Free Ideal Weight Calculator
Enter your height and gender to get evidence-based ideal weight estimates from the Devine and Robinson formulas — shown in kg and lb, alongside the healthy BMI range for your height.
How to Use the Ideal Weight Calculator
- Choose units and enter your height.
- Select gender and formula (or show both).
- Click Calculate Ideal Weight for the healthy range.
Features
Implements both classic medical formulas with correct gender constants, converts between cm/inches seamlessly, and adds the BMI 18.5–24.9 band as a reality check.
Benefits & Use Cases
People setting weight-loss targets get a science-based goal range, and clinicians use these formulas for quick reference (they originated for medication dosing).
Tips
These are population estimates, not personal prescriptions — frame size, muscle mass and age shift your ideal. Treat the range as a starting point for a conversation with your doctor.
Frequently Asked Questions
What is the Devine formula?
For men: 50 + 2.3 × (inches over 5 ft); for women: 45.5 + 2.3 × (inches over 5 ft). Originally created for drug dosing.
Devine vs Robinson — which is right?
Both are estimates from the 1970s–80s; Robinson’s variant is slightly lower for men. The tool shows both so you can see the range.
Do these work for very tall or short people?
Accuracy fades at extremes — the formulas assume average builds near 5–6 ft.
Is ideal weight the same as healthy weight?
Roughly — but health depends on composition, fitness and medical history, not just the scale.
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