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Ideal weight calculator by height, sex and age

Enter your height and sex — the calculator shows your healthy weight range by WHO BMI and, for comparison, estimates from the classic ideal-weight formulas. The honest key point: there is no single "ideal weight" number — a whole range is healthy, and within it much depends on body composition and frame.

Calculate ideal weight

Sex

Enter your height and pick a sex — the healthy range appears instantly.

What counts as a healthy weight

Adult guides by WHO BMI. A range, not a single number: an athletic build shifts the norm upward due to muscle mass.

BMI, kg/m²Weight assessment
below 18.5Underweight
18.5–24.9Healthy weight
25.0–29.9Overweight
30 and aboveObesity

Is there such a thing as "ideal weight"

Strictly speaking — no. A whole range of weight is healthy for your height, not a single point. So the calculator shows first the healthy weight corridor by body mass index (BMI 18.5–24.9) — the evidence-based reference from the World Health Organization.

Within the range there is a realistic target (BMI about 22–25) — the zone associated with the lowest mortality in large studies. But even that is not dogma: for a muscular person the healthy weight shifts toward the upper bound, because muscle is heavier than fat.

The classic ideal-weight formulas

The Devine (1974), Robinson (1983), Miller (1983) and Hamwi (1964) formulas estimate "ideal weight" from height and sex. It is important to understand their nature: they were originally formulas for drug dosing, not recommendations for what weight to aim for. They ignore body composition and usually give values in the lower half of the healthy range.

That is why we show them for reference and average them — as one more guide, not a target. In practice it is more reliable to rely on the BMI range and how you feel.

Why body composition matters

The number on the scale does not tell muscle from fat. Two people of the same height and weight can look and be healthy in different ways. So "healthy weight" is better assessed together with body fat percentage and waist circumference, not by a single figure.

If you know your wrist circumference, the calculator refines the corridor with a frame adjustment (small, medium or large bone). To assess body composition, see the body fat calculator.

Frequently asked questions

  • The most reliable way is the healthy BMI range: multiply 18.5 and 24.9 by your height in metres squared. For 180 cm that is about 60–81 kg. The calculator does this instantly and adds estimates from the classic formulas (Devine, Robinson, Miller, Hamwi) for comparison.

  • Because they were derived in different years and for different purposes (mostly drug dosing). Devine, Robinson, Miller and Hamwi use different coefficients, so results differ by a few kilograms. That is normal: none of the formulas is "the one true" answer — aim for the range, not a point.

  • In adults, the classic formulas and the BMI range do not depend on age. What changes with age is body composition (less muscle, more fat at the same weight), so for older adults it is sensible to aim for the upper part of the healthy range and watch muscle mass rather than chase a "young" weight.

  • Yes, that happens: BMI and formulas cannot tell muscle from fat, so for athletic people they may show "excess". Rely on body fat percentage and waist circumference — they are more accurate. Enter your wrist circumference to get a frame adjustment.

  • A realistic goal within the healthy range, not the "minimum" weight. Rapid weight loss to the lower bound often does harm. If you need help with a plan, that is a question for a doctor or dietitian; the calculator only shows guides.

Weight is only part of the health picture

Upload your labs (glucose, lipids, hormones) — AI links them to your weight and body composition and tells you what to watch.

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This calculator is for informational reference only and is not a diagnosis or a weight-loss programme. Discuss your weight goal and how to reach it with a doctor or dietitian.