Online Ideal Weight Calculator

What Is This Tool?

The Ideal Weight Calculator estimates a healthy body weight for a given gender, age, and height. For most adult heights it shows four classic formula estimates — Robinson, Miller, Devine, and Hamwi — alongside a healthy weight range based on BMI. For shorter heights, and for children and teens aged 2 to 20, it instead presents a healthy weight range drawn from World Health Organization and CDC growth references. You can work in metric or imperial units and download the result as a PDF. Every figure is a general estimate, not a personal target or medical advice.

How to Use This Tool?

• Select your gender and preferred units.
• Enter your age and height.
• Click Calculate to see the formula estimates or a healthy range.
• Click Download Result as PDF to save a copy.

Key Features

• Estimates ideal weight using four formulas: Robinson, Miller, Devine, and Hamwi.
• Shows a healthy weight range based on a normal BMI band.
• Switches to a WHO or CDC healthy range for shorter heights and for ages 2 to 20.
• Accepts gender, age, and height, with a metric and imperial toggle.
• Download the full set of estimates as a PDF.

Examples

• A man at 182 cm gives ideal weights of about 163.5 (Robinson), 160.1 (Miller), 169.3 (Devine), and 175.2 lbs (Hamwi).
• For that same height, the healthy BMI range comes out at roughly 135.1 to 182.6 lbs.
• A height below 152.4 cm shows a healthy weight range in words instead of the formula table.
• For a child or teen aged 2 to 20, the result is a CDC-based healthy weight range.

Common Use Cases

• Getting a general reference point for a healthy weight at a given height.
• Comparing how the different formulas estimate ideal weight.
• Viewing a healthy weight range rather than a single number.
• Checking a healthy weight range for a child or teenager.
• Adding context to personal fitness or health goals.

Tips & Best Practices

• Enter your height accurately, since every estimate depends on it.
• Treat the formula numbers as population averages, not exact personal targets.
• Use the BMI range as a healthy band rather than aiming for one figure.
• Remember the estimates do not account for muscle, frame size, or body composition.
• Speak with a healthcare professional before setting any weight goal.

Limitations

• The formulas are population averages and do not account for muscle mass, frame size, or body composition.
• The four formulas use only height and gender, so they do not adjust for age.
• For heights below about 152.4 cm, the formulas are not applied and a healthy range is shown instead.
• It is for general information only, is not a personal target, and is not medical advice.

Frequently Asked Questions

Which formulas does it use?

It uses the Robinson, Miller, Devine, and Hamwi formulas, and also shows a healthy weight range based on BMI.

Why are there several different numbers?

Each formula was developed differently, so they give slightly different estimates, and the BMI range shows a healthy band rather than one value.

Does it work for children?

Yes. For ages 2 to 20 it shows a healthy weight range based on CDC growth references rather than the adult formulas.

Can I save the result?

Yes. Click Download Result as PDF to save the estimates or healthy range as a file.

Key Terminology

Ideal body weight

An estimated healthy weight for a given height and gender, based on standard formulas.

Body Mass Index (BMI)

A ratio of weight to height squared, used here to define a healthy weight range.

Devine formula

A widely used formula, originally for medication dosing, that estimates ideal weight from height.

Hamwi formula

An early ideal-weight formula that adds a fixed amount of weight for each inch above five feet.

Healthy weight range

A band of weights considered healthy for a height, rather than a single ideal figure.

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