Ideal Weight Calculator
What should you weigh? There’s no single perfect number, but the Devine formula — originally developed for medication dosing — gives a sensible target range used by clinicians worldwide.
Based on the Devine formula ± 10%. Muscular builds may healthily exceed this range.
The Devine formula
Women: 45.5 kg + 2.3 kg per inch over 5 feet
We show ±10% around the formula’s midpoint, which comfortably covers different frame sizes. It aligns closely with the middle of the healthy BMI range (18.5–24.9).
Take it as a range, not a verdict
Frame size, muscle mass, and age all shift where you feel and perform best. Use this as a ballpark for goal-setting — then let energy, strength, and how your clothes fit have the final vote.
Frequently asked questions
What is ideal body weight?
A reference weight range for a given height, originally derived for drug dosing. It’s a guideline — not a medical requirement.
Is the Devine formula accurate?
It’s a reasonable population reference that tracks the healthy BMI range well. Individuals with lots of muscle or small frames will differ.
Should I aim for the middle of the range?
Not necessarily. Anywhere inside the range is fine — pick the weight where your energy, strength, and health markers look best.
I’m muscular and above the range — is that bad?
Probably not. The formula assumes average muscularity. If your body fat percentage is healthy, extra muscle weight is a good thing.
How fast can I reach my ideal weight?
A sustainable rate is 0.5–1% of body weight per week. Faster usually costs muscle.