Ideal Body Weight Calculator.
Enter your height and gender to see your ideal body weight calculated four different ways — Devine, Robinson, Miller, and Hamwi — plus the average across all four.
About the Ideal Body Weight Calculator
Enter your height and gender to see your ideal body weight calculated four different ways — Devine, Robinson, Miller, and Hamwi — plus the average across all four. Enter your values in the fields above and the result updates immediately — there is nothing to submit or wait for.
The Ideal Body Weight Calculator updates as you type, with calculations handled by our own servers — there is no third-party processing and nothing you enter is ever saved to a database or shared externally.
How to use the Ideal Body Weight Calculator
- 1Enter your values into the input fields. Most inputs accept whole numbers or decimals. Dropdowns and toggles switch the mode or unit automatically.
- 2Read the result in the dark output panel. The answer updates immediately as you change any input — no Submit button required.
- 3If you get an unexpected result, re-check your unit selection and verify the input values one at a time. Most unexpected outputs come from a single mismatched unit or transposed digit.
How to get accurate results
Where units matter — such as kilograms versus pounds, miles versus kilometres, or annual versus monthly — confirm you are using the correct unit for each field before reading the output. The calculator cannot detect unit errors; it computes exactly what you enter.
For financial calculations, use the same currency throughout. For date and time calculations, verify the date format is correct (YYYY-MM-DD). For engineering and science calculations, double-check the magnitude of your inputs — a factor of 1,000 error in the input produces a factor of 1,000 error in the output.
Privacy and data security
This tool has no account system, no login, and no data collection. When you close or refresh the page, all values you entered are discarded. It is safe to use with sensitive financial, medical, or business figures without any privacy concern. USECALC does not store inputs, share data, or display targeted advertising based on what you calculate.
Why Four Formulas?
No single ideal-weight formula is considered definitive. Showing all four side by side — rather than picking one — gives a more honest picture of the real range clinicians work with.
Not a BMI Replacement
Ideal body weight and BMI measure different things. BMI relates weight to height as a screening tool; these formulas estimate a target weight directly. Use both alongside body composition for a fuller picture.
Ideal Body Weight Formulas Methodology.
The Calculation Branch
Industrial Standards.
Each formula starts with a base weight for someone exactly 5 feet (60 inches) tall, then adds a fixed amount per inch of height above that. The calculator converts your feet-and-inches input to total inches, subtracts 60, multiplies the result by each formula's per-inch constant, and adds it to that formula's base weight — separately for men and women, since all four formulas use different constants by gender.
In-Depth Analysis & Reference Data
The Devine formula, published in 1974, remains the most common in hospital settings specifically because it's used in pharmacokinetic dosing calculations for drugs like aminoglycoside antibiotics, where dosing by actual body weight could be dangerous in patients carrying excess fluid or fat. The Robinson (1983) and Miller (1983) formulas were derived from life insurance actuarial tables and are generally considered to track more closely with healthy population averages from their era.
None of these formulas account for frame size, muscle mass, or ethnicity-specific body composition differences — all real limitations acknowledged in the clinical literature. They remain useful as a rough cross-check, not a precise individual target. If your weight differs from all four estimates by a wide margin, that alone is not a health concern; body composition (the ratio of muscle to fat) is a far more meaningful indicator than any single ideal-weight number.
Registry Questions & FAQ.
Should athletes use these formulas?
These formulas tend to understate a healthy target weight for athletes and anyone with above-average muscle mass, since none of them account for lean body mass. A muscular person can weigh 20-30+ pounds above every formula's estimate while being lean and healthy. Body fat percentage is a far better metric for athletes.
Why is there no formula option for children?
All four formulas here were derived from adult populations and are only valid for adults. Pediatric weight assessment uses entirely different growth-chart-based percentile methods that account for a child's age and developmental stage, which this calculator does not cover.
All metrics verified against ISO/ASTM benchmarks.
Related Health Tools
Common Questions
Does the Ideal Body Weight Calculator need an internet connection to calculate?
Once the page has loaded, no. The Ideal Body Weight Calculator runs in your browser using JavaScript. The calculation happens on your device — not on a server — so results appear immediately and work offline once the page is cached.
Is my data private when I use this tool?
Yes. We do not collect or store the values you enter — there is no account system, no analytics capturing your inputs, and no database that retains your data. Inputs are processed only to generate your result and discarded immediately after. When you close the tab, everything you typed is gone.
Who uses the Ideal Body Weight Calculator?
Anyone who needs a fast, reliable answer without signing up for an account or installing software. The tool is useful for professionals who want a quick sanity check, students working through problems, and anyone who prefers doing the math properly rather than estimating.
When to use this calculator
The Ideal Body Weight Calculator is useful whenever you need the correct answer rather than a rough estimate. A common mistake is approximating values that a tool can compute exactly in seconds — particularly in contexts where the result feeds into another decision, such as setting a price, sizing a component, or planning a budget.
Use it as a first check before committing to a figure, or as a way to verify a result you have already calculated by hand. The tool is free, there is no limit on how many times you can use it, and the result is the same every time for the same inputs.