Ideal Weight Calculator

Compare adult weight estimates from Devine, Robinson, Miller, and Hamwi. These are reference calculations, not personal weight goals.

Ideal Weight Calculator

Gender

Height

Understanding Ideal Body Weight

This tool compares unadjusted historical formulas for adults at least 152.4 cm (5 ft) tall. It does not extrapolate below that height or apply a frame-size multiplier.

How we calculate

Height is converted to inches using 1 inch = 2.54 cm. Each equation adds an increment for every inch above 60. Hamwi is calculated in pounds, then converted to kilograms using 1 lb = 0.45359237 kg. Rounding happens only when displaying results.

Example: 177.8 cm (5 ft 10 in)

Formula	Male equation	Female equation
Devine	73.0 kg	68.5 kg
Robinson	71.0 kg	66.0 kg
Miller	70.3 kg	66.7 kg
Hamwi	75.3 kg	68.0 kg

For example, Devine's male equation gives 50 + (2.3 × 10) = 73 kg. The range displayed above collects the lowest and highest outputs; it is not a clinical recommendation.

Sources and limitations

Peterson et al. (2016), Table 1 compares these equations and discusses their limitations. The historical methods do not establish one universally appropriate weight. Robinson et al. (1983) describes development for drug-dosage calculations; this consumer tool must not be used to calculate medication doses.

Disclaimer: This calculator is for informational purposes only and is not a substitute for professional medical advice. Always consult a healthcare provider for personalized health assessments.

Frequently Asked Questions

What does this calculator show?

It compares four historical height-based weight estimates. The range is simply the smallest and largest result, not a prescribed healthy-weight interval.

Why do the formulas give different results?

They use different starting weights and increments per inch. Their order can change with height; Miller is not always the lowest and Robinson is not always higher than Devine.

Does the calculator adjust for frame size?

No. We show the unadjusted equations. Applying a blanket 10% change to every formula would alter the methods being compared.

Can I use this as my target weight?

No. These adult reference estimates do not assess your individual health or body composition. This tool is not intended to set weight goals for children, pregnancy, or medication dosing. Discuss a personal goal with a qualified healthcare professional.

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