Ideal Weight Calculator — How to Estimate Ideal Body Weight
Estimate ideal body weight with Devine, Robinson, Miller, and Hamwi formulas on one page. Example: male 178 cm → Devine about 73.2 kg (range about 70.4–75.2 kg across formulas). Runs in your browser; educational only — not medical advice or a diagnosis.
How it works
Enter sex and height in centimetres. The tool converts height to inches for classic IBW formulas and shows kilograms. Compare formulas on this page; BMI and body-fat tools stay separate.
Formulas and assumptions
Height is converted with 1 in = 2.54 cm. For inches above 60 (5 ft), male Devine = 50 + 2.3×(in−60); female Devine = 45.5 + 2.3×(in−60). Robinson, Miller, and Hamwi use similar linear forms with different coefficients. Assumptions:
- Formulas were derived for adult dosing / reference contexts — not personal goals.
- Frame size, muscle mass, and pregnancy are not modeled.
- Results are educational illustrations, not clinical targets or medical advice.
Example
Example: male, 178 cm → Devine about 73.2 kg; Robinson ~71.1, Miller ~70.4, Hamwi ~75.2 (about 70.4–75.2 kg).
When to use it
- Classwork: compare classic IBW formulas with one height.
- Rough educational reference before talking to a clinician (not a goal plan).
- See Devine vs Robinson on one page without separate tool URLs.
Frequently asked questions
Which ideal weight formula is “correct”?
None is universally correct. Devine is common in teaching; Robinson, Miller, and Hamwi differ by coefficients. Compare them here.
Is this the same as BMI?
No. BMI uses weight and height as a ratio. IBW estimates a reference weight from height and sex only.
Is this medical advice?
No. Numbers are educational estimates only and are not a diagnosis, treatment plan, or nutrition prescription.
Why convert to inches?
Published Devine-style equations are defined in inches above 5 feet. Centimetre inputs are converted before applying the formulas.
Important notice
Ideal weight results are educational illustrations only and are not medical advice, diagnosis, or a substitute for clinical assessment. Talk to a qualified clinician for health decisions.
References: Classic Devine/Robinson/Miller/Hamwi IBW equations; NCBI Bookshelf dosing/IBW educational context.
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Questions or feedback
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