Ideal Weight Calculator

The Ideal Weight Calculator calculates the optimal body weight (OBW) considering factors like height, gender, and age. Determining the OBW through a specific formula has intrigued numerous professionals over the years. Presently, multiple renowned formulas exist, and our calculator offers a comparative view of their outcomes.

Age ages 2 - 80
feet   inches
Height cm


The ideal weight based on popular formulas:

Formula Ideal Weight
Robinson (1983) 72.6 kgs
Miller (1983) 71.5 kgs
Devine (1974) 75.0 kgs
Hamwi (1964) 77.3 kgs
Healthy BMI Range 60.1 - 81.3 kgs

The Perception of Ideal Weight

Almost everyone has either attempted weight loss or knows someone who has. This drive largely stems from society's perception of an "ideal" body weight, shaped by various media like social media, TV, movies, and magazines.

Origins of IBW

Contrary to popular belief, the concept of IBW wasn't introduced for aesthetic appeal. It was created to estimate medical dosages. Interestingly, the formulas aren't linked to visual appearance at specific weights. It was later discovered that some drugs' metabolism aligns more with IBW than total body weight. Now, IBW is also prevalent in sports, classifying individuals based on weight.

Limitations of IBW

IBW isn't foolproof. It doesn't account for body fat and muscle percentages. As a result, exceptionally fit athletes might be labeled overweight according to IBW. It's crucial to understand that IBW is a rough guide and not always indicative of health or a target weight.

The Fluid Nature of Ideal Weight

Deciphering an individual's ideal weight isn't straightforward. No metric, whether IBW, BMI, or another, can decisively pinpoint a person's optimal weight for health. These tools are mere references. Prioritizing healthy habits like regular exercise, balanced diets, and adequate sleep often surpasses the importance of adhering to a generalized weight formula.

Factors Influencing Ideal Weight

While numerous elements can dictate the ideal weight, some primary factors stand out. Other considerations include health status, fat distribution, genetics, and more.

Age and IBW

Though one might assume otherwise, age doesn't drastically influence IBW, especially after the ages of 14-15 for girls and 16-17 for boys — the general periods when most individuals cease to grow. Notably, by age 70, men and women are expected to lose 1.5 and 2 inches in height, respectively. As we age, we tend to lose lean muscle and gain body fat. Although aging's effects are inevitable, adopting habits like maintaining a balanced diet, exercising, and managing stress can mitigate them.

Gender Differences

On average, women tend to weigh less than men, despite having a naturally higher body fat percentage. This difference is attributed to the generally higher muscle content in males, and muscle weighs more than fat. Additionally, women typically have a lower bone density and are often shorter than men.

Height's Impact

An intuitive observation: as height increases, so does the weight due to an increase in muscle mass and body fat. For instance, a man and a woman of the same height would have a weight difference, with the man weighing roughly 10-20% more.

Role of Body Frame Size

Body frame size, categorized as small, medium, or large boned, significantly affects ideal weight measurements. Here's how you can determine it:

For Women:

  • Height under 5'2"

    • Small boned: wrist size less than 5.5"
    • Medium boned: wrist size 5.5" to 5.75"
    • Large boned: wrist size over 5.75"
  • Height between 5'2" and 5' 5"

    • Small boned: wrist size less than 6"
    • Medium boned: wrist size 6" to 6.25"
    • Large boned: wrist size over 6.25"
  • Height over 5' 5"

    • Small boned: wrist size less than 6.25"
    • Medium boned: wrist size 6.25" to 6.5"
    • Large boned: wrist size over 6.5"

For Men:

  • Height over 5' 5"
    • Small boned: wrist size 5.5" to 6.5"
    • Medium boned: wrist size 6.5" to 7.5"
    • Large boned: wrist size over 7.5"

A larger-boned individual will naturally weigh more than a smaller-boned person of the same height. This emphasizes the influence of body frame size on measurements like IBW and BMI.

Calculating Your Ideal Body Weight: Dive into the Formulas

Introduction to IBW Formulas

Ideal Body Weight (IBW) formulas originated primarily as tools to guide drug dosage calculations. These formulas typically base the weight on a 5-foot height and add a specified weight increment for each additional inch over 5 feet. For instance, using the Devine formula, a 5'10" male would compute his ideal weight as 50 kg plus (2.3 kg multiplied by 10 inches), resulting in 73 kg or approximately 161 lbs.

Interestingly, while different formulas were created based on various scientific research and findings, the Devine formula is the one predominantly adopted today.

A Closer Look at the IBW Formulas

G. J. Hamwi Formula (1964)

  • Male: 48.0 kg + 2.7 kg per inch over 5 feet
  • Female: 45.5 kg + 2.2 kg per inch over 5 feet Primary Use: Medicinal dosages

B. J. Devine Formula (1974)

  • Male: 50.0 kg + 2.3 kg per inch over 5 feet
  • Female: 45.5 kg + 2.3 kg per inch over 5 feet Note: Developed on the lines of Hamwi's formula, this became a universal metric for IBW.

J. D. Robinson Formula (1983)

  • Male: 52 kg + 1.9 kg per inch over 5 feet
  • Female: 49 kg + 1.7 kg per inch over 5 feet A Refined Version: This is an adaptation of the Devine Formula.

D. R. Miller Formula (1983)

  • Male: 56.2 kg + 1.41 kg per inch over 5 feet
  • Female: 53.1 kg + 1.36 kg per inch over 5 feet Another Take: Yet another adaptation of the Devine Formula.

Understanding BMI & Its Significance

The World Health Organization (WHO) suggests a healthy Body Mass Index (BMI) range of 18.5 to 25 for both men and women. Using this range, one can deduce a healthy weight for any given height.

Though BMI is a prevalent metric to calculate IBW, it's often leveraged by healthcare professionals as a preliminary indicator of potential health risks. A higher BMI often flags concerns of conditions like obesity, diabetes, and cardiovascular diseases. It's an essential measure for doctors to counsel patients about potential health risks, especially if there's a concerning and consistent rise in BMI.

Healthy BMI for Kids: A Special Mention

The aforementioned formulas are designed for adults aged 18 and above. For the young ones, the Centers for Disease Control and Prevention (CDC) have provided specific BMI charts. The CDC proposes that kids maintain their BMI between the 5th and 85th percentile relative to their age group.

Remember, everyone's body is unique. While these formulas provide guidance, they don't capture the complete picture. Always consult with a healthcare professional for a comprehensive health assessment.

Understanding the Limitations of the IBW Calculator

Broad-Based Formulas

All the methodologies and formulas come with inherent constraints. Crafted to cater to a vast populace, they might not pinpoint accuracy for every individual. The fundamental nature of these formulas makes them a broad-brush approach.

Factors Not Accounted For

Our IBW calculator primarily uses height and gender as its determining elements. However, it doesn't account for:

  • Physical disabilities or special conditions
  • Individuals at the extreme low or high ends of a spectrum
  • Variation in activity levels among individuals
  • The proportion of muscle to fat, also known as body composition

General Guideline, Not Absolute Metric

It's imperative to view our Ideal Weight Calculator as a tool providing general benchmarks based on renowned formulas. The results shouldn't be perceived as rigid targets or the definitive "ideal weight" for an individual. It's always beneficial to consult with healthcare professionals for personalized advice.

How to Calculate Ideal Body Weight?

Determine base weight for a 5-foot height. Add a set weight for every inch over 5 feet. Adjust based on gender and formula preference.

How to Calculate Ideal Weight?

Use a base weight for a 5-foot height. Add weight for every extra inch over 5 feet. Adjust for gender using specific formulas.