Discover Your Healthy Weight Range Based on Science
Popular modern formula
Adjusted for modern averages
Originally for medication dosing
Classic simple formula
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Determining your ideal weight is one of the most common health questions people ask. Unlike a single magic number, your healthy weight exists within a range that depends on your height, gender, body frame, age, and overall body composition. In 2026, with advances in health science and a better understanding of body diversity, we now know that ideal weight is more nuanced than ever before.
Ideal weight refers to the weight range at which your body functions optimally, with the lowest risk of weight-related health conditions. It is not about achieving a specific number on the scale, but rather finding a sustainable weight that supports your overall health, energy levels, and quality of life.
It is important to understand that "ideal" does not mean "perfect." Your ideal weight is a range, not a single point. Most people can be healthy across a fairly wide weight spectrum. The key is finding where you feel your best and where your health markers are in good ranges.
Over the decades, researchers have developed several formulas to estimate ideal body weight. Each has its own methodology and intended use:
| Formula | Men | Women | Base Height |
|---|---|---|---|
| Devine (1974) | 50 kg + 2.3 kg per inch over 5 ft | 45.5 kg + 2.3 kg per inch over 5 ft | 5 feet (152.4 cm) |
| Robinson (1983) | 52 kg + 1.9 kg per inch over 5 ft | 49 kg + 1.7 kg per inch over 5 ft | 5 feet (152.4 cm) |
| Miller (1983) | 56.2 kg + 1.41 kg per inch over 5 ft | 53.1 kg + 1.36 kg per inch over 5 ft | 5 feet (152.4 cm) |
| Hamwi (1964) | 48 kg + 2.7 kg per inch over 5 ft | 45.5 kg + 2.2 kg per inch over 5 ft | 5 feet (152.4 cm) |
The Devine Formula was originally developed in 1974 for estimating creatinine clearance in medication dosing. It has become widely used as a general ideal weight estimator but tends to give lower estimates for taller individuals.
The Robinson Formula updated the Devine formula in 1983 using more recent data. It generally produces slightly higher ideal weight estimates, which many consider more realistic for modern body frames.
The Miller Formula also from 1983, provides yet another perspective. It tends to give the highest estimates among the classic formulas, which may better reflect contemporary averages.
The Hamwi Formula is the simplest and oldest (1964). It is quick to calculate mentally and remains popular in clinical settings for its ease of use.
One factor often overlooked in ideal weight calculations is body frame size. People with larger bone structures naturally weigh more than those with smaller frames, even at the same height and body fat percentage. Our calculator adjusts for this:
To estimate your frame size, wrap your thumb and middle finger around your wrist. If your fingers overlap, you likely have a small frame. If they just touch, you have a medium frame. If they do not meet, you have a large frame.
Staying within a healthy weight range provides numerous benefits:
While ideal weight formulas provide useful estimates, true health encompasses much more:
If your current weight is outside your ideal range, set achievable goals. Research shows that losing just 5-10% of your body weight can produce significant health improvements, including better blood sugar control and reduced blood pressure. Focus on sustainable lifestyle changes rather than rapid weight loss, which often leads to rebound gain.
Remember: your ideal weight is the weight you can maintain while living a healthy, enjoyable life. It is not a punishment or a race. It is about finding balance.
No single formula is perfect. The Robinson and Miller formulas are generally considered more accurate for modern populations. We recommend looking at the range across all formulas rather than fixating on one number.
Yes. Muscle is denser than fat, so muscular individuals may weigh more while still being healthy. Ideal weight formulas do not account for muscle mass, so athletes may need to use body fat percentage as a better indicator.
Wrap your thumb and middle finger around your opposite wrist. If they overlap, you have a small frame. If they just touch, medium frame. If they do not meet, large frame.
Not necessarily. The best weight for you is one you can maintain comfortably while feeling energetic and healthy. Many people feel best somewhere in the middle of their range.
Yes. As we age, muscle mass tends to decrease and metabolism slows. Some weight gain in later years is normal and even protective. Older adults may have slightly different healthy ranges than younger adults.