Ideal Weight Calculator — Science-Based Target Weight

Enter your height and sex to see ideal body weight from three clinical formulas — plus the honest healthy-BMI range, which is wider (and kinder) than one magic number.

Quick answer: Free ideal weight calculator: Devine, Robinson and Miller formulas plus the healthy BMI range — get a realistic target weight by height and sex in seconds.

Height (cm)

–Devine formula

–Robinson formula

–Miller formula

–

Healthy BMI range (18.5–24.9)

💡 Reference numbers, not verdicts — composition and fitness matter more than any single target.

How to use

Enter height & sex — metric or imperial, your choice.
See three formulas — Devine (clinical standard), Robinson and Miller variations.
Compare with BMI range — the healthy-BMI band shows how wide “normal” really is.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

“Ideal weight” began as a drug-dosing calculation, not a beauty standard: the Devine formula (1974) still anchors clinical dosing, with Robinson and Miller as refinements. This calculator shows all three for your height and sex, plus the healthy BMI range (18.5–24.9) — which usually spans 15+ kg. Treat the formulas as reference points: body composition, fitness and how you feel beat any single target number.

FAQ

Which formula is “right”?

None is a truth — they were built for drug dosing. Use them as reference points; the healthy-BMI range is the better everyday guide.

Doesn't muscle make these wrong?

Correct — muscular people register “overweight” on BMI. Body composition (see Body Fat Calculator) tells the real story.

Why is the BMI range so wide?

Because healthy bodies genuinely vary — 18.5 to 24.9 BMI at 175 cm is roughly 57–76 kg. That range is a feature, not a bug.

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The complete ideal weight calculator guide

Prefer the long version — a worked example, the mistakes people actually make, and answers to real questions? The blog guide Ideal Weight Calculator — Complete Guide, Mistakes & FAQ covers all of it step by step.

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Ideal Weight Calculator — Science-Based Target Weight

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The complete ideal weight calculator guide