more complete picture combines your weight with your waist circumference (under 33 to 35 inches), how you feel physically, and whether your bloodwork and blood pressure are in healthy ranges. Plenty of women at 5’6″ thrive at 150 or even 155 pounds because their weight is composed of muscle, their waist is well under the risk threshold, and their metabolic markers look good. The best weight for you is one where your body functions well and stays there without extreme restriction.