Adult reference tool

Ideal Weight Calculator

Estimate a practical adult reference weight from height and sex, compare four common IBW formulas, and see the healthy BMI weight range for the same height.

Use as context: Ideal body weight is a planning reference, not a diagnosis or a personal requirement. Muscle mass, frame size, age, and health history can change what is realistic for you.

Calculate Ideal Body Weight

Choose your unit system, enter height, select sex, and compare formula outputs instantly.

Average IBW estimate

Formula range

Lowest to highest value from the four IBW equations.

Healthy BMI range

Estimated from BMI 18.5 to 24.9 for the same height.

Next check

Add body composition

Use BMI, waist size, and body fat estimate for a fuller picture.

Formula	Result	Best read as

Formula comparison See Devine, Robinson, Miller, and Hamwi estimates side by side.

Healthy range Compare IBW with the BMI 18.5 to 24.9 weight range.

Metric or imperial Enter centimeters or feet and inches without switching pages.

Private The calculation runs in your browser and does not upload your inputs.

How to Use the Ideal Weight Calculator

The tool is designed for a fast reference check, not a strict goal-setting rule.

Enter height

Use centimeters or feet and inches. Height drives every IBW formula.

Select sex

Traditional IBW formulas use different constants for male and female adults.

Compare outputs

Read the average, formula range, and healthy BMI range together instead of picking one exact number.

What Formulas Are Included?

Ideal body weight formulas were originally created as adult reference equations. They are simple, but each gives a slightly different estimate.

Formula	Male equation	Female equation
Devine	50 kg + 2.3 kg per inch over 5 ft	45.5 kg + 2.3 kg per inch over 5 ft
Robinson	52 kg + 1.9 kg per inch over 5 ft	49 kg + 1.9 kg per inch over 5 ft
Miller	56.2 kg + 1.41 kg per inch over 5 ft	53.1 kg + 1.36 kg per inch over 5 ft
Hamwi	48 kg + 2.7 kg per inch over 5 ft	45.5 kg + 2.2 kg per inch over 5 ft

Why show several formulas? A single ideal weight number can feel more precise than it really is. Showing several formulas makes the uncertainty visible.

How to Interpret Your Result

A useful ideal weight estimate should guide a conversation, not replace one.

The average IBW estimate is a convenient midpoint across common formulas.
The formula range shows how much accepted equations can disagree.
The healthy BMI range is wider because BMI categories are designed for broad screening.
A muscular adult may sit above IBW while still having a healthy body composition.

Example Outputs

These examples show why a range is usually more useful than one exact target.

170 cm female

Average IBW around 62 kg, with a broader healthy BMI range around 53.5-72.0 kg.

5 ft 10 in male

Average IBW around 72 kg, while the healthy BMI range extends wider for screening.

Shorter or taller adults

Formula differences grow as height moves farther from 5 ft, so read the range carefully.

Limitations and Safety Notes

This is a health-adjacent reference page, so the limitations matter as much as the output.

Not a diagnosis

The calculator cannot judge health, nutrition status, or medical risk.

Frame and muscle matter

People with larger frames or more muscle may have a healthy weight above the formula average.

Pregnancy and youth are different

Pregnant people, children, and teens should not use adult IBW formulas as a target.

Practical next step: If the number surprises you, compare it with BMI, waist circumference, body fat percentage, trend photos, and professional advice when relevant.

Related Tools

Use these pages to add context before treating any one number as final.