Ideal Weight Calculator

Enter your height and gender to find your ideal body weight across four widely used medical formulas — Robinson, Miller, Devine, and Hamwi. You'll also see your healthy BMI weight range so you can compare all results side by side and understand where your weight goals stand. Also try the Ideal Body Weight Calculator.

Disclaimer: This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any health-related decisions.

Gender *

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in
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years

Optional — some formulas adjust for age

Results

Devine Formula IBW

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Robinson (1983)

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Miller (1983)

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Hamwi (1964)

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Healthy BMI Range (Low)

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Healthy BMI Range (High)

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Results Table

Frequently Asked Questions

How much should I weigh for my height?

There is no single perfect answer — ideal weight depends on height, gender, age, frame size, and muscle mass. Medical formulas like Devine, Robinson, Miller, and Hamwi provide evidence-based estimates. The healthy BMI range (18.5–24.9) gives a broader weight window that is widely accepted by health professionals. See also our calculate Price per Weight.

Which ideal weight formula is the most accurate?

No single formula is universally best. The Devine formula is the most widely used in clinical settings, particularly for drug dosing. Robinson and Miller are refinements of Devine. Hamwi is commonly used by dietitians. Looking at all four together gives you a well-rounded picture of your ideal weight range.

What is the difference between ideal body weight (IBW) and healthy BMI weight?

IBW formulas give a single target number based on height and gender, while the healthy BMI range (18.5–24.9 BMI) gives a broader weight window. IBW formulas were originally developed for clinical and pharmaceutical purposes, whereas BMI ranges are used for general population health assessments.

Do these formulas account for muscle mass or body composition?

No — traditional IBW formulas (Robinson, Miller, Devine, Hamwi) are based only on height and gender. They do not account for muscle mass, bone density, or body fat percentage. Athletes or heavily muscled individuals may appear overweight by these standards even if they are very healthy. You might also find our Estimated Weight — Fish Weight useful.

How is the Devine formula calculated?

For males: IBW = 50 kg + 2.3 kg per inch over 5 feet. For females: IBW = 45.5 kg + 2.3 kg per inch over 5 feet. It was originally developed in 1974 for use in drug dosing calculations and remains the most commonly referenced IBW formula in medicine.

Is ideal body weight different for men and women?

Yes. All major IBW formulas use different base values for males and females at the same height. Men typically have a higher ideal weight due to greater average muscle mass and bone density. For example, at 5'10", the Devine formula gives about 75 kg for men versus 65.9 kg for women.

Can I use this calculator for children or teens?

These IBW formulas were designed for adults and are most reliable for individuals over 18. For children and adolescents, pediatric-specific growth charts from organizations like the CDC or WHO are more appropriate measures of healthy weight.

What should I do if my current weight is far from my ideal weight?

Ideal weight is a guideline, not a strict target. If there is a significant difference, consult a healthcare provider or registered dietitian before making dramatic changes. Sustainable diet adjustments and regular physical activity are the recommended approach — crash dieting or extreme caloric restriction can be harmful.