Ideal Weight Calculator
Compare five major formulas — Devine, Robinson, Miller, Hamwi, and BMI-based — to find your ideal body weight range.
Formulas Used
All formulas use height in inches over 5 feet (60 inches). Frame size adjusts the base result by ±10%.
| Formula | Year | Men | Women |
|---|---|---|---|
| Devine | 1974 | 50 + 2.3 × in | 45.5 + 2.3 × in |
| Robinson | 1983 | 52 + 1.9 × in | 49 + 1.7 × in |
| Miller | 1983 | 56.2 + 1.41 × in | 53.1 + 1.36 × in |
| Hamwi | 1964 | 48 + 2.7 × in | 45.5 + 2.2 × in |
| BMI-based | — | 21.75 × m² | 20.75 × m² |
Why the Ideal Weight Calculator is Useful
A single number labelled "ideal weight" can be misleading — different medical formulas were developed on different populations in different decades, which is why the results often disagree. Instead of guessing which formula applies to you, this calculator runs all five major formulas simultaneously and displays the full range. You get honest context: a realistic band of healthy weights rather than a single figure that may not account for your bone structure, muscle mass, or body type.
Key Features
- Five formulas simultaneously: Devine, Robinson, Miller, Hamwi, and BMI-based results shown side by side
- Gender-specific calculations: Each formula uses separate constants for male and female physiology
- Body frame adjustment: Small (−10%), Medium (baseline), and Large (+10%) frame options adjust every formula result
- Metric and imperial: Enter height in cm or feet/inches; view results in both kg and lbs
- Current weight comparison: Enter your current weight to see a visual bar showing where you fall within the ideal range
- Combined range summary: A single headline range derived from all five formulas for easy reference
Real-Life Use Cases
- Setting a realistic weight loss or gain goal that accounts for your height, gender, and frame size
- Healthcare professionals referencing ideal body weight for drug dosing calculations (Devine formula is standard in pharmacology)
- Athletes checking if their current weight is within a healthy range given their build
- Filling in insurance or fitness assessment forms that ask for ideal weight estimates
- Personal trainers explaining healthy weight ranges to clients without relying on a single arbitrary formula
Who Can Use This Tool
Anyone curious about healthy weight guidelines — fitness beginners, healthcare students, personal trainers, nutritionists, and people tracking long-term weight management progress. It is also useful for parents checking growth reference points for teenagers, and for professionals who need a quick clinical reference for IBW-based calculations.
Tips & Best Practices
- Use the range, not a single number — the band between the lowest and highest formula result is your realistic target zone
- Measure your wrist circumference against standard charts to determine whether your frame is small, medium, or large before choosing
- If you are very muscular or an athlete, all formulas will underestimate your healthy weight — consider body fat percentage testing instead
- Pair this tool with the BMI Calculator to get a broader picture of where you stand on standard health indices
- Do not use ideal weight targets as the sole basis for health decisions — consult a doctor or registered dietitian for personalised advice