Body composition
Ideal Weight Calculator
Compare Devine, Robinson, Miller, and Hamwi formulas as a realistic range.
Result
Reference weight zone
The average of the four formulas inside their range.
Formula from Pai & Paloucek, origin of IBW equations (2000) and Devine (1974), checked against the source on May 25, 2026.
What does the Ideal Weight Calculator calculate, and which formula does it use?
The Ideal Weight Calculator compares four classic height-based formulas — Devine, Robinson, Miller, and Hamwi — each of which starts from a base weight for a five-foot frame and adds a fixed amount per inch above that. For a man, Devine is 50 kg + 2.3 kg per inch over five feet. The tool shows all four results as a practical range rather than one number.
Last updated .
How to use it
- Enter height and sex. The output shows a range from multiple formula references (Hamwi, Devine, Robinson, Miller) — this range, not a single number, is the intended output.
- These formulas were developed for medication dosing and anesthesia — they assume average body composition and consistently underestimate appropriate weight for people with above-average muscle mass.
- A person who resistance trains regularly will function optimally 10–20 lbs above what these formulas suggest. Frame the output as an orientation, not a personal target.
- If your weight significantly exceeds the range and you want to reduce, use the Body Fat Percentage Calculator and Calorie Deficit Calculator for actionable, composition-based targets instead.
- The most clinically useful individual target for most people is a BMI of 21–24 adjusted for build and body composition — more meaningful than any formula output.
Questions people usually ask
Which formula is used here?
Shows Devine, Robinson, Miller, and Hamwi formula estimates as a range rather than a single rigid target.
Can I use metric or imperial units?
Yes. This tool supports both metric and imperial units and remembers your preference.
Is this medical advice?
No. This tool provides general fitness estimates and should not replace medical guidance.
Is this tool free and private to use?
Yes. AI Fit Hub tools are free, no-signup browser tools. Inputs stay in your browser unless you choose to share a URL.
Do these tools replace medical guidance?
No. These outputs are general fitness estimates — not medical advice.
Can I switch between metric and imperial units?
Yes. Every tool supports both systems and remembers your preference in localStorage.
The formula, worked through
- Formula Ideal Weight Formula (Devine 1974)
Ideal weight formula from the Devine 1974 equation: men 50 + 2.3 kg per inch over 60, women 45.5 + 2.3, plus Robinson, Miller and Hamwi variants.
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- Nutrition TDEE Calculator
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- Nutrition Macro Calculator
Convert calorie targets into protein, carbs, and fat grams for your goal.
- Planning Calorie Deficit Calculator
Estimate required daily calorie deficit for a target timeline and bodyweight change.
Background on the Ideal Weight Calculator
- Guide How to Calculate Your Ideal Weight
How to calculate your ideal weight using BMI, the Devine formula, body fat percentage, and waist-to-height ratio, plus why a healthy range beats one number.
- Examples Ideal Weight Examples
Discover diverse ideal weight examples for athletes, sedentary individuals, and more. Learn how factors like body composition, age, and lifestyle redefine.
- Checklist Weight Loss Checklist
Plan sustainable weight loss with this practical checklist from AI Fit Hub. Set realistic goals, optimize nutrition, and structure activity for lasting results.
Articles
- 11 min read TDEE Formulas Compared: Mifflin vs Harris vs Katch
TDEE formulas compared: Mifflin-St Jeor, Harris-Benedict, Katch-McArdle, WHO/FAO. Population, error bands, and when each estimator is appropriate.
- 7 min read Ideal Weight vs BMI vs FFMI for a 178cm Male: Three Failure Modes
Ideal weight, BMI, and FFMI engines give three target weights for the same 178cm male. Where Devine breaks, where BMI breaks, where FFMI replaces both.
- 8 min read How to Break a Weight-Loss Plateau
Breaking a weight-loss plateau: adaptive thermogenesis math, refeed protocols, training-volume changes, and the four leverage points before changing tools.
By goal
Use it from code
The same calculation as a JavaScript module you can import. It runs where you import it, with no request, key or rate limit.
import { compute } from "https://aifithub.io/engines/ideal-weight-calculator.js";Input and output contract, TypeScript types and the guide for agents.