For a woman who is 5’6″, a healthy weight falls between roughly 115 and 154 pounds. That range corresponds to a body mass index (BMI) of 18.5 to 24.9, the bracket the CDC classifies as “healthy weight” for adults. But where you fall within that 40-pound window, and whether the number on the scale even tells the full story, depends on your age, body composition, and ethnic background.
The Standard Healthy Range
BMI is calculated using your weight and height. For a 5’6″ woman, here’s how the standard categories break down:
- Underweight: below 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+)
Several clinical formulas attempt to narrow that range down to a single “ideal” number. The Hamwi equation, one of the most commonly used in clinical settings, puts an ideal weight for a 5’6″ woman at 130 pounds. The Devine formula lands at about 131 pounds, and the Miller formula at roughly 135 pounds. These formulas cluster tightly around 130 to 135 pounds, which sits comfortably in the middle of the healthy BMI range. They’re useful as a general reference point, but they weren’t designed to account for muscle mass, bone density, or individual body type.
Why BMI Doesn’t Tell the Whole Story
BMI measures relative body weight, not body composition. It can’t distinguish between muscle and fat. Research on adolescent athletes found that 62% of those classified as obese by BMI were actually false positives: their body fat levels were completely normal, but their muscle mass pushed their BMI into a higher category. The same principle applies to any woman who strength trains seriously or carries more lean mass than average. You could weigh 160 pounds at 5’6″ and be in excellent health if much of that weight is muscle rather than fat.
Body fat percentage offers a more direct picture. For women, a healthy body fat range is generally 20% to 30%. Women on the more athletic end often fall between 20% and 25%, while those closer to 30% are still within a normal, healthy range. Below 20% is typically seen only in competitive athletes and isn’t necessary for good health.
Waist Size as a Health Marker
Where your body stores fat matters as much as how much you weigh. Fat around the midsection is more closely linked to heart disease, type 2 diabetes, and other metabolic problems than fat stored in the hips or thighs. Two measurements help gauge this risk.
The first is simple waist circumference. Women with a waist measurement over 35 inches have a higher risk of weight-related disease, regardless of their total body weight. The second is your waist-to-height ratio. A useful rule of thumb: keep your waist circumference below half your height. For a 5’6″ woman (66 inches), that means a waist under 33 inches. This ratio has been validated across different sexes and ethnic groups as a reliable screening tool for central obesity.
If your weight falls within the “healthy” BMI range but your waist exceeds these thresholds, you may still carry elevated metabolic risk. The reverse is also true: a woman whose scale weight technically puts her in the overweight category but whose waist is well under 33 inches may have little to worry about.
How Age Shifts the Target
The ideal weight range isn’t static across your lifespan. For women over 65, research consistently shows that carrying a bit more weight is protective. The BMI associated with the lowest mortality risk in older adults is around 27.5, which for a 5’6″ woman translates to about 170 pounds. That’s technically in the “overweight” category by standard BMI definitions, yet it’s linked to better survival than being at the lean end of normal.
This shift happens for several reasons. Older adults who lose weight unintentionally often lose muscle along with fat, which increases frailty and fall risk. Having some extra reserves also provides a buffer during illness or surgery. So a weight that would be worth managing at 35 may be perfectly appropriate, even advantageous, at 70.
Adjusted Ranges for Asian Women
Standard BMI cutoffs were developed primarily from data on European populations. Asian women tend to develop metabolic complications like type 2 diabetes and cardiovascular disease at lower BMI levels. A WHO expert panel revised the thresholds for Asian populations: a normal BMI is 18.5 to 22.9, overweight begins at 23, and obesity at 27.5.
For a 5’6″ Asian woman, that shifts the healthy range downward to roughly 115 to 142 pounds, with overweight beginning around 143 pounds rather than 155. If you’re of East Asian, South Asian, or Southeast Asian descent, these adjusted cutoffs are more relevant to your actual health risk than the standard ranges.
Finding Your Personal Target
A “good weight” is ultimately one where multiple indicators line up, not just the number on the scale. A 5’6″ woman at 145 pounds with a 31-inch waist, healthy body fat percentage, normal blood pressure, and good blood sugar is in a very different place than someone at the same weight whose fat is concentrated in the abdomen. The 115-to-154-pound range is a reasonable starting framework, but the most useful approach combines scale weight with waist measurement and, if accessible, a body fat estimate.
If you strength train regularly, expect your healthy weight to sit at the higher end of the range or even slightly above it. If you’re over 65, don’t aim for the same number you targeted at 30. And if you’re of Asian descent, recognize that the standard cutoffs may underestimate your risk. The best single number for most 5’6″ women in their 20s through 50s is somewhere around 130 to 140 pounds, but the context around that number matters far more than the number itself.