Find a healthy ideal weight range for your height using several established formulas — Devine, Robinson and a BMI-based range — side by side.
Educational use only. This calculator is a general-purpose tool and does not replace medical advice. If a result surprises you or you have an underlying condition, consult a clinician before acting on it.
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There is no single "ideal weight" number that is right for everyone. Different formulas were designed for different purposes — Devine (1974) and Robinson (1983) were originally built for medication dosing, while the BMI-based range comes from population health data. Each one gives a slightly different answer for the same height, which is itself a useful lesson: ideal weight is a range, not a point.
The Devine formula was the first widely used ideal body weight equation and remains popular in clinical pharmacy. It says: 50 kg + 2.3 kg per inch over 5 feet for men, 45.5 kg + 2.3 kg per inch over 5 feet for women. Robinson updated it in the 1980s with slightly different constants. Neither was designed to be a health target — they were designed to estimate lean body mass for safe drug dosing.
The BMI-based range (BMI 18.5 to 24.9 multiplied by height squared) is the most modern and the one most clinicians refer to when discussing healthy weight ranges. It gives a window rather than a single number, which is closer to how human bodies actually work. Use the spread between the three numbers as a guide rather than a target.
For everyday health, the BMI-based range. The Devine and Robinson numbers are useful in clinical pharmacy but were never designed as patient-facing health targets.
Body composition differs on average — women carry more essential fat (for hormonal function and reproduction) while men typically carry more muscle. Older formulas baked that difference into their constants.
Probably not. Like BMI, these formulas treat all mass as equivalent. If your body fat is low and your training is going well, the number is misleading. Stick with body fat percentage as your gauge.
The Ideal Weight Calculator lives alongside BMI Calculator, Body Fat Percentage Calculator, Smart Calorie Calculator (BMR & TDEE) on the Health & Fitness page. That landing page collects every health & fitness tool Dailiyo publishes, plus the editorial notes on formula sources, review cadence and how each result should (and should not) be interpreted. If a related health & fitness calculation isn't yet in the collection and you'd like to see it, drop a line via the contact page — the editorial team reviews every request and prioritises tools that come up most often in reader questions.