For a woman who is 5’6″, a healthy weight falls between approximately 118 and 154 pounds. That range corresponds to a BMI of 18.5 to 24.9, which the CDC classifies as “healthy weight” for adults. A commonly cited clinical formula puts the ideal at 130 pounds, though that single number obscures how much individual variation exists within the healthy range.
Where the 118 to 154 Pound Range Comes From
BMI, or body mass index, is a simple ratio of weight to height. For adults 20 and older, a BMI under 18.5 is considered underweight, 18.5 to 24.9 is healthy, 25 to 29.9 is overweight, and 30 or above falls into the obesity category. At 5’6″, those cutoffs translate to roughly 118 pounds at the low end and 154 pounds at the high end of the healthy range.
The Hamwi formula, a quick calculation doctors have used for decades, gives a more specific estimate: 100 pounds for the first five feet of height, plus 5 pounds for each additional inch. That works out to 130 pounds for a 5’6″ woman. It’s a useful starting point, but it doesn’t account for muscle mass, bone structure, age, or where you carry your weight.
Why Body Frame Size Shifts the Number
Not every woman at 5’6″ has the same skeletal structure, and frame size meaningfully affects what a healthy weight looks like. You can estimate your frame size by measuring the circumference of your wrist. For women over 5’5″, a wrist smaller than 6.25 inches suggests a small frame, 6.25 to 6.5 inches indicates a medium frame, and anything over 6.5 inches points to a large frame.
A small-framed woman at 5’6″ will generally be healthiest closer to the lower end of the 118 to 154 range, while a large-framed woman may feel and function best closer to the upper end. The Hamwi estimate of 130 pounds is designed for a medium frame. Clinicians typically adjust about 10% in either direction for small or large frames, putting the practical range at roughly 117 to 143 pounds depending on your build.
Muscle, Fat, and What BMI Misses
BMI is a weight-to-height ratio, not a body fat measurement. Two women who are both 5’6″ and 150 pounds can have very different health profiles if one carries more muscle and the other carries more body fat. Muscle tissue is denser than fat, so a woman who strength trains or plays competitive sports may land in the “overweight” BMI category while being in excellent metabolic health.
Body fat percentage gives a more complete picture. For women, a body fat range of 16 to 23% is generally considered good, while 24 to 30% is acceptable. Athletic women often fall between 8 and 15%. These numbers shift slightly with age: women under 30 typically range from 14 to 21%, those between 30 and 50 from 15 to 23%, and women over 50 from 16 to 25%. If you want a precise reading, methods like DXA scans, hydrostatic weighing, or bioelectrical impedance testing provide far more useful data than stepping on a bathroom scale.
Where You Carry Weight Matters More Than Total Weight
A growing body of evidence shows that fat stored around your internal organs, called visceral fat, poses greater health risks than fat stored in your hips or thighs. Excess visceral fat is linked to higher rates of cardiovascular disease, type 2 diabetes, and high cholesterol. You can weigh within the “healthy” BMI range and still carry too much visceral fat, or weigh above it and carry your weight in lower-risk areas.
Three simple measurements help you assess this at home:
- Waist circumference: Measure around your waist just above the hip bones. For women, 35 inches or more signals elevated risk from visceral fat.
- Waist-to-hip ratio: Divide your waist measurement by your hip measurement (taken at the widest point). A ratio above 0.85 in women indicates abdominal obesity.
- Waist-to-height ratio: Your waist should be less than half your height. For a 5’6″ woman (66 inches), that means keeping your waist under 33 inches. Research links a ratio above 0.5 to increased risk of circulatory and metabolic disease.
How Age Changes the Picture
The standard BMI categories were developed for the general adult population, but they may not apply equally well to older adults. Research published in the Journal of the American Medical Directors Association found that among hospitalized older patients, the lowest mortality was actually seen in women with BMIs in the 35 to 39.9 range, not in those at the textbook “healthy” range of 18.5 to 24.9. Mortality was highest in patients with very low BMIs, and risk decreased steadily as BMI increased before leveling off in the obese range.
This doesn’t mean gaining weight is protective in older age. It likely reflects that maintaining a higher weight at advanced ages requires relatively good overall health, and that the dangers of being underweight (muscle loss, weakened bones, reduced immune function) become more acute. For women over 65, a BMI in the 25 to 27 range may carry less risk than the standard charts suggest.
Adjusted Thresholds for Asian Women
Standard BMI cutoffs don’t carry the same meaning across all ethnic backgrounds. A WHO expert consultation found that Asian populations face substantially higher risks of type 2 diabetes and cardiovascular disease at BMIs below the conventional 25 cutoff. The revised thresholds classify a BMI of 23 or higher as increased risk and 27.5 or higher as high risk for Asian populations. For a 5’6″ Asian woman, that shifts the upper boundary of the lower-risk range from about 154 pounds down to roughly 142 pounds.
Putting the Numbers in Perspective
The honest answer is that no single number defines “ideal.” A 5’6″ woman at 140 pounds with a 30-inch waist, good cardiovascular fitness, and 22% body fat is in a very different place than a 5’6″ woman at 140 pounds with a 36-inch waist, high blood sugar, and a sedentary lifestyle. The scale captures one dimension of a much more complex picture.
If you’re looking for a starting target, the 118 to 154 pound range is a reasonable guideline, with 130 pounds as a rough midpoint for a medium-framed woman. From there, waist measurements, body fat percentage, and basic fitness markers like blood pressure and blood sugar tell you far more about your actual health than your weight alone.