Ideal Weight Calculator
This calculator is for informational purposes only and is not a substitute for professional medical advice. Consult a healthcare provider for personal health decisions.
Multiple clinical formulas based on height and gender
How Ideal Weight Estimates Work
Ideal body weight formulas provide reference targets based on height and sex — not a single perfect number, but a reasonable range for healthy adults. The Robinson formula (1983) is commonly used in clinical settings. For men: ideal weight (kg) = 52 + 1.9 × (height in inches − 60). For women: ideal weight (kg) = 49 + 1.7 × (height in inches − 60). These build on the Devine formula (1974), which uses coefficients 50/45.5 and 2.3 kg per inch above 5 feet for men and women respectively.
Convert 175 cm to inches: 175 ÷ 2.54 ≈ 68.9 inches. For a man: Robinson ideal = 52 + 1.9 × (68.9 − 60) = 52 + 1.9 × 8.9 = 52 + 16.9 ≈ 69 kg. The Devine formula gives 50 + 2.3 × 8.9 ≈ 70 kg. Miller yields about 68 kg and Hamwi about 71 kg. Presenting all four produces a range of roughly 68–71 kg for this height — a span of a few kilograms that reflects formula variation, not measurement error.
These formulas were originally developed to estimate drug dosing and ventilator settings, not to define aesthetic ideals. They assume average frame sizes and do not account for muscle mass, bone density, or ethnicity. A fit athlete at 80 kg and 175 cm may be well above "ideal" by formula yet healthier than a sedentary person at 69 kg with low muscle and high body fat.
A practical approach pairs ideal weight with BMI. For a given height, the BMI normal range (18.5–24.9) translates to a weight span. At 175 cm, normal BMI corresponds to roughly 56.7–76.3 kg — wider than any single formula suggests. Use ideal weight formulas as one data point alongside BMI, body fat percentage, waist circumference, and how you feel and perform physically.
This calculator returns estimates from multiple established formulas so you can see a consensus range rather than relying on one equation. Compare the result to your current weight and BMI to set realistic, health-focused goals rather than chasing an arbitrary single number.
Examples
| Example | Result |
|---|---|
| Male, 175 cm | Ideal range ~68–71 kg (Robinson ~69 kg) |
| Female, 165 cm | Ideal range ~57–60 kg (Robinson ~58 kg) |
| Male, 180 cm | Ideal range ~72–76 kg |
| Female, 160 cm | Ideal range ~53–56 kg |
| Male, 170 cm | Ideal range ~64–67 kg |
| Female, 170 cm | Ideal range ~61–64 kg |
| Male, 190 cm | Ideal range ~79–83 kg |
| Female, 155 cm | Ideal range ~50–53 kg |
Frequently asked questions
No single formula is best for everyone. Robinson and Devine are widely used clinically. Compare multiple results and focus on the overlapping range.
No. These formulas estimate based on height and sex only. Muscular individuals may weigh more than the calculated ideal while still being healthy.
Ideal weight formulas often land near the middle of the normal BMI range for a given height, but BMI gives a wider acceptable span of roughly 18.5–24.9.