Last updated: March 2026
What Is a Healthy Weight?
A healthy weight isn't a single number — it's a range that depends on your height, gender, body frame, and composition. This calculator uses four medical formulas (Devine, Robinson, Miller, Hamwi) to estimate your ideal range, then adjusts for body frame size. The result is a practical target window rather than an unrealistic single number.
Health organizations define "normal weight" as a BMI between 18.5 and 24.9, which translates to a wide range of actual weights for any given height. A 5'8" person's healthy range spans from about 126 to 163 lbs. The four-formula approach narrows this to a more personalized estimate.
Healthy Weight vs Ideal Weight
"Healthy weight" is about minimizing health risks — staying within a range where your risk of heart disease, diabetes, and other conditions is lowest. "Ideal weight" is a formula-based estimate of what you "should" weigh based on your height and gender. The two overlap significantly but aren't identical.
You can be at a healthy weight while being above or below your formula-based ideal. Body composition matters more than the number on the scale. Two people at the same weight can have very different health profiles depending on their ratio of muscle to fat, where fat is stored, and their metabolic markers.
Frequently Asked Questions
What is a healthy weight?
A healthy weight is the range of body weight associated with the lowest risk of weight-related diseases. It depends on your height, gender, body frame, and body composition. This calculator uses four medical formulas to provide a personalized range, which typically corresponds to a BMI between 20 and 25.
What's the difference between healthy weight and ideal weight?
They're closely related but not identical. 'Ideal weight' is calculated from specific medical formulas for a given height and gender. 'Healthy weight' is a broader concept that considers BMI, body composition, and overall health markers. Someone can be outside their 'ideal' formula weight and still be at a healthy weight.
How do I know if I'm at a healthy weight?
Multiple indicators matter: BMI (18.5–24.9 is normal), waist circumference (under 35" for women, 40" for men), body fat percentage (10–20% for men, 18–28% for women), and metabolic markers (blood pressure, blood sugar, cholesterol). If most are in the normal range, your weight is likely healthy.
Can I be healthy at a weight outside the 'ideal' range?
Absolutely. These formulas use population averages and don't account for muscle mass, bone density, or individual variation. An athletic person with high muscle mass may weigh well above their 'ideal' while having excellent health markers. Focus on how you feel, your fitness level, and your medical test results.
How does age affect healthy weight?
Body composition changes with age — lean mass typically decreases while fat mass increases. Some research suggests slightly higher weights (BMI 25–27) may be protective in adults over 65. For younger adults, the standard ideal weight ranges are most applicable. These formulas don't adjust for age.
Is it better to be slightly underweight or slightly overweight?
Research generally shows that mild overweight (BMI 25–27) carries lower mortality risk than mild underweight (BMI 17–18.5). However, where fat is stored matters — abdominal fat is more dangerous than fat elsewhere. The healthiest zone is a BMI of 20–25 with a normal waist circumference.