Ideal Weight Calculator
Find your ideal healthy weight range using four established medical formulas — Devine, Robinson, Miller and Hamwi — plus the WHO BMI healthy range. Supports metric and imperial heights.
Valid range: 100 – 250 cm
Average across all 4 formulas
For a male of height 170.0 cm (5′7″)
Formula-by-Formula Breakdown
Developed by Dr. B.J. Devine (1974), widely used in pharmacology for drug dosing.
65.9 kg
145.4 lbs
Proposed by Robinson et al. (1983) as a revision to the Devine Formula.
65.2 kg
143.7 lbs
Introduced by Miller et al. (1983), tends to give lower estimates than Devine.
66.0 kg
145.4 lbs
Created by G.J. Hamwi (1964), commonly used by dietitians in clinical practice.
66.7 kg
147.1 lbs
Based on BMI 18.5 – 24.9 for height 170.0 cm (5′7″)
117.9 – 158.6 lbs
Quick Comparison
Devine
65.9 kg
Robinson
65.2 kg
Miller
66.0 kg
Hamwi
66.7 kg
These formulas estimate ideal weight for a person of average build. Athletes with high muscle mass may healthily exceed these ranges. Consult a healthcare professional for personalised guidance.
What is the Ideal Weight Calculator?
The Ideal Weight Calculator estimates a healthy target weight range for your height using several established formulas — including the Devine formula (the one hospitals use for medication dosing) alongside Robinson, Miller and Hamwi variants — so you can see the range across methods rather than relying on a single number.
It also cross-references the result against the WHO healthy BMI range for a second point of comparison.
How to use the Ideal Weight Calculator
- 1Choose your unit system: metric (cm) or imperial (ft-in).
- 2Enter your height and biological sex.
- 3Read the ideal weight estimate from each formula, plus the BMI-based healthy range.
- 4Treat the spread across formulas as a range, not a single target — they can differ by several kilograms.
Key features
- Four established formulas shown side by side (Devine, Robinson, Miller, Hamwi)
- Cross-check against WHO BMI healthy range
- Metric and imperial input
- Separate calculations for men and women
Important notes
- These formulas were developed decades ago on limited population samples and don't account for frame size, muscle mass or body composition — a muscular or large-framed person may sit "above ideal" while being perfectly healthy.
- Treat the output as a general reference point, not a target to hit strictly — a doctor or dietitian can give guidance tailored to your body.
- Devine (1974) is the most cited in clinical drug dosing; Robinson and Miller (1983) revised Devine with smaller increments; Hamwi (1964) tends to estimate higher for tall people.
- The WHO healthy BMI range (18.5–24.9) is calculated from your height alone and does not differentiate by sex — use it alongside the four formulas, not instead of them.
Frequently asked questions
Why do the formulas give different numbers?
Each was derived from a different study population and era — Devine (1974) is used clinically for drug dosing, while Robinson, Miller and Hamwi were built for general population estimates. Differences of a few kilograms between them are normal.
Which formula should I trust most?
Devine is the most widely cited in clinical settings, but no single formula accounts for build or muscle mass — use the range across all four as a general guide.
What is the WHO BMI range shown?
It converts the WHO healthy BMI window (18.5–24.9) into a weight range for your height. Unlike the four named formulas, it does not adjust for sex.
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