Ideal Weight Calculator
The ideal weight calculator estimates a healthy target weight for your height and gender using four widely cited medical formulas — Devine, Robinson, Miller, and Hamwi. Instead of returning a single number, it shows all four results side by side plus a recommended range, so you get a realistic target zone rather than one rigid figure.
It is built for anyone curious about a healthy weight for their height: people setting a weight goal, comparing their current weight to a reference range, or simply wondering how the classic clinical formulas differ. Enter your height, pick a gender, and every formula recalculates instantly.
How to Use the Ideal Weight Calculator
Choose your unit system
Toggle between Metric (cm and kg) and Imperial (feet, inches, and lbs). You can switch at any time and every input and result updates automatically.
Select your gender
Pick Male or Female. Each formula applies different gender-specific coefficients, so this choice changes every result.
Enter your height
Type your height in centimeters, or in feet and inches in Imperial mode. Tap a Quick height preset to fill a common value instantly.
Read your results
See the Recommended Range (min to max across all four formulas), the Average, and each individual Devine, Robinson, Miller, and Hamwi result — all calculated as you type.
Compare your current weight
Optionally enter your current weight to see a visual bar showing where you fall relative to the ideal range, along with a personalized suggestion.
Features
Four Medical Formulas
Devine, Robinson, Miller, and Hamwi are calculated simultaneously for complete coverage instead of one isolated number.
Recommended Range
The min-to-max spread across all four formulas is shown prominently, with an average value as a single reference point.
Current Weight Comparison
Enter your weight to get a visual bar and a suggestion showing how far above or below the ideal range you are.
Metric and Imperial
Switch between cm/kg and ft-in/lbs instantly; all inputs and results convert on the fly.
Male and Female Formulas
Each formula applies gender-specific coefficients, so results reflect the right reference for you.
Quick Height Presets
Tap a common height button to fill the input instantly, in either unit system.
Instant Results
All four formulas update live as you type — there is no calculate button to press.
Formula Reference Table
A built-in table shows every formula's equation so you can see exactly how each result is derived.
Dark Mode Support
The interface adapts automatically to your device's light or dark theme preference.
Frequently Asked Questions
How is ideal body weight calculated?
Each formula starts from a base weight and adds an amount for every inch of height above 5 feet (60 inches). This calculator runs four of them — Devine, Robinson, Miller, and Hamwi — and reports each result, their average, and the overall min-to-max range. Aiming to fall within that range is generally more useful than chasing one exact figure.
What is the Devine formula?
The Devine formula (1974) was originally developed to calculate drug dosing in clinical pharmacology and is the most widely cited ideal-weight formula in medical settings. For men it is 50 + 2.3 kg per inch above 60 inches; for women it is 45.5 + 2.3 kg per inch. You can see all four equations in the reference table inside the tool.
Why do the formulas give different results?
Each formula was derived from a different population study and intended for a different clinical purpose, so the coefficient per inch of height varies slightly between them. These small differences add up, especially for taller people, which is why showing all four together is more informative than relying on a single formula.
Ideal weight vs BMI — what is the difference?
Ideal body weight formulas give a single target weight derived from height and gender, while a healthy weight is usually expressed as a range based on BMI (18.5–24.9). The two are related but calculated differently. Neither accounts for body composition, so a very muscular person can read "above ideal" while still being in excellent health.
Does ideal weight differ for men and women?
Yes. Every formula uses a lower base weight for women than for men, and some also use a different coefficient per inch of height. That is why selecting Male or Female changes the recommended range and all four formula results.
Do these formulas work for children or short statures?
No. These formulas were developed for adults and are based on height above 5 feet (60 inches). For children and teenagers, use age-specific growth charts from health authorities such as the WHO or CDC. For heights well below the 5-foot threshold the results become unreliable, so consult a healthcare provider for a personalized assessment.
Should I use this as a medical target?
No. This is an educational tool based on established formulas. It does not account for individual factors such as muscle mass, bone density, age, ethnicity, or underlying health conditions. Always consult a qualified healthcare provider before making decisions about your weight or diet.
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