Ideal Weight Calculator
This ideal weight calculator estimates a healthy body weight based on your height and sex. Because there is no single agreed definition of "ideal weight", it shows the result from four widely used clinical formulas — Devine, Robinson, Miller, and Hamwi — so you can see the range they produce rather than a single number. It also displays the healthy weight range that corresponds to a normal body mass index. Use it as a general reference point for setting realistic goals, not as a medical diagnosis.
Estimated ideal weight
Devine formula
Robinson formula
Miller formula
Hamwi formula
Healthy range (BMI 18.5–24.9)
Ideal weight is only a rough estimate: it does not distinguish muscle mass, fat, or bone frame. Consult a health professional for a personalized assessment.
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How it works
Each formula starts from a baseline weight for a person 5 feet (152 cm) tall and adds a fixed amount for every inch above that height, with different constants for men and women. Devine, Robinson, Miller, and Hamwi were all derived from population data and give slightly different figures, which is why we show all four. In addition, the calculator computes the healthy weight range by applying the World Health Organization normal BMI band, from 18.5 to 24.9, to your height: weight equals BMI times height in metres squared. Together these give a sensible window rather than one exact target.
Approximate ideal weight by height
The table shows the weight the two most widely used clinical formulas — Devine and Robinson — return for several heights, split by sex. Notice how the two methods agree to within a couple of kilograms around average heights and drift apart at the extremes: that gap is exactly why no single figure should be treated as "the" ideal weight. Find the row closest to your height for a quick reference, and remember that a difference of a few kilograms up or down is entirely normal and healthy.
| Height | Devine (male) | Devine (female) | Robinson (male) | Robinson (female) |
|---|---|---|---|---|
| 150 cm | 48 kg | 43 kg | 50 kg | 47 kg |
| 160 cm | 57 kg | 52 kg | 58 kg | 54 kg |
| 170 cm | 66 kg | 61 kg | 65 kg | 61 kg |
| 180 cm | 75 kg | 70 kg | 73 kg | 68 kg |
| 190 cm | 84 kg | 79 kg | 80 kg | 74 kg |
Why "ideal weight" is only a guide
These formulas were built decades ago to help doctors dose medication, using only height and sex. They cannot see your muscle mass, your body-fat percentage, or your bone frame, so two people the same height can be equally healthy several kilograms apart. A muscular athlete may sit well above the estimate without any excess fat, while a sedentary person inside the range can still carry too much. Read the figure alongside your BMI, waist circumference, and — if you can measure it — your body-fat percentage, and use frame size (small, medium, or large) to adjust your expectations. Treat it as a reference point, never a diagnosis, and talk to a health professional before setting a weight goal.
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Preguntas frecuentes
- What is ideal body weight?
- Ideal body weight is an estimate of a healthy weight for a person of a given height and sex. It was originally developed to help calculate medication doses, and later adopted as a general health reference. It is not a strict target: healthy people can weigh above or below it depending on muscle mass, build, and body composition.
- Why do the four formulas give different results?
- Devine, Robinson, Miller, and Hamwi were each derived from different population samples and assumptions, so they produce slightly different numbers for the same height. Showing all four gives you a realistic range instead of a single, falsely precise figure. The healthy BMI range often brackets these values.
- Which formula should I use?
- There is no single best formula. The Devine formula is the most widely used in clinical settings and is shown here as the headline result. If you want a broader view, compare it with the Robinson, Miller, and Hamwi values and with the healthy BMI range, and treat the whole span as your target zone.
- Does ideal weight account for muscle or body fat?
- No. These formulas use only height and sex, so they cannot tell muscle from fat. A very muscular athlete may weigh more than the estimate while being perfectly healthy, and someone within the range can still have too much body fat. Combine the result with measures like body fat percentage or waist circumference.
- Is the healthy weight range the same as ideal weight?
- Not exactly. The healthy range comes from applying the normal BMI band (18.5 to 24.9) to your height, giving a lower and upper weight. The formula-based ideal weight is usually a single value within that range. Staying anywhere inside the healthy range is generally considered fine.