Ideal Weight Calculator
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Ideal Weight Calculator
An Ideal Weight Calculator is a free online tool that provides a reference estimate of body weight based on height and gender. Instead of treating one number as the universally “perfect” weight, the calculator compares several commonly cited ideal body weight formulas to provide a useful reference.
Calculator Pool’s free Ideal Weight Calculator online uses four traditional formulas:
- Devine Formula
- Robinson Formula
- Miller Formula
- Hamwi Formula
It then provides a simple average of the four estimates.
Because these formulas were developed using different datasets and assumptions, they can produce different results for the same height. Research has documented this variability and emphasizes that these equations are estimates rather than a universal definition of healthy weight.
Important: An ideal body weight formula is not a medical diagnosis and does not determine an individual’s healthiest weight. Actual healthy weight can vary according to body composition, age, health status, lifestyle, and other factors.
What Is Ideal Weight?
The term ideal weight is commonly used to describe a reference body weight associated with a person’s height.
However, there is no single weight that is automatically ideal for every person of the same height.
Different ideal body weight formulas have been developed over time. These include the Devine, Robinson, Miller, and Hamwi equations.
For this reason, an ideal weight calculator is better understood as a reference tool rather than a precise measurement of what someone should weigh.
What Is an Ideal Weight Calculator?
An ideal weight calculator estimates a reference body weight using your:
Gender
and:
Height
Calculator Pool’s tool applies several established reference equations and displays the results individually.
It provides:
- Devine estimate
- Robinson estimate
- Miller estimate
- Hamwi estimate
- Reference average
This allows you to see how different formulas compare instead of relying on only one equation.
How to Use the Ideal Weight Calculator
Using Calculator Pool’s online ideal weight calculator is simple.
Step 1: Select Gender
Choose:
Male
or:
Female
Step 2: Enter Height
Enter your height in centimetres.
For example:
175 cm
Step 3: Calculate
Click:
Calculate Ideal Weight
The calculator will display the reference estimates from four formulas.
You will see:
Devine
Robinson
Miller
Hamwi
along with a simple average.
Ideal Weight Calculator Formula
Calculator Pool’s calculator uses four commonly cited ideal body weight formulas.
These equations generally express reference weight as a function of height, often using height above 5 feet as the basis.
Devine Ideal Weight Formula
The Devine formula is one of the most commonly cited ideal body weight equations.
For men:
IBW = 50 + 2.3 × (inches over 5 feet)
For women:
IBW = 45.5 + 2.3 × (inches over 5 feet)
These values correspond to the traditional Devine equations summarized in published reviews.
Example
For a man whose height is approximately:
175 cm
the height in inches is approximately:
68.9 inches
The amount above 60 inches is approximately:
8.9 inches
Therefore the Devine estimate is approximately:
50 + (2.3 × 8.9)
≈ 70.5 kg
This is a mathematical reference estimate, not a recommended target weight.
Robinson Ideal Weight Formula
The Robinson formula was developed as another height-based ideal body weight equation.
For men:
IBW = 52 + 1.9 × (inches over 5 feet)
For women:
IBW = 49 + 1.7 × (inches over 5 feet)
These equations are among the commonly cited Robinson reference formulas.
For the same height, Robinson can produce a different estimate from Devine because the equations use different constants and coefficients.
Miller Ideal Weight Formula
The Miller formula is another commonly cited reference equation.
Calculator Pool uses:
For men:
IBW = 56.2 + 1.41 × (inches over 5 feet)
For women:
IBW = 53.1 + 1.36 × (inches over 5 feet)
Published literature lists these Miller equations among established ideal body weight formulas.
Hamwi Ideal Weight Formula
The Hamwi formula is another traditional ideal body weight equation.
For men, the traditional equation is expressed as:
106 lb + 6 lb for each inch over 5 feet
For women:
100 lb + 5 lb for each inch over 5 feet
The Hamwi equation is one of several traditional formulas developed for estimating reference body weight.
Calculator Pool presents its result in kilograms for easier comparison with the other formulas.
Why Does the Calculator Use Multiple Formulas?
Different ideal body weight formulas can produce different results.
For example, Devine, Robinson, Miller, and Hamwi were developed at different times and using different assumptions or source data. Research comparing these equations has found meaningful variation in the resulting estimated weights.
Showing multiple formulas gives users more context than presenting one number as universally correct.
What Is the Reference Average?
Calculator Pool calculates a simple average of the four formula results:
Reference Average = (Devine + Robinson + Miller + Hamwi) ÷ 4
This is simply a mathematical average of the displayed formula estimates.
It does not represent a medically established “ideal weight.”
The purpose is to provide a convenient summary when the individual formula estimates differ.
Ideal Weight Example
Suppose:
Gender: Male
Height: 175 cm
Calculator Pool may produce reference values from each of the four formulas.
The estimates can vary because the equations use different coefficients.
For example, using the formulas implemented in the calculator:
| Formula | Approximate Reference Weight |
|---|---|
| Devine | 70.5 kg |
| Robinson | 68.9 kg |
| Miller | 68.8 kg |
| Hamwi | 72.3 kg |
| Reference Average | 70.1 kg |
These figures illustrate why different ideal weight calculators may provide different answers for the same height.
Ideal Weight for Men
An ideal weight calculator for men generally requires height and applies a male-specific formula.
Calculator Pool uses:
Devine
Robinson
Miller
Hamwi
The resulting estimates should be considered reference values rather than a precise indication of healthy body weight.
Ideal Weight for Women
An ideal weight calculator for women similarly uses height and female-specific versions of the reference equations.
The four formulas can produce different estimates because their coefficients differ.
This means two calculators using different formulas can give different results while both performing their calculations correctly.
Ideal Weight Based on Height
Height is the primary input for the Calculator Pool ideal weight calculator.
For example, a person who is:
160 cm
will generally receive a different reference estimate from someone who is:
180 cm
The formulas use height to estimate a reference weight.
However, height alone cannot describe body composition or overall health.
Ideal Weight for 5 Feet Height
Five feet is approximately:
152.4 cm
The traditional formulas use 5 feet as a reference height and then adjust the estimated weight for additional inches.
For someone exactly 5 feet tall, the “inches over 5 feet” portion becomes zero.
The base value therefore determines the formula’s estimate.
Ideal Weight for 5’5″
A height of:
5 feet 5 inches
corresponds to:
65 inches
The height above the 5-foot baseline is:
5 inches
This additional height is then multiplied by the gender-specific coefficient in each formula.
Because the coefficients differ, Devine, Robinson, Miller, and Hamwi produce different reference values.
Ideal Weight for 5’10”
A height of:
5 feet 10 inches
is:
70 inches
That is:
10 inches above the 5-foot reference
Each formula applies its own coefficient to those additional inches.
This illustrates how the equations scale reference body weight with increasing height.
Ideal Weight for 6 Feet
A height of:
6 feet
is:
72 inches
Therefore:
12 inches over 5 feet
The formulas then apply their respective male or female coefficients.
Again, the resulting estimates are reference calculations rather than personalized health targets.
Ideal Weight and BMI
BMI (Body Mass Index) and ideal body weight are different concepts.
BMI is calculated from:
Weight and Height
An ideal body weight equation, on the other hand, provides a reference weight primarily from:
Height and Gender
BMI can be useful as one population-level screening measure, but it has limitations and does not directly measure body composition.
Therefore, an ideal weight calculator should not be interpreted as an alternative medical assessment of overall health.
Calculator Pool also offers a dedicated BMI Calculator for users who want to calculate BMI.
Ideal Weight vs Healthy Weight
These terms should not automatically be treated as identical.
An ideal weight formula produces a mathematical reference value.
A healthy weight is a broader concept that can depend on:
- Body composition
- Age
- Sex
- Health status
- Lifestyle
- Physical activity
- Individual circumstances
Published discussions of ideal body weight equations also note that different formulas can produce different values and are not consistent across all heights.
Ideal Weight vs Actual Weight
Your actual body weight is the amount shown on a scale.
An ideal-weight equation provides an estimate based primarily on height and gender.
For example, two people who are both:
175 cm tall
could have very different body weights because of differences in muscle mass, body composition, age, and other characteristics.
Therefore, the estimated reference weight should not automatically be treated as a personal target.
Ideal Weight and Body Composition
Body composition describes what your body weight is made of, including muscle, fat, bone, and other tissues.
Two people can have the same weight but significantly different body compositions.
Traditional ideal body weight equations generally do not directly measure these differences.
This is an important limitation of a simple ideal body weight calculator.
Can Ideal Weight Be One Exact Number?
Not necessarily.
The four formulas used by Calculator Pool can generate different values for the same person.
Research examining ideal body weight equations has found considerable variation between formulas.
Therefore, it is better to think of the results as:
Reference Estimates
rather than:
One Exact Ideal Weight
Why Different Ideal Weight Calculators Give Different Results
Different websites may use different formulas.
One calculator may use:
Devine
while another might use:
Robinson
or:
Miller
or another method.
Since the formulas have different coefficients, their results can differ.
This does not necessarily mean one calculator is malfunctioning; it may simply be using a different equation.
Which Ideal Weight Formula Is Best?
There is no single formula that should automatically be considered the universally best choice for every purpose.
Different formulas were developed for different contexts, and research has shown variation between them.
Calculator Pool therefore displays several formulas rather than claiming that one value represents everyone’s ideal weight.
For medical or clinical applications, the appropriate method depends on the specific purpose and professional context.
Ideal Weight Calculator for Fitness
A fitness enthusiast may use an ideal weight calculator as a rough reference when setting personal goals.
However, body composition can be more informative than scale weight alone when evaluating fitness progress.
For example, resistance training can increase muscle mass without producing the same change in total body weight.
Therefore, weight should be considered alongside other measures and goals.
Ideal Weight Calculator for Weight Loss
An ideal weight calculator for weight loss can provide a reference value, but the number should not automatically become a target.
Weight management depends on many factors, including:
- Nutrition
- Physical activity
- Sleep
- Body composition
- Health
- Individual goals
A simple height-based formula cannot account for all of these factors.
Ideal Weight Calculator for Weight Gain
Similarly, a reference-weight calculation should not be used alone to determine how much weight a person should gain.
A healthy weight-gain strategy may depend on:
- Current health
- Nutritional status
- Body composition
- Activity level
- Personal goals
Professional guidance may be appropriate for individualized health decisions.
Ideal Weight and Height
Height is one of the most important variables in traditional ideal body weight equations.
As height increases, the calculated reference weight generally increases as well.
However, the increase is not identical across formulas because each formula uses a different coefficient.
Ideal Weight Calculation Example Table
The following table shows illustrative values produced by the four formulas for selected heights.
| Height | Devine Male | Robinson Male | Miller Male | Hamwi Male |
|---|---|---|---|---|
| 160 cm | 56.9 kg | 57.7 kg | 60.4 kg | 56.2 kg |
| 165 cm | 61.4 kg | 61.4 kg | 63.2 kg | 61.6 kg |
| 170 cm | 65.9 kg | 65.2 kg | 66.0 kg | 67.0 kg |
| 175 cm | 70.5 kg | 68.9 kg | 68.8 kg | 72.3 kg |
| 180 cm | 75.0 kg | 72.7 kg | 71.5 kg | 77.6 kg |
These are formula-based reference estimates, not recommended personal weights. The underlying equations are documented in published reviews of ideal body weight formulas.
Ideal Weight Calculator vs BMI Calculator
These tools answer different questions.
Ideal Weight Calculator
Provides a reference weight estimate based primarily on height and gender using traditional equations.
BMI Calculator
Calculates:
BMI = Weight ÷ Height²
BMI requires both your current weight and height.
For more complete context, these tools can be viewed separately rather than treating one as a replacement for the other.
Ideal Weight Calculator vs BMR Calculator
A BMR Calculator estimates resting energy expenditure.
An Ideal Weight Calculator estimates reference body weight.
For example:
BMR → Estimated energy use at rest
Ideal Weight → Height-based reference weight
They measure completely different things.
Calculator Pool also provides a BMR Calculator and a Calorie Calculator.
Ideal Weight and Calorie Needs
Ideal weight and calorie requirements should not be confused.
Your estimated calorie needs depend on factors such as:
- BMR
- Physical activity
- Exercise
- Lifestyle
An ideal-weight formula primarily uses:
Height + Gender
Therefore, knowing an estimated reference weight does not automatically tell you how many calories you should consume.
Limitations of Ideal Weight Formulas
Traditional ideal body weight formulas have several limitations.
They generally do not fully account for:
- Muscle mass
- Body fat percentage
- Body composition
- Age
- Health conditions
- Physical activity
- Individual physiology
Research has also found that different formulas may produce different estimated weights for the same height.
Therefore, these formulas are best viewed as simple reference tools.
Are Ideal Weight Formulas Accurate?
They can provide a mathematically consistent estimate according to the formula being used, but that does not mean the result precisely represents an individual’s healthiest weight.
Accuracy depends on what you mean by “accurate.”
For a mathematical calculation, the formula can be applied correctly.
For personal health assessment, however, a height-based formula alone is limited.
How Height Is Converted for These Formulas
The traditional equations often use inches and a 5-foot reference point.
For example:
175 cm ÷ 2.54 ≈ 68.9 inches
Then:
68.9 − 60 ≈ 8.9 inches over 5 feet
That value is inserted into the relevant gender-specific equation.
Calculator Pool handles these conversions automatically.
Why Calculator Pool Shows an Average
Suppose the four formulas produce:
70 kg
69 kg
68 kg
72 kg
The simple average is:
(70 + 69 + 68 + 72) ÷ 4
= 69.75 kg
This can provide a convenient summary of the four estimates.
However, the average is not a new validated medical formula. It is simply an average of the displayed reference equations.
Why Use an Online Ideal Weight Calculator?
An online ideal weight calculator can save time when you want to compare several traditional formulas.
It can help you:
- Calculate reference weight
- Compare different formulas
- Understand height-based estimates
- Explore traditional ideal weight equations
- See formula differences
- Avoid manual calculations
Calculator Pool puts multiple estimates together on one page so you can compare them easily.
Benefits of Calculator Pool’s Ideal Weight Calculator
Calculator Pool’s free ideal weight calculator online provides four formula-based estimates:
Devine
Robinson
Miller
Hamwi
It also calculates their simple average.
This makes it easier to see that different formulas can produce different results instead of presenting one number as universally correct.
Common Ideal Weight Calculation Mistakes
Treating the Result as a Perfect Target
A formula-based estimate is not automatically your healthiest weight.
Using the Wrong Units
The Calculator Pool tool expects:
Height in centimetres
Comparing Different Formulas Without Checking the Method
Different websites may use different ideal body weight equations.
Ignoring Body Composition
Muscle mass and body fat can affect health without being represented directly by traditional height-based formulas.
Confusing Ideal Weight With BMI
BMI and ideal body weight are separate calculations.
Frequently Asked Questions
What is an Ideal Weight Calculator?
An Ideal Weight Calculator estimates reference body weight using height, gender, and one or more traditional ideal body weight formulas.
Is there one exact ideal weight for everyone?
No. Different formulas can produce different estimates, and individual healthy weight can vary considerably.
What formulas does Calculator Pool use?
Calculator Pool uses the Devine, Robinson, Miller, and Hamwi formulas.
What is the Devine formula?
For men:
50 + 2.3 × inches over 5 feet
For women:
45.5 + 2.3 × inches over 5 feet
What is the Robinson formula?
For men:
52 + 1.9 × inches over 5 feet
For women:
49 + 1.7 × inches over 5 feet
What is the Miller formula?
For men:
56.2 + 1.41 × inches over 5 feet
For women:
53.1 + 1.36 × inches over 5 feet
What is the Hamwi formula?
The traditional Hamwi equations use 106 lb plus 6 lb per inch over 5 feet for men and 100 lb plus 5 lb per inch over 5 feet for women.
Why do different ideal weight calculators show different results?
They may use different formulas, which have different constants and coefficients.
What is the difference between ideal weight and healthy weight?
Ideal weight is generally a formula-based reference estimate. Healthy weight is a broader concept influenced by body composition, age, health, lifestyle, and other factors.
Does the calculator use current body weight?
No. The current Calculator Pool Ideal Weight Calculator uses gender and height to produce its reference estimates.
Can I use the calculator for men?
Yes. Select Male and enter your height in centimetres.
Can I use the calculator for women?
Yes. Select Female and enter your height in centimetres.
Can I use this calculator for weight loss?
It can provide a reference estimate, but it should not be treated as a personalized weight-loss target or medical recommendation.
Can I use this calculator for fitness goals?
Yes, as a general reference, but fitness progress should not be judged by scale weight alone.
Is ideal weight the same as BMI?
No. BMI is calculated from height and current weight, while traditional ideal body weight formulas estimate a reference weight primarily from height and gender.
Is ideal weight the same as BMR?
No. BMR estimates resting energy expenditure, while ideal weight equations estimate a reference body weight.
Which ideal weight formula is the most accurate?
There is no universally superior formula for every individual or purpose. Different equations can produce different estimates.
Why does Calculator Pool show an average?
It provides a simple average of the four displayed formula estimates to make comparison easier. It is not a separate medically validated formula.
Is the Ideal Weight Calculator free?
Yes. Calculator Pool’s Ideal Weight Calculator is free to use online.
Related Calculators
You may also find these Calculator Pool tools useful:
BMI Calculator
Calculate Body Mass Index using your height and current weight.
BMR Calculator
Estimate basal metabolic rate using age, gender, height, and weight.
Calorie Calculator
Estimate daily calorie needs using BMR and activity level.
Average Calculator
Calculate the average, sum, count, minimum, and maximum of numerical values.
Percentage Calculator
Perform common percentage calculations.
Percentage Change Calculator
Calculate percentage increases and decreases between two values.
Ideal Weight Calculator – Quick Summary
An Ideal Weight Calculator provides a reference estimate of body weight based on height and gender.
Calculator Pool uses four commonly cited equations:
Devine
Robinson
Miller
Hamwi
These formulas can produce different results because they were developed using different assumptions and coefficients. Published research has documented substantial variation between ideal body weight equations.
Calculator Pool also provides a simple average of the four estimates:
Reference Average = (Devine + Robinson + Miller + Hamwi) ÷ 4
This average is provided for comparison and should not be interpreted as a medically defined ideal weight.
An ideal body weight estimate should also not be confused with BMI, BMR, or total daily calorie needs.
Use Calculator Pool’s free Ideal Weight Calculator online to compare traditional reference formulas and understand how height and gender affect the calculated estimates.
For personal health, nutrition, weight-management, or medical decisions, use the calculator as general information rather than as a substitute for individualized professional advice.