Is this healthy weight calculator free?

Yes. Calculate your healthy weight range with no registration.

Which formulas are supported?

WHO BMI, Hamwi, Devine, and Robinson ideal body weight formulas.

Are results medically accurate?

Yes. Based on clinical standards and WHO guidelines for healthy BMI ranges.

Do you store height data here?

No. All calculations happen locally with complete privacy.

Clinical Ideal Weight & BMI Formulations

Healthy Weight Calculator

Estimate your ideal body weight range based on height, gender, and clinical formulations. Compare Robinson, Devine, Miller, and Hamwi equations alongside WHO guidelines.

Scenarios:

Unit System

Biological Parameters

Gender

Height

Current Weight

Anatomical Limit Warning

Standard IBW formulas are based on statistical population tables. They do not account for muscle mass vs. fat composition. Athletes or individuals with high athletic builds may register as "Overweight" despite minimal adipose tissue.

Body Mass Index (BMI)

kg/m²

Normal Weight

Healthy Weight Range

50.4 kg – 67.8 kg

For normal BMI (18.5 – 24.9)

Target Adjustment

Lose 0.2 kg

To reach upper healthy limit

Underweight (18.5)Healthy (24.9)Overweight (29.9)Obese (30+)

Diagnostic Report Summary

For a female of your height (165 cm), the medically recommended healthy weight range is 50.4 kg to 67.8 kg. Your current weight of 68 kg puts you slightly above the healthy range (BMI 25). Your weight adjustment target is to lose 0.2 kg to enter the normal BMI zone. Your estimated clinical Ideal Body Weight (IBW) based on the standard Devine formula is 56.9 kg.

Model Estimations vs. Current Weight

68 kg

56.9 kg

56.9

57.4 kg

57.4

59.8 kg

59.8

56.4 kg

56.4

CurrentDevineRobinsonMillerHamwi

Scientific Formulation Comparison

Equation	Ideal Weight	Primary Clinical Reference
Devine (1974)	56.9 kg	Default model for clinical medication clearances & dosing guidelines.
Robinson (1983)	57.4 kg	Modern refinement of Devine showing closer fit to observational health statistics.
Miller (1983)	59.8 kg	Adjusts the height multiplier curve, reducing variance for taller populations.
Hamwi (1964)	56.4 kg	Legacy dietary modeling formula still widely used by registered dietitians.

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Frequently Asked Questions

Why are there different formulas for Ideal Body Weight?▾

Different medical researchers developed equations over the decades to address specific limitations. The Devine formula was initially created in 1974 for pharmacokinetics to help calculate medication clearances. In 1983, Robinson and Miller introduced models with slightly adjusted multipliers to better fit population observations. Registered dietitians continue to use Hamwi (1964) as a dietary target baseline.

What height is required to use the IBW formulas?▾

The classic equations are calibrated for adults over 5 feet (60 inches or 152.4 cm). For individuals under 5 feet, the calculator applies negative scaling offsets or standard baseline corrections, though observational accuracy may vary for shorter stature.

Is ideal weight modeling accurate for athletes or bodybuilders?▾

No, standard IBW formulas and BMI classifications only account for height and gender. They do not differentiate between fat-free mass (muscle, bone, organs) and adipose tissue (fat). Muscular individuals will likely register as having high BMIs or exceeding their ideal weights despite excellent health and low body fat percentages.