Ideal Weight Calculator
Estimate your ideal body weight from height and sex using the Devine, Robinson, Miller and Hamwi formulas.
Tip: Use the average of the four formulas as a rough guide. Body frame, muscle mass and age also matter, so treat the result as a range rather than an exact target.
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About this digital tool
An ideal weight calculator estimates a body weight that is commonly considered appropriate for a given height and sex. This tool uses four well-known formulas: Devine, Robinson, Miller and Hamwi. Each one starts from a base weight for 152.4 cm (5 feet) and adds a fixed amount for every centimetre above that height, with slightly different constants for men and women. Because the formulas were developed in different studies, they give slightly different answers, and showing all four helps you see a realistic range. The results do not take into account muscle mass, body composition, bone structure or age, so they should not be read as a single target. For a more complete picture, combine the ideal weight with your body mass index and waist measurement, and speak with a clinician before making major changes.
How to use
- Choose your sex.
- Enter your height in centimetres.
- Read the ideal weight from each of the four formulas.
- Use the range between the lowest and highest values as a guide.
Frequently asked questions
What is the Devine formula?
Devine (1974) estimates ideal weight as 50 kg for men or 45.5 kg for women at 152.4 cm, plus 0.91 kg for each extra centimetre. It is one of the most widely used formulas in clinical settings.
Why do the four formulas give different results?
Each formula came from a different study and population. Robinson, Miller and Hamwi use different constants, so their outputs vary by a few kilograms for the same height.
Is ideal weight the same as a healthy weight?
Not exactly. Ideal weight is a formula-based estimate. A healthy weight also depends on body composition, waist size, fitness and health history, so it is best assessed with a professional.
Does frame size matter?
Yes. People with a larger frame often weigh more while still being healthy. The formulas do not measure frame size directly, so use your judgement and a clinician's advice.