Ideal Weight Calculator

- May 09, 2025

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Calculate your ideal weight based on different formulas using your height, gender, and body frame. This calculator includes multiple scientifically-based formulas for comparison.

Personal Information

Gender:

Age:

Body Frame:

Height

Metric (cm)

Imperial (ft & in)

Height (cm):

Formula Selection

BMI Method (BMI = 22)

Devine Formula

Robinson Formula

Miller Formula

Hamwi Formula

Display Options

Show all weight units (kg, lbs, stones)

Show formula explanations

Decimal Places:

Your Ideal Weight Results

Height

170 cm (5'7")

Formula Explanations

BMI Method

The BMI method uses a BMI of 22 (considered optimal) to calculate ideal weight:

Ideal Weight = 22 × (Height in metres)²

This method is based on the Body Mass Index (BMI) formula and uses 22 as the target BMI, which is in the middle of the "normal weight" range (18.5-24.9).

Devine Formula

Developed by Dr. B.J. Devine in 1974, this formula is commonly used in clinical settings:

Male: Ideal Weight (kg) = 50 + 2.3 × (Height in inches - 60)

Female: Ideal Weight (kg) = 45.5 + 2.3 × (Height in inches - 60)

This formula accounts for gender differences and is valid for adults with height over 5 feet (60 inches).

Robinson Formula

Developed by J.D. Robinson in 1983, this formula is a modification of the Devine formula:

Male: Ideal Weight (kg) = 52 + 1.9 × (Height in inches - 60)

Female: Ideal Weight (kg) = 49 + 1.7 × (Height in inches - 60)

Robinson's formula typically gives slightly lower weights than Devine's formula.

Miller Formula

Created by Dr. D.R. Miller in 1983, this formula gives the lowest estimates:

Male: Ideal Weight (kg) = 56.2 + 1.41 × (Height in inches - 60)

Female: Ideal Weight (kg) = 53.1 + 1.36 × (Height in inches - 60)

Miller's formula is often used when a more conservative ideal weight estimate is preferred.

Hamwi Formula

Introduced by Dr. G.J. Hamwi in 1964, this is one of the earliest formulas:

Male: Ideal Weight (kg) = 48.0 + 2.7 × (Height in inches - 60)

Female: Ideal Weight (kg) = 45.5 + 2.2 × (Height in inches - 60)

Hamwi's formula typically gives the highest weight estimates and includes adjustments for frame size:
Small Frame: Subtract 10%
Large Frame: Add 10%

Important Notes

Ideal weight formulas provide estimates, not absolute targets.
These formulas don't account for muscle mass, body composition, or individual health factors.
Healthy weight ranges can vary significantly between individuals.
Consult with healthcare professionals for personalised weight recommendations.

About Ideal Weight

The concept of "ideal weight" refers to a weight range that is associated with optimal health outcomes based on a person's height, gender, age, and body frame. Various formulas have been developed to estimate this range.

Factors Affecting Ideal Weight

Height: Taller individuals generally have higher ideal weights.
Gender: Males typically have higher ideal weights due to greater muscle mass and bone density.
Body Frame: People with larger skeletal frames may have higher ideal weights.
Age: Optimal weight can change with age due to changes in muscle mass and metabolism.
Muscle Mass: Individuals with higher muscle mass may be healthy at weights above formula estimates.

Limitations of Ideal Weight Formulas

Most formulas were developed in the mid-20th century and may not reflect current health research.
They don't account for differences in body composition, ethnicity, or individual metabolic factors.
Athletic individuals with high muscle mass may be classified as "overweight" despite being healthy.
Weight alone is not a comprehensive indicator of health - other factors like blood pressure, cholesterol levels, and overall fitness are important.

Understanding the Ideal Weight Calculator

The Ideal Weight Calculator helps you determine what your healthy weight range should be. It uses your height, gender, and body frame size to provide estimates based on scientific formulas. This tool offers a straightforward way to understand your ideal weight alongside different methods of calculation. By comparing various formulas, you can find one that fits your personal Health goals.

How to Use the Calculator

Using the Ideal Weight Calculator is simple and user-friendly. You just need to enter a few details like your gender, age, height, and body frame size. The calculator will then display your ideal weight based on the formulas selected. Each formula gives a slightly different range, which can help you see how different factors might affect your weight.

Key Factors to Consider

Height: Taller individuals usually have higher ideal weights.
Body Frame: A person’s skeletal structure can influence their ideal weight.
Gender: Males often weigh more than females due to different muscle and bone structures.
Age: As you age, your ideal weight range can change.

Choosing Your Measurement System

The calculator allows you to choose between metric (centimetres) and imperial (feet and inches) measurements for height. This flexibility makes it accessible to users from different regions. Whether you’re more comfortable with one system or the Other, you can easily input your height and continue with the calculations.

Understanding the Different Formulas

Several formulas are available in the Ideal Weight Calculator, each offering a unique approach to calculating ideal weight. These include the BMI method, Devine Formula, Robinson Formula, Miller Formula, and Hamwi Formula. Each formula has its own considerations and may suit different individuals based on their body composition and health objectives.

Why Display Options Matter

The display options in the calculator allow you to customise how results are shown. You can choose to see all weight units like kilograms, pounds, and stones or opt for detailed explanations of the formulas used. These features provide clarity and help you understand your results better, making the experience more tailored to your preferences.

Interpreting Your Results

Your results will include your ideal weight range based on your specifications.
Each formula's calculation will be shown, allowing you to compare them.
Explanations of the formulas will help you understand how they apply to your situation.
Notes will be included to remind you that these weights are estimates and not strict targets.

Consulting a Professional

While the Ideal Weight Calculator gives you useful estimates, it’s essential to remember that these are not definitive. Individual health varies greatly, and factors like muscle mass and lifestyle play significant roles. For more tailored advice, consulting with a healthcare professional is recommended. They can provide personalised guidance based on your unique health profile.

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