Which ideal weight formula is most accurate?

No single formula is universally most accurate. Devine (1974) is the most commonly referenced, but Robinson and Miller offer more conservative estimates. The average of all four provides a balanced reference point.

Why do the formulas give different results?

Each formula was developed using different populations, time periods, and purposes (drug dosing, insurance tables, clinical estimation). The differences typically range from 2–5 kg between the highest and lowest estimates.

How does frame size affect ideal weight?

Frame size adjusts the average by ±10%. A small-framed person's ideal weight is estimated to be about 10% lower, while a large-framed person's is about 10% higher. This accounts for differences in bone structure and skeletal mass.

Should muscular people use this calculator?

These formulas do not account for muscle mass. Athletes and strength-trained individuals often exceed formula-based ideal weights while having healthy body composition. Consider using a body composition tool like the Lean Body Mass Calculator for better context.

Ideal Weight Calculator

Name: Ideal Weight Calculator
Author: Manish Kumar

Key Takeaways

Four validated formulas (Devine, Hamwi, Robinson, Miller) estimate "ideal" body weight based on height and sex — each was developed for different populations and purposes.^[1]
No single formula defines a universally "correct" weight — body composition, muscle mass, bone density, and personal goals all matter more than any single number.
The BMI-based range (18.5–24.9) provides additional context alongside the formula estimates.^[2]
Frame size adjustment (±10% for small/large frames) accounts for differences in skeletal structure.

The Four Formulas

Devine (1974)

Originally developed for drug dosage calculations. The most widely referenced ideal weight formula. Male: 50 + 2.3 × (height_in − 60) kg.^[1]

Hamwi (1964)

Developed for quick clinical estimation. Uses slightly different coefficients per inch above 5 feet. Male: 48 + 2.7 × (height_in − 60) kg.

Robinson (1983)

A refinement of earlier equations based on insurance height-weight tables. More conservative per-inch increment. Male: 52 + 1.9 × (height_in − 60) kg.^[3]

Miller (1983)

The most generous baseline weight among the four formulas. Smallest per-inch increment. Male: 56.2 + 1.41 × (height_in − 60) kg.

BMI Cross-Check

The healthy BMI range of 18.5–24.9 translates to a weight range for your height. This range is shown alongside formula results for additional context. For a dedicated analysis, use the BMI Calculator.

Neither formula-based ideal weight nor BMI accounts for body composition. An athletic individual with high muscle mass may exceed formula estimates while being in excellent physical condition. For body composition insight, try the Lean Body Mass Calculator.

Limitations

All four formulas were developed using Western population data and may not generalize to all ethnic backgrounds.
None of the formulas account for age, body fat percentage, or muscle mass.
Frame size adjustment is a rough approximation — wrist circumference or elbow breadth measurements are more precise.
These formulas were originally designed for clinical drug dosing or insurance tables, not as fitness targets.
This tool is for informational and journaling purposes only. It does not constitute personalized advice.

Frequently Asked Questions

Sources & References

Ideal body weight estimation. Pai MP, Paloucek FP. Pharmacotherapy (2000)
Body mass index and health. WHO. World Health Organization (2024)
Comparison of ideal body weight equations. Peterson CM, et al.. Nutr Clin Pract (2016)

Manish Kumar

Certified Personal Trainer & Sports Nutritionist

NASM-CPTCertified Sports Nutritionist10+ Years Experience500+ Clients Coached

NASM-certified fitness and nutrition coach with over 10 years of hands-on experience helping people build strength, lose fat, and live healthier lives. Specializing in gym-based workouts with a strong focus on lifting technique, biomechanics, and practical exercise science. Through FitLifeRegime, sharing the tools, tips, and insights that have worked for hundreds of clients — helping you start your own fitness journey with confidence and clarity.

Learn more about Manish

NASM Certified

Certified Personal Trainer & Sports Nutritionist from the National Academy of Sports Medicine

This tool is for informational and journaling purposes only.

I am NOT a doctor.