Calculate your ideal body weight using multiple scientifically-validated formulas based on height, gender, and age
Enter your details and click calculate to see your ideal weight range
Ideal body weight (IBW) represents the optimal weight range for a person based on height, gender, and sometimes age or body frame. These calculations were originally developed for medical purposes, particularly for determining appropriate medication dosages, but have become widely used as general health guidelines.
It's important to understand that "ideal weight" is not a single fixed number but rather a range. Different formulas produce slightly different results because they were developed by different researchers using various populations and methodologies. Your ideal weight also depends on factors beyond height and gender, including muscle mass, bone density, body composition, and individual health conditions.
This calculator uses multiple established formulas to provide a comprehensive range of ideal weights. Viewing results from several methods helps you understand that there isn't one "perfect" weight, but rather a healthy range that accommodates individual variation. Use these calculations as general guidelines rather than absolute targets, and always consider your overall health, body composition, and how you feel.
| Formula | Men | Women | Notes |
|---|---|---|---|
| Devine Formula (1974) | 50 kg + 2.3 kg per inch over 5 ft | 45.5 kg + 2.3 kg per inch over 5 ft | Most widely used, originally for drug dosing |
| Hamwi Formula (1964) | 48 kg + 2.7 kg per inch over 5 ft | 45.5 kg + 2.2 kg per inch over 5 ft | Used in clinical nutrition |
| Robinson Formula (1983) | 52 kg + 1.9 kg per inch over 5 ft | 49 kg + 1.7 kg per inch over 5 ft | More recent refinement |
| Miller Formula (1983) | 56.2 kg + 1.41 kg per inch over 5 ft | 53.1 kg + 1.36 kg per inch over 5 ft | Alternative modern formula |
| BMI-Based (20-25) | Weight for BMI 20-25 range | Based on healthy BMI range | |
Body Frame Size: People with larger frames (thicker bones, broader shoulders) naturally weigh more than those with smaller frames at the same height. A simple test: wrap your thumb and middle finger around your wrist. If they don't touch, you likely have a large frame. If they touch, medium frame. If they overlap, small frame. Adjust your target weight upward for large frames and downward for small frames by approximately 10%.
Muscle Mass: Muscle weighs more than fat tissue by volume. Athletic individuals and those who resistance train regularly may weigh more than formulas suggest while having excellent body composition. For these individuals, body fat percentage or body composition measurements provide better assessment than weight alone.
Age: Body composition naturally changes with age. Muscle mass decreases (sarcopenia) while fat mass tends to increase even if weight remains stable. Older adults may have higher healthy weight ranges than younger adults. Some experts suggest allowing 1-2 kg additional weight per decade after age 40.
Ethnicity: Research shows that the relationship between weight, height, and health outcomes varies across ethnic groups. Asian populations, for example, may have higher health risks at lower BMI values compared to Caucasian populations. Consider ethnicity-specific guidelines when available.
Health Conditions: Certain medical conditions affect ideal weight recommendations. Chronic diseases, metabolic disorders, thyroid conditions, and medications can all influence what weight range is healthiest for an individual. Always consult healthcare providers about appropriate weight goals if you have health conditions.
The calculator provides multiple ideal weight estimates. Use these as guidelines to understand your healthy weight range. If results vary significantly between formulas, consider the middle range as your target. Remember that these are population-based estimates—your personal ideal weight depends on your individual body composition, health status, and fitness goals.
Ideal weight formulas have significant limitations. They don't account for muscle mass, bone density, body composition, or individual health factors. A bodybuilder and a sedentary person of the same height will have very different healthy weights despite formulas suggesting the same ideal weight. Use these calculations as general guidelines, not absolute targets.