Which formula is most accurate?

No single formula is universally 'correct' — they're estimates derived from mid-20th century population data. Devine is the most widely used in clinical practice for drug dosing.

What's the healthy BMI range?

18.5-24.9 kg/m² is classified as 'normal weight' by the WHO. This range is shown based on your height as a sanity check alongside the formulas.

Why do formulas disagree?

They were developed from different populations and assumptions. Typical spread is ±5-10 lb across formulas — any value in that range is reasonable for an 'ideal'.

Is this medical advice?

No. This tool is for informational purposes only and is not a substitute for advice from a registered dietitian or physician.

Ideal Weight Calculator

Health & Fitness· 18 tools

Free ideal body weight (IBW) calculator. Enter your height and sex — get results from four classic clinical formulas: Devine (1974), Robinson (1983), Miller (1983), and Hamwi (1964), plus a healthy BMI range.

Sex

Units

Height (cm)

Your current weight (kg) (optional)

Devine (1974)

70.5 kg

Robinson (1983)

68.9 kg

Miller (1983)

68.7 kg

Hamwi (1964)

72.0 kg

Healthy BMI range (18.5–24.9)

56.7 kg – 76.3 kg

Informational estimate only. Not medical advice. Formulas are population estimates — individual ideals vary.

Disclaimer: For informational purposes only. This is not medical advice — consult a qualified healthcare provider for personal recommendations.

Frequently Asked Questions

References

Healthy Weight — BMI categories — Centers for Disease Control and Prevention
Body mass index (BMI) — classification — World Health Organization

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Frequently Asked Questions

References and sources

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