A woman who is 5’6″ falls within a healthy weight range of roughly 119 to 154 pounds, based on standard BMI guidelines from the National Heart, Lung, and Blood Institute. But that’s a 35-pound spread, and where you land within it depends on your frame size, muscle mass, age, and ethnic background. A single “ideal” number doesn’t exist for everyone at this height.
The Standard Weight Ranges
BMI, or body mass index, sorts weight into four broad categories based on height. For a woman at 5’6″, those categories break down like this:
- Underweight (BMI below 18.5): 118 pounds or less
- Healthy weight (BMI 18.5 to 24.9): 119 to 154 pounds
- Overweight (BMI 25 to 29.9): 155 to 185 pounds
- Obese (BMI 30 or higher): 186 pounds or more
These numbers come from the same BMI table used in most doctor’s offices. They apply equally to all adult women over 20, regardless of age, though some experts argue the ranges should shift slightly for older adults. For women 65 and older, a BMI of 25 to 28 (about 155 to 173 pounds at 5’6″) may actually be protective, providing reserves that help with recovery from illness or surgery.
Where Clinical Formulas Put the “Ideal”
If you want a single target number rather than a range, the Hamwi formula is the one most commonly used in clinical settings. It starts with 100 pounds for the first five feet of height and adds 5 pounds for every inch after that. For a 5’6″ woman, that works out to 130 pounds.
Because bone structure varies, the formula builds in a 10 percent adjustment. Ten percent of 130 is 13 pounds, giving you a range of 117 to 143 pounds. That range is narrower than the full BMI spread, and it’s meant to approximate a midpoint rather than define rigid limits.
How Frame Size Shifts the Range
Your skeletal frame, the width of your bones and joints, meaningfully changes what a healthy weight looks like. The Metropolitan Life Insurance tables, which were built from large-scale mortality data, break it down for a 5’6″ woman:
- Small frame: 120 to 133 pounds
- Medium frame: 130 to 144 pounds
- Large frame: 140 to 159 pounds
A quick way to estimate your frame size: 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. It’s not precise, but it gives you a rough sense of which column you fall into. Notice the difference between the top and bottom of this chart is nearly 40 pounds, all for the same height.
Why Muscle Mass Complicates the Number
BMI treats all weight the same. It can’t distinguish between a pound of fat and a pound of muscle, and muscle is significantly denser. A 5’6″ woman who strength trains regularly could weigh 160 pounds and carry less body fat than a sedentary woman at 140. By BMI alone, the more muscular woman would be classified as overweight, even though her metabolic health markers might be better across the board.
This is why body fat percentage offers a more complete picture than scale weight. For women, a body fat percentage below 36% is generally considered healthy, while 42% or above crosses into the obesity range in terms of health risk. There’s no single agreed-upon “ideal” body fat number, but most health organizations place the healthy zone for adult women between roughly 21% and 35%, depending on age.
If you exercise regularly or carry visible muscle, your healthy weight will likely sit at the higher end of the BMI range, or even slightly above it, without any added health risk.
Ethnic Background and Adjusted Thresholds
Standard BMI cutoffs were developed primarily from data on white European populations, and they don’t account for differences in how body fat distributes across ethnic groups. The World Health Organization has proposed lowering the overweight threshold for people of Asian descent from a BMI of 25 down to 23. For a 5’6″ woman, that shifts the upper end of the healthy range from 154 pounds down to about 142 pounds.
The reason: people of Asian descent tend to carry more visceral fat (the type surrounding internal organs) at lower overall body weights, which raises cardiovascular and metabolic risk earlier than the standard BMI scale would suggest. If you’re of Asian descent, a tighter weight range is worth keeping in mind.
Waist Size as a Better Risk Marker
Your waist measurement often predicts metabolic health more accurately than your total weight. 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 matters because fat stored around the midsection is more metabolically active than fat stored in the hips or thighs. Two women at the same height and weight can have very different health profiles depending on where their fat sits. If your weight falls in the healthy BMI range but your waist exceeds that 33-inch threshold, it’s worth paying attention to. Conversely, if you’re slightly above the “ideal” weight but your waist is well under the cutoff, your risk profile is likely favorable.
Putting It All Together
For a 5’6″ woman, here’s a practical way to think about it: 119 to 154 pounds covers the standard healthy BMI range. Within that, 130 pounds is the clinical midpoint, and your frame size can reasonably push you 13 pounds in either direction. If you’re muscular or athletic, healthy can extend above 154. If you’re of Asian descent, a tighter ceiling around 142 is worth considering.
No single number on the scale captures your health. Weight is one data point. Your waist circumference, how much of your weight is muscle versus fat, your blood pressure, blood sugar, and how you feel day to day all matter at least as much as what the scale reads. The most useful target isn’t a specific number. It’s a range that accounts for your body’s particular frame, composition, and background.