Ideal Weight Calculator
Find your ideal body weight using Hamwi, Devine, Robinson and Miller formulas plus a healthy BMI range.
Last updated: August 2026
Hamwi (1964)
66.7 kg
Devine (1974)
65.9 kg
Robinson (1983)
65.2 kg
Miller (1983)
66 kg
Healthy BMI range
53.5 – 72.3 kg
WHO BMI 18.5–25
Ideal body weight (IBW) formulas were created for medical dosage, not looks. They ignore body fat and muscle, so a muscular person can be “overweight” and perfectly healthy. These are reference points, not targets.
How it works
Devine male: 50 kg + 2.3 kg/inch over 5 ft. Devine female: 45.5 kg + 2.3 kg/inch over 5 ft. Healthy BMI 18.5–25.
Example: 170 cm (5 ft 7 in) male → Devine ≈ 66.1 kg.
Frequently Asked Questions
What is the ideal weight formula?
For men, Devine: 50 kg + 2.3 kg per inch over 5 feet. For women, Devine: 45.5 kg + 2.3 kg per inch over 5 feet. Hamwi, Robinson and Miller are similar formulas with different base weights — this calculator shows all four.
Is ideal body weight the same as a healthy weight?
Not exactly. IBW formulas were created for medical dosage calculations and ignore body fat, muscle and frame size. The healthy BMI range (18.5–25, or 18.5–23 for Asian cutoffs) is a broader and more useful guide.
Why do the four formulas give different results?
Each formula was derived from different study populations. Devine tends to give the highest values, Robinson the lowest, with Hamwi and Miller in between. Differences are usually a few kilograms.
Can a muscular person be above their ideal weight and still be healthy?
Yes. All these formulas assume average muscle mass. Athletes and bodybuilders can exceed the number while having low body fat — which is why IBW should not be treated as a strict target.