"Ideal weight" formulas were originally developed for medical dosing calculations, not as a personal fitness target — but they're still widely used as a general reference point. This calculator uses the Devine formula, one of the most common ideal body weight equations, based on height and sex.
The formula
For a 175 cm (about 68.9 inch) male: 50 + 2.3 × (68.9 − 60) = 50 + 2.3 × 8.9 ≈ 50 + 20.5 = 70.5 kg.
Important context
The Devine formula was created in 1974 specifically to help estimate medication dosing, not as a general fitness or beauty standard. It doesn't account for muscle mass, frame size, or body composition — two people of the same height and sex can have very different healthy weights depending on build. Treat the result as a rough population-level reference point, not a personal target.
Common mistakes
- Treating the number as a strict target. Healthy weight varies by frame size, muscle mass, and individual factors well beyond height and sex alone.
- Using it for children or adolescents. This formula is intended for adults; children need growth-chart-based assessments instead.
This tool is for general information only and is not a substitute for professional medical advice.
Frequently asked questions
What formula does this calculator use?
The Devine formula, one of the most widely used ideal body weight equations, originally developed in 1974 for medical dosing calculations.
Is ideal weight the same for everyone at a given height?
No. The formula gives a population-level reference point; actual healthy weight varies with frame size, muscle mass, and other individual factors.
Should I use this number as a strict target?
No. Treat it as a general reference point to discuss with a healthcare provider rather than a strict personal goal.