Ideal Weight Calculator
See your ideal weight range across 5 medical formulas - and exactly where you stand on the spectrum.
cm
kg
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These formulas are statistical guidelines, not medical prescriptions. Consult a healthcare provider for personalized advice.
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Lemon helps you build the specific habits that close the gap - personalized nutrition, movement, and health nudges built around your actual body and lifestyle.
FAQ
Common questions about ideal weight
Your ideal weight depends on your height and sex, and varies slightly by formula. The Devine, Hamwi, Robinson, and Miller formulas typically agree within a 5–10 kg range. The BMI-based range (18.5–24.9 × height²) is broader. Use the calculator above to get your exact range across all 5 methods.
No single formula is definitively most accurate - each was developed for different clinical populations. The Devine formula (1974) is widely used in pharmacology. Hamwi (1964) is common in nutrition. Robinson and Miller (both 1983) are revisions of Devine. The BMI range is the most flexible. This calculator shows all five so you can see the consensus zone rather than trusting one number.
Yes. All five formulas produce different results for men and women at the same height. Men generally have a higher ideal weight because they tend to carry more muscle mass and have denser bone structure. For example, at 5'10" (177 cm), the Devine formula gives about 71.5 kg for men and 65.5 kg for women.
They serve different purposes. BMI tells you your current weight-to-height ratio and categorizes your present status. Ideal weight formulas provide a target range to aim for. Ideal weight is more useful as a goal; BMI is better for tracking current status. Neither accounts for body composition - a muscular person may exceed the ideal weight range but have very healthy body fat levels.
Ideal weight formulas don't account for muscle mass and are less meaningful for highly muscular people. A trained athlete may weigh significantly above the formula's ideal yet be in excellent health. Body fat percentage is a more meaningful metric for athletes. If you carry significant muscle, your personal ideal weight is likely higher than these formulas suggest.
If you're above your ideal range, a safe loss rate is 0.5–1 kg per week via a 500 kcal/day deficit below your TDEE. If you're below your ideal range, a 300–500 kcal surplus focused on protein-rich foods and strength training will help build lean mass. Avoid rapid changes in either direction - they tend to backfire and are difficult to maintain.
The standard ideal weight formulas don't factor in age - they're based on height and sex only. However, research suggests slightly higher body weight in older adults (60+) may protect against frailty and illness. Some clinicians use a modified BMI target of 23–30 for older adults instead of the standard 18.5–24.9.
Yes. AI health apps like Lemon Health can identify the specific habits that close the gap between your current weight and your ideal range. Rather than generic advice, Lemon surfaces which changes in your daily routine - meals, movement, sleep - will have the highest impact for your body and lifestyle, making the journey sustainable rather than overwhelming.