Use our Ideal Weight Calculator to estimate a healthy weight range for your height and frame size. This tool applies four respected formulas — Devine, Hamwi, Robinson, and Miller — to give you an at-a-glance comparison and a simple average. Whether you prefer metric or imperial units, you will get clear, easy-to-read results in kilograms, pounds, or both.
What the Ideal Weight Calculator estimates
Ideal weight is a statistical estimate of a body weight that may be associated with good health for a given height. Because people vary in bone structure, muscle mass, age, and lifestyle, no single number is perfect for everyone. Instead, this calculator provides several evidence-based estimates, plus an average, so you can see how different methods line up. You can also select a frame size adjustment (small or large) to slightly decrease or increase the results, reflecting differences in body build.
How the Ideal Weight Calculator works
- Inputs your height in centimeters or feet and inches.
- Accounts for sex, which each formula uses to set its baseline.
- Optionally applies a small frame-size adjustment (?10% for small, +10% for large, 0% for medium).
- Calculates four estimates: Devine, Hamwi, Robinson, and Miller.
- Displays each result and a simple average in kilograms, pounds, or both.
How to use the calculator
- Select your unit system (metric or imperial).
- Enter your height. In metric, provide centimeters only. In imperial, enter feet and inches.
- Choose your sex.
- Pick a frame size if you know it; otherwise, leave Medium.
- Select the output units you prefer (kg, lb, or both) and press Calculate.
For the most accurate results, measure your height without shoes, standing straight against a wall, and look forward to keep your head level. If you are between two values, rounding to the nearest half inch or centimeter is fine.
Formulas explained
- Devine: Commonly used in clinical settings to estimate medication dosages and ideal weight from height and sex.
- Hamwi: An older method often presented with frame-size adjustments, which this calculator supports.
- Robinson: A refinement intended to better match observed population data for adults.
- Miller: Another refinement that slightly differs in per-inch adjustments, providing a helpful comparison point.
Each formula starts from a baseline at five feet (152.4 cm) and adds or subtracts a small amount for each inch above or below that height. Because they use different baselines and per-inch adjustments, your results will vary slightly between formulas. The average gives a simple single number to reference.
What ideal weight does and does not mean
Ideal weight estimates are not a diagnosis and do not capture the full picture of health. Muscle mass, bone density, fat distribution, age, ethnicity, and medical history all matter. For example, strength athletes often exceed ideal weight estimates because muscle is dense, yet they may have excellent metabolic health. Conversely, someone inside an ideal weight range might still benefit from lifestyle changes based on their individual risk factors.
Tips for interpreting your result
- Use the number as a starting point, not a strict target.
- Consider the range across formulas rather than focusing on a single value.
- Track trends over time alongside other measures like waist circumference, fitness, and how you feel day to day.
- Consult a healthcare professional for personalized advice, especially if you have a medical condition, are pregnant, or are under 18.
Why multiple methods are helpful
No single formula fits every body. By showing four established approaches side by side, the Ideal Weight Calculator offers a more balanced view. If three formulas cluster tightly and one differs, that outlier may simply reflect how its coefficients were derived. The average smooths out these differences and is useful for setting broad goals alongside guidance from a clinician or coach.
Next steps
After you find your estimated ideal weight, pair the result with achievable habits: balanced nutrition, regular physical activity, good sleep, and stress management. If you want more precision, consider body composition testing or speak with a registered dietitian or healthcare provider. The Ideal Weight Calculator is a helpful guidepost on the path to better health, not a final destination.