Ideal Weight Calculator
Estimate your ideal body weight with the Devine, Hamwi, Robinson, and Miller formulas.
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What is Ideal Weight Calculator?
Ideal Weight Calculator estimates your Ideal Body Weight (IBW) using four clinically established formulas: Devine (1974), Hamwi (1964), Robinson (1983), and Miller (1983). Each formula calculates a target weight from your height and sex, originally derived from population studies and widely used in nutrition planning and pharmacy dosing. The tool shows all four results side by side with an average and range, in both kilograms and pounds.
Key Benefits
- Compare four IBW formulas in one view
- Instant results in kg and lbs
- Metric and imperial unit support
- Separate male and female calculations
Common Use Cases
- •Setting a healthy weight goal
- •Nutrition and diet planning
- •Pharmacy dosing reference
- •Fitness progress tracking
How to Calculate Your Ideal Body Weight
- Choose your unit system: Select metric (cm) or imperial (ft/in) for entering your height.
- Enter your height: Type your height in centimeters, or in feet and inches.
- Select your sex: Pick male or female. Each formula uses a different base weight per sex.
- Compare the four formulas: Read the Devine, Hamwi, Robinson, and Miller results plus the average and range. Copy any value you need.
Key Features
- Four IBW formulas compared side by side (Devine, Hamwi, Robinson, Miller)
- Metric (cm) and imperial (ft/in) height input
- Separate male and female calculations
- Average and range summary across all formulas
- Copy any result to clipboard instantly
- Shows the exact formula and source year for each estimate
Frequently Asked Questions
Which ideal weight formula should I use?
There is no single best formula. Devine is the most widely cited and is commonly used for drug dosing. Robinson and Miller are more conservative. This tool shows all four side by side so you can compare; the average gives a balanced reference point.
Are these formulas accurate for athletes or very muscular people?
No. All four formulas estimate weight from height alone and assume an average body composition. They do not account for above-average muscle mass, age, bone frame size, or body-fat percentage. Treat the results as a general guide, not a target.
Why do male and female results differ?
Each formula uses a different base weight and per-inch increment for males versus females, reflecting average body-composition differences observed in the original population studies.
Does the calculator work offline?
Yes. All calculations run entirely in your browser. No data is sent to any server, and the tool works without an internet connection once the page has loaded.