Ideal Weight Calculator

Find a practical adult ideal body weight by height, age, gender, and frame size. This page compares four classic formulas, shows a healthy BMI weight range, and gives a simple daily calorie estimate for the reference zone.

Calculator Formula table Ideal weight chart FAQ References

Age

28Years

Age does not change the classic ideal body weight formulas. It is used only for the simple calorie estimate shown in the results.

Gender

Male
Uses the male version of each formula. Female
Uses the female version of each formula.

Height

180cm

The calculator works in kilograms and pounds, and it converts metric and imperial height entries automatically.

Frame Size

Small Frame
Shows a slightly lighter planning adjustment. Medium Frame
Keeps the classic formulas at their standard reference level. Large Frame
Shows a slightly heavier planning adjustment.

How to Read the Result

The four formulas below were originally created as clinical reference tools, especially for medication and weight-for-height guidance. This page keeps those formulas transparent, then adds a healthy BMI range and a simple frame-size adjustment to make the answer more practical for everyday planning.

Formula spreadThe blue headline range shows the lowest and highest value across the four classic formulas.

BMI rangeUse the healthy BMI range as the wider context instead of chasing only one number.

Calorie estimateDaily calories estimate the energy needed to maintain the reference zone at a sedentary baseline.

Your ideal weight results

Four classic formulas, one practical reference zone, and a healthy BMI comparison.

Reference zone

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Enter your details to see the reference zone.

4 formula comparison Adult healthy BMI range selected unit output

Average reference

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Healthy BMI range

—BMI 18.5 - 24.9 for adults

Estimated daily calories

—Sedentary maintenance estimate

Selected frame size

Medium frameSmall and large frames shift the classic formula output slightly.

Method 1: Hamwi

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Classic height-based reference formula often quoted in pounds and kilograms.

Method 2: Devine

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One of the most commonly cited ideal body weight formulas in clinical practice.

Method 3: Robinson

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A refinement based on height-weight table analysis and widely used in comparisons.

Method 4: Miller

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Another 1983 variation that gives a useful side-by-side contrast with the others.

Formula comparison chart

Each bar shows the selected frame-adjusted reference weight for the same height and sex.

Hamwi

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Devine

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Robinson

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Miller

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Reference values are informational. They are useful for comparison, but they are not the same as a personalised medical target.

Why this ideal weight page is more useful

Instead of showing only one answer, the page gives a fuller picture that is easier to trust and easier to use.

Four formula comparisonSee Hamwi, Devine, Robinson, and Miller together instead of relying on a single result.

Healthy weight contextCheck the adult healthy BMI range side by side with the formula output for the same height.

Transparent limitationsLearn what ideal body weight formulas do well, where they fall short, and how to interpret them safely.

Quick planning extrasUse frame-size adjustment, daily calories, worked examples, formula tables, FAQs, and related calculators on one page.

What does “ideal weight” actually mean?

An ideal weight calculator gives a reference point based mainly on your height and sex. It can answer the popular question, “How much should I weigh?” but the best answer is usually a range, not one strict number. That is why this page shows the spread across multiple formulas and also includes the healthy BMI band for adults.

Ideal body weight formulas became popular because they were simple, repeatable, and helpful in clinical settings. Over time, they also became popular in fitness, wellness, and general health searches. Even so, the number on the scale is only one piece of the picture. Muscle mass, body fat distribution, age, medical history, training level, pregnancy, and ethnicity can all change what a healthy weight looks like in real life.

Use the formula comparison to understand your height-based reference zone.
Use the healthy BMI range to see a wider adult weight band.
Use the calorie estimate as a simple maintenance reference, not a diet prescription.
Use your current health, strength, fitness, and lab values to decide what matters most for you.

How to use this calculator well

1. Start with your height Height drives all four classic formulas. Enter it in centimetres or switch to feet and inches.

2. Choose sex and frame size Sex changes the formula constants. Frame size on this page adds a light planning adjustment around the classic formula values.

3. Compare the zone, not only one number The headline zone shows the lowest and highest result across Hamwi, Devine, Robinson, and Miller.

4. Check the healthy BMI range too Adults usually get a better planning reference from the formula spread plus the BMI 18.5 to 24.9 range together.

Ideal body weight formula table

The four classic formulas below are the ones most commonly shown on high-ranking ideal weight calculator pages and in everyday clinical references. All of them estimate body weight from height, and all of them should be treated as reference tools rather than personal rules.

Formula	Men	Women	What it helps with
Hamwi (1964)	48 kg + 2.7 kg per inch over 5 ft	45.5 kg + 2.2 kg per inch over 5 ft	Classic medical reference formula often shown in both pounds and kilograms.
Devine (1974)	50 kg + 2.3 kg per inch over 5 ft	45.5 kg + 2.3 kg per inch over 5 ft	One of the most widely cited ideal body weight formulas in pharmacy and health tools.
Robinson (1983)	52 kg + 1.9 kg per inch over 5 ft	49 kg + 1.7 kg per inch over 5 ft	A practical refinement based on height-weight table analysis.
Miller (1983)	56.2 kg + 1.41 kg per inch over 5 ft	53.1 kg + 1.36 kg per inch over 5 ft	Useful as a fourth comparison point when you want a fuller formula range.

Ideal weight chart by height

This quick chart shows the average of the four formulas for men and women at medium frame, along with the adult healthy BMI range for the same height. It is a quick reference chart, not a rigid target chart.

Height	Men average	Women average	Healthy BMI range
150 cm 4'11"	49.6 kg 109.3 lb	46.5 kg 102.5 lb	41.6 - 56.0 kg
155 cm 5'1"	53.7 kg 118.3 lb	50.2 kg 110.7 lb	44.4 - 59.8 kg
160 cm 5'3"	57.8 kg 127.4 lb	53.9 kg 118.9 lb	47.4 - 63.7 kg
165 cm 5'5"	61.9 kg 136.4 lb	57.7 kg 127.1 lb	50.4 - 67.8 kg
170 cm 5'7"	65.9 kg 145.4 lb	61.4 kg 135.3 lb	53.5 - 72.0 kg
175 cm 5'9"	70.0 kg 154.4 lb	65.1 kg 143.5 lb	56.7 - 76.3 kg
180 cm 5'11"	74.1 kg 163.4 lb	68.8 kg 151.7 lb	59.9 - 80.7 kg
185 cm 6'1"	78.2 kg 172.4 lb	72.5 kg 159.9 lb	63.3 - 85.2 kg
190 cm 6'3"	82.3 kg 181.4 lb	76.3 kg 168.1 lb	66.8 - 89.9 kg
195 cm 6'5"	86.4 kg 190.5 lb	80.0 kg 176.3 lb	70.3 - 94.7 kg
200 cm 6'7"	90.5 kg 199.5 lb	83.7 kg 184.5 lb	74.0 - 99.6 kg

Worked examples

Examples make it easier to understand what the formulas are doing. The numbers below use the standard medium-frame version of each equation.

Example 1: 180 cm male

At 180 cm, the four classic formulas cluster fairly tightly. Hamwi estimates 77.3 kg, Devine estimates 75.0 kg, Robinson estimates 72.6 kg, and Miller estimates 71.5 kg. The adult healthy BMI range for the same height is 59.9 to 80.7 kg.

Example 2: 165 cm female

At 165 cm, Hamwi estimates 56.4 kg, Devine estimates 56.9 kg, Robinson estimates 57.4 kg, and Miller estimates 59.8 kg. The adult healthy BMI range for the same height is 50.4 to 67.8 kg.

Male average74.1 kg

Female average57.7 kg

BMI contextAlways compare with the wider healthy range

Important limitations to know

Ideal body weight formulas are useful because they are simple, fast, and easy to compare. But they do not directly measure body fat, lean mass, waist size, athletic build, or medical complexity. That is why a highly trained athlete and a sedentary adult at the same height can both look healthy while falling in different places relative to a formula result.

The formulas are adult reference tools, not growth tools for children or teens.
They estimate weight from height, not from body composition.
BMI is useful for screening, but BMI is also not a diagnosis by itself.
Pregnancy, older age, high muscle mass, chronic illness, and recent weight change can all change how the number should be interpreted.
For a better health picture, combine weight with waist size, activity, sleep, nutrition, lab work, and medical guidance when needed.

Updated April 2026. This page is written for adults. Children and teens should use age-specific BMI charts instead of adult formula references.

Frequently asked questions

These are the most common questions people ask before choosing an ideal weight or healthy weight target.

What is an ideal weight calculator?

An ideal weight calculator estimates a reference body weight from your height and sex using established formulas. This page also shows a healthy BMI range so you can compare single-number formula estimates with a broader weight band.

Is ideal weight a single exact number?

No. Healthy weight is better treated as a range. Different formulas return slightly different answers, and body composition, frame size, muscle mass, age, and medical history all matter.

Which ideal body weight formula is best?

No single formula is perfect for everyone. Devine is widely cited in clinical settings, while Robinson, Hamwi, and Miller provide useful comparison points. Looking at all four together gives a more balanced reference.

Why does this page include a healthy BMI range?

A healthy BMI range gives a broader context than a single formula result. It helps you see whether your height corresponds to a wider weight band rather than chasing only one number.

Does age change ideal body weight formulas?

The classic formulas on this page use height and sex, not age. Age is included here for the calorie estimate only, because energy needs change over time.

Should I use ideal weight as a strict goal?

Use it as a reference, not a rule. If you are very muscular, older, pregnant, an athlete, or managing a medical condition, speak with a qualified healthcare professional before setting a target weight.

More health calculators

Compare your ideal weight result with related health and nutrition tools.

References

These sources were used for the formula background, BMI ranges, healthy-weight context, and interpretation guidance on this page.

Reference note

This page also follows the user-facing content patterns seen on leading ideal weight calculator pages: clear input controls, multiple formula outputs, healthy BMI comparison, formula transparency, worked examples, FAQ sections, and related internal links. The medical and health interpretation on this page is grounded in public health and peer-reviewed sources listed here.

Always discuss major weight changes, medication dosing, pregnancy, eating disorder history, or chronic disease with a qualified healthcare professional.