For a woman who is 5’7″, a healthy weight falls between roughly 121 and 153 pounds. That range corresponds to a body mass index (BMI) of about 18.5 to 24.9, which the CDC classifies as “healthy weight” for adults. But that 32-pound span is wide for a reason: your ideal weight within it depends on your muscle mass, body fat distribution, age, and overall metabolic health.
How the 121 to 153 Pound Range Is Calculated
BMI is a simple formula that divides your weight by the square of your height. The CDC defines four main categories for adults 20 and older:
- Underweight: BMI below 18.5
- Healthy weight: BMI 18.5 to 24.9
- Overweight: BMI 25 to 29.9
- Obesity: BMI 30 or higher
At 5’7″, a BMI of 18.5 works out to about 118 to 121 pounds, and a BMI of 24.9 lands near 153 to 159 pounds, depending on the exact calculation used. The National Heart, Lung, and Blood Institute’s BMI table places the healthy range for this height at 121 to 153 pounds using whole-number BMI values of 19 through 24.
Below 118 pounds at this height puts you in the underweight category, while 160 pounds and above crosses into overweight territory. These thresholds are population-level guidelines, not personalized diagnoses. They’re a starting point, not the full picture.
Why BMI Doesn’t Tell the Whole Story
BMI treats all weight the same. It cannot distinguish between muscle, fat, bone density, or water retention. A 5’7″ woman who strength trains seriously might weigh 155 or 160 pounds with a low body fat percentage and excellent cardiovascular health, yet her BMI would label her overweight. That’s because BMI was designed for population screening, not for evaluating individual body composition.
Researchers have developed a complementary measurement called the fat-free mass index (FFMI), which separates lean mass from fat mass and adjusts for height. FFMI can identify women who carry above-average muscle without excess body fat, situations where BMI alone gives a misleading result. You won’t encounter FFMI in a typical doctor’s visit, but it highlights an important principle: the number on the scale matters less than what that weight is made of.
Body Fat Percentage by Age
Body fat percentage offers a more direct look at health than weight alone. For women, the general classifications are:
- Athletic: 8 to 15%
- Good (fit): 16 to 23%
- Acceptable: 24 to 30%
- Overweight range: 31 to 36%
- Obese range: above 37%
These numbers also shift with age. For women under 30, a typical healthy body fat percentage is 14 to 21%. Between 30 and 50, the range nudges up to 15 to 23%. After 50, 16 to 25% is considered normal. This gradual increase reflects natural changes in hormones and metabolism, not a failure to stay fit. Smart scales, DEXA scans, and skinfold calipers all estimate body fat percentage, though accuracy varies. A DEXA scan is the most reliable option widely available.
Waist Size as a Health Marker
Where you carry fat can matter more than how much you weigh. Fat stored around the midsection, known as visceral fat, wraps around internal organs and is more strongly linked to heart disease, insulin resistance, and inflammation than fat stored in the hips or thighs.
A practical way to check this is the waist-to-height ratio. The NHS recommends keeping your waist circumference below half your height. For a 5’7″ woman (67 inches tall), that means a waist measurement under 33.5 inches. To measure, wrap a tape measure around your bare waist at the level of your belly button, standing relaxed without sucking in. If you’re within the healthy BMI range but your waist exceeds that threshold, the distribution of your body fat may still pose health risks worth addressing.
Metabolic Health Matters at Any Weight
Two women can weigh the same amount and have very different health profiles. Researchers studying “metabolically healthy” versus “metabolically unhealthy” individuals look beyond the scale at a cluster of markers: blood pressure, fasting blood sugar, triglycerides, HDL cholesterol, and insulin sensitivity. A person is generally considered metabolically healthy when most or all of these markers fall within normal ranges, regardless of BMI category.
That said, this concept has limits. Long-term studies show that people with excess weight who currently have normal metabolic markers still face a higher risk of developing problems over time compared to metabolically healthy people at a normal weight. In other words, good blood work right now is encouraging, but it doesn’t make weight entirely irrelevant. The most useful approach is tracking both: your weight trend and your metabolic markers together give a clearer picture than either one alone.
Adjustments for Women Over 65
The standard BMI categories were developed primarily from data on younger and middle-aged adults. For women over 74, some health authorities suggest that a slightly higher BMI of 22 to 26 may actually be protective. At 5’7″, a BMI of 26 corresponds to roughly 166 pounds, about 13 pounds above the standard “healthy” ceiling.
The reasoning is straightforward. As women age, carrying a small amount of extra weight appears to provide a buffer during illness, surgery, or falls. Being underweight in older age is consistently associated with worse outcomes than being mildly overweight. If you’re in your 60s or 70s, overall fitness, bone density, and the ability to perform daily activities are more meaningful health indicators than hitting a specific number on the scale.
Practical Ways to Find Your Personal Target
The 121 to 153 pound range is a useful starting zone, but your personal healthy weight is the one where you feel energetic, sleep well, maintain stable blood sugar, and can stay physically active without joint pain or chronic fatigue. Some practical steps to narrow it down:
- Track your waist measurement alongside your weight. A waist under 33.5 inches at 5’7″ is a strong signal of healthy fat distribution.
- Get your metabolic markers checked. Blood pressure, fasting glucose, and a basic lipid panel reveal what the scale cannot.
- Consider a body composition test. A DEXA scan or even a reliable bioimpedance scale gives you a body fat percentage to work with, which is far more informative than weight alone.
- Factor in your activity level. If you strength train regularly, expect to sit at the higher end of the healthy range or even slightly above it, and that’s perfectly fine if your body fat percentage and metabolic markers look good.
Weight is one data point in a larger picture. For a 5’7″ woman, 121 to 153 pounds is the textbook answer, but the best target is the weight where your body composition, blood work, and daily energy all line up.