How is ideal weight calculated?

Four formulas are shown: Hamwi (1964), Devine (1974), Robinson (1983) and Miller (1983). All adjust for height and sex. The average of all four gives a more robust estimate.

Is there one universal 'ideal' weight?

No. Ideal varies by frame size, muscle mass, age and ethnicity. Use these formulas as benchmarks alongside BMI, body-fat percentage and waist measurement.

Why are there different formulas?

Each was developed in a different decade with different reference populations. Devine and Robinson are most cited in medical dosing; Hamwi and Miller are used in general wellness.

⚖️ Ideal Weight Calculator

Calculate your ideal body weight using four established formulas and a healthy BMI range. All calculations run in your browser — no data stored.

Sex

Unit System

Height (cm)

Current Weight (kg) optional

About This Calculator

The Ideal Weight Calculator computes ideal body weight (IBW) using four well-known clinical formulas. All formulas take height as input and were originally developed for estimating drug dosages in clinical settings.

Formulas Used

Hamwi (1964) — Men: 48 kg + 2.7 kg per inch over 5 ft

Hamwi (1964) — Women: 45.5 kg + 2.2 kg per inch over 5 ft

Devine (1974) — Men: 50 kg + 2.3 kg per inch over 5 ft

Devine (1974) — Women: 45.5 kg + 2.3 kg per inch over 5 ft

Robinson (1983) — Men: 52 kg + 1.9 kg per inch over 5 ft

Robinson (1983) — Women: 49 kg + 1.7 kg per inch over 5 ft

Miller (1983) — Men: 56.2 kg + 1.41 kg per inch over 5 ft

Miller (1983) — Women: 53.1 kg + 1.36 kg per inch over 5 ft

The healthy BMI range (18.5–24.9) is the most widely accepted standard across healthcare organisations and provides a weight range rather than a single target number.

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Important Note: This tool is intended to provide estimates and should not be used as a substitute for professional advice. Information generated by these calculators may be incomplete and does not account for all individual circumstances. Always seek the counsel of a certified expert (such as a financial advisor, healthcare provider, or licensed engineer) before taking action based on these results.

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