Health & Fitness Calculators
Ideal Weight Calculator
Compare historical adult reference-weight equations with separate results and clear limitations.
Why these are reference-weight estimates
Devine, Robinson, Miller, and Hamwi are historical height-based equations developed for reference uses. Their continued familiarity does not make any result a direct measure of body composition, health, or an appropriate personal target.
Formulas and worked example
Each equation starts with a five-foot base and adds its own kilograms-per-inch constant. For a 70-inch male equation set, Devine gives 50 + 2.3 x 10 = 73 kg; Robinson gives 71 kg; Miller gives 70.3 kg; and Hamwi gives 75 kg. No average or BMI-derived range is calculated.
Why the equations differ
Their base values, increments, historical samples, and intended uses differ. The calculator accepts adult-context heights from five to seven feet and does not extrapolate below the five-foot reference point.
Limitations and common mistakes
These formulas do not account for body composition, frame, age-related changes, pregnancy, medication, or clinical context. They do not diagnose health, nutritional status, or eating disorders. Do not average the outputs, treat their spread as a recommended range, or use them as medication-dosing guidance. For different measurement contexts, see the BMI Calculator and Body Fat Calculator.
Transparency note
Accuracy and limitations
Calzivo tools are built for practical estimates, conversions, and checks. Some tools use standard formulas or simplified assumptions, and results can be affected by input accuracy, rounding, units, local rules, or changing official requirements.
Health and fitness results are estimates, not medical advice. Formulas simplify real bodies and cycles, so important health decisions should be checked with a qualified clinician.
How to Use This Tool
Use these steps to enter the right inputs and interpret the result correctly.
Select US or metric height units and the historical male or female equation set.
Enter a height that normalizes to 60 through 84 inches.
Calculate to compare the four historical equations separately.
Related Tools
Other helpful tools in the Health & Fitness Calculators category.
BMI Calculator
Calculate adult BMI from height and weight with cautious screening-category context.
Body Fat Calculator
Estimate body fat percentage from defined circumference measurements with a historical equation.
Lean Body Mass
Calculate estimated lean body mass and fat mass from weight and entered body fat.
Related Guides
Background reading and explanations related to Ideal Weight Calculator.
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BMI Limits: What BMI Can and Cannot Tell You
Understand BMI as a screening estimate and where body composition context matters.
BMI Explained (What It Means and When It Misleads You)
What your BMI score really means.
Frequently Asked Questions
Common questions about Ideal Weight Calculator and how to read the result.
Do these equations identify an appropriate weight?
No. They are historical height-based reference equations and do not establish a healthy, recommended, or target weight for an individual.
Why are there four separate results?
The equations use different base values and per-inch additions. Keeping them separate makes those assumptions visible without averaging them.
Why is the minimum height five feet?
These equations add weight for inches above five feet. This calculator does not extrapolate them below that reference height.
Are the equation-set labels statements about gender identity?
No. Male and female equation set identify the constants used in the historical formulas, not an assessment of identity or individual suitability.