Ideal Weight Calculator - Find Your Healthy Weight Range

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Feet / Inches Centimeters

Height

Body Frame Size

Average Ideal Weight

By Formula

Devine (1974)

Hamwi (1964)

Robinson (1983)

Miller (1983)

Healthy Weight Range (BMI 18.5 – 24.9)

The Four Ideal Weight Formulas

Devine Formula (1974)

Men: 50.0 kg + 2.3 kg per inch over 5 feet
Women: 45.5 kg + 2.3 kg per inch over 5 feet

Hamwi Formula (1964)

Men: 48.0 kg + 2.7 kg per inch over 5 feet
Women: 45.5 kg + 2.2 kg per inch over 5 feet

Robinson Formula (1983)

Men: 52 kg + 1.9 kg per inch over 5 feet
Women: 49 kg + 1.7 kg per inch over 5 feet

Miller Formula (1983)

Men: 56.2 kg + 1.41 kg per inch over 5 feet
Women: 53.1 kg + 1.36 kg per inch over 5 feet

BMI-Based Healthy Range

Min weight = 18.5 × height(m)²
Max weight = 24.9 × height(m)²

Frequently Asked Questions

No. 'Ideal weight' formulas were originally developed for medical purposes like drug dosing, not as personal health targets, and different formulas give noticeably different results for the same person. A healthy weight is better thought of as a range than a single number, and it varies with muscle mass, frame size, age, and overall health. This calculator shows several formulas side by side specifically so you can see the range rather than fixating on one figure.

All four estimate ideal body weight from height and sex, but use slightly different base weights and per-inch increments. The Devine formula (1974) is the most widely used in clinical settings, originally for calculating drug dosages. Hamwi (1964) is common in dietetics. Robinson (1983) and Miller (1983) were later refinements that tend to give slightly lower values than Devine for taller individuals. Differences between them are typically a few kilograms.

People with larger skeletal frames naturally carry more weight in bone and supporting structure. A common adjustment adds roughly 10% for a large frame and subtracts roughly 10% for a small frame. Frame size is often estimated by wrist circumference relative to height, or by measuring elbow breadth. This calculator applies that adjustment when you select a frame size.

With caution. Ideal weight formulas use only height and sex, so they cannot account for muscle mass. Muscular athletes frequently weigh well above their calculated 'ideal weight' while having low body fat and excellent health markers. For athletes and regular strength trainers, body fat percentage is a far more meaningful measurement than either ideal body weight or BMI.

Ideal Weight Calculator - Four Medical Formulas Compared

"Ideal body weight" formulas have been used in medicine since the 1960s, originally developed not as personal fitness targets but as practical tools for calculating drug dosages and assessing nutritional status. This calculator runs your height through the four most widely cited formulas - Devine, Hamwi, Robinson and Miller - and also shows the BMI-based healthy weight range, so you can see a realistic range rather than a single misleading number.

Important context: These formulas use only height and sex - they cannot account for muscle mass, body composition, or individual health. Treat the results as a rough reference range, not a target.

Why the Formulas Disagree

Each formula was developed from different population data and uses a different base weight and per-inch increment. For a 5'10" man, Devine gives about 73 kg while Miller gives about 70 kg - a meaningful gap for the same person. Rather than picking one formula as "correct," it's more useful to look at the spread across all four, which naturally produces a range. Most people's genuinely healthy weight falls somewhere within (or near) that spread.

Limitations Worth Knowing

No muscle adjustment: Athletes and regular strength trainers routinely exceed these figures while being extremely healthy.
Not age-adjusted: Body composition changes with age, but these formulas treat a 25-year-old and a 65-year-old of the same height identically.
Frame size is an estimate: The ±10% frame adjustment is a rough convention, not a precise measurement.
Better metrics exist: Body fat percentage and waist circumference correlate more closely with actual health outcomes than ideal weight formulas or BMI alone.

How this calculator works, and where the numbers come from

The Ideal Weight Calculator applies the standard formula for this calculation to the values you enter and updates the result as you type. The calculation itself happens in your browser, and the page explains the method so you can check any result by hand.

Please note: This tool gives general estimates based on published population formulas. It is not medical advice and does not replace assessment by a doctor, dietitian or other qualified professional.

Sources and further reading

Learn more

Read our guide: What BMI Tells You, and What It Quietly Misses

Last reviewed: October 6, 2026 by the CalcQube Editorial Team. See our editorial policy for how we build and check calculators, or report an error.

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