Ideal Weight Calculator
Compare your current weight with two transparent height-based references and find relevant next-step calculators.
Your Ideal Weight Result
Result status:
Practical interpretation
Important: Estimate only—not medical advice.
How the Ideal Weight Calculator works
Formula: Devine: 50 kg male or 45.5 kg female at 5 ft, plus 2.3 kg per inch over 5 ft; BMI reference interval: 18.5 ≤ BMI < 25, with each bound multiplied by height² for weight.
The Devine equation provides one historical reference point. Your current weight is also compared with the broader BMI screening interval to select relevant next-step tools.
Assumptions and limits: “Ideal” weight is not a diagnosis. The Devine formula was originally developed for medication dosing, is limited below 5 ft, and neither reference accounts for body composition or individual health. Results are estimates for education and planning, not medical advice.
How to use your result
Use the result as a starting point, not a pass-or-fail score. Keep your inputs consistent, observe relevant trends over time, and adjust only when the trend—not one day—shows the estimate does not fit your needs.
Body measurements and equation-based targets always contain uncertainty. If your result conflicts with symptoms, a diagnosis, medication guidance, pregnancy needs, an eating-disorder recovery plan, or instructions from your care team, follow your qualified health professional.
Frequently Asked Questions
What does the Ideal Weight Calculator calculate?
It estimates compare the devine reference weight with a bmi-based range. from the information you enter. It is a planning and screening estimate, not a diagnosis or individualized medical prescription.
Which formula does this Ideal Weight Calculator use?
This tool uses Devine: 50 kg male or 45.5 kg female at 5 ft, plus 2.3 kg per inch over 5 ft; BMI reference interval: 18.5 ≤ BMI < 25, with each bound multiplied by height² for weight.. The formula and every adjustment are shown on this page so you can understand the assumptions.
Can I use metric or imperial units?
Yes. Choose metric or imperial before entering body measurements. Imperial values are converted to kilograms and centimeters before the formula runs.
How accurate is this Ideal Weight Calculator?
Population equations provide useful starting estimates but cannot measure your individual physiology. “Ideal” weight is not a diagnosis. The Devine formula was originally developed for medication dosing, is limited below 5 ft, and neither reference accounts for body composition or individual health.
Who should not rely on this result alone?
Children, pregnant or breastfeeding people, competitive athletes with specialized needs, and anyone managing a medical condition should seek advice from a qualified health professional.
How often should I recalculate?
Recalculate when your body weight, activity, goal, or other relevant input changes meaningfully. Small day-to-day fluctuations generally do not warrant a new target.
Why might my result differ from another calculator?
Calculators may use different equations, activity factors, rounding rules, or definitions. Compare the documented methods rather than assuming one number is exact.
Is this result medical advice?
No. This educational estimate cannot account for diagnoses, medications, laboratory results, or clinical fluid and nutrition restrictions. Consult a licensed professional for personal medical advice.
Scientific References
- Gentamicin therapy Drug Intelligence & Clinical Pharmacy (Devine formula origin)
- Body mass index (BMI) World Health Organization
- Body Weight Planner and energy balance information National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)