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Body Composition

Healthy Weight Calculator

Find your ideal and healthy body weight range using four validated formulas (Hamwi, Devine, Robinson, Miller) adjusted for sex, height, and frame size. Supports kg/lbs and metric/imperial.

Healthy Weight Calculator

4 formulas · Frame size adjusted

Unit System
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Healthy Weight Range

Ideal weight formulas give a reference point — not a rigid target. Body composition (muscle vs fat) matters far more than the number on the scale. Use these ranges as a starting-point guide rather than an absolute goal, especially if you're an athlete or have a naturally large frame.

Ideal Weight Formulas Compared

FormulaMen (Base)Women (Base)Per cm above 152cm
Hamwi48.0 kg45.5 kg+2.7 / +2.2 kg
Devine50.0 kg45.5 kg+2.3 kg / both
Robinson52.0 kg49.0 kg+1.9 / +1.7 kg
Miller56.2 kg53.1 kg+1.41 / +1.36 kg

Which Formula to Use and Why

None of the four ideal weight formulas are definitively superior to the others. They were each developed for different clinical purposes: the Devine formula was originally developed for drug dosing, not fitness; Hamwi is used in dietetics; Robinson and Miller are minor statistical refinements. The BMI-based range (18.5–24.9 kg/m²) is probably the most widely understood reference point for general communication. For athletes with high muscle mass, all formula outputs will be lower than a realistic healthy competition weight.

Frequently Asked Questions

Use the healthy weight range as a rough starting reference. For general health, aim to be within the BMI 18.5–24.9 corresponding range for your height. For athletic goals (muscle building), your target weight may legitimately exceed the range due to higher lean mass. For fat loss, aim to lose fat (measured by body fat %) rather than just weight — losing muscle to hit a number on a chart is counterproductive.
The Devine formula is most widely used in clinical settings (especially for drug dosing calculations). The Hamwi formula is standard in dietetics and clinical nutrition. For general fitness use, the BMI-based range (18.5–24.9 kg/m²) is probably the most intuitive as it directly ties to research on health risk.
The standard BMI-based range doesn’t change with age, but some research suggests that slightly higher BMI (25–27) may be protective in older adults (65+) due to greater muscle reserves during illness. For children and adolescents, age-adjusted BMI percentiles are used rather than the adult thresholds. The formulas in this calculator are designed for adults only.
The physical weight is identical — only the unit label changes. For example, 70 kg = 154 lbs; the calculator automatically converts. Select Metric (kg/cm) or Imperial (lbs/ft⋅in) from the toggle and enter your height and weight in your preferred units. The result is converted back to your selected unit system for the output.

Related Calculators

BMI CalculatorBody mass index from height and weight.Calculate → Frame Size CalculatorSmall, medium, or large frame from wrist and height.Calculate → Body Fat CalculatorEstimate body fat percentage.Calculate → Ponderal Index CalculatorMore accurate than BMI for tall/short individuals.Calculate →