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Ideal Weight Calculator

Calculate your ideal body weight using four scientific formulas. Devine, Robinson, Miller, and Hamwi — see where you are and what your target range looks like.

BMI: 26.0

How is ideal weight calculated?

Ideal weight formulas are based on height and sex. The four most widely referenced formulas — Devine (1974), Robinson (1983), Miller (1983), and Hamwi (1964) — were all originally developed for clinical medicine to help calculate drug dosages, not as weight-management targets.

Because the formulas produce slightly different results, their average is typically the most reliable single estimate. It is important to remember that ideal weight is a reference value, not an absolute goal. Body composition, muscle mass, and metabolic health are more meaningful health indicators than the number on the scale.

The four ideal weight formulas explained

Devine formula (1974)

Most popular

Male: 50 + 2.3 × (height in inches above 5 feet)

Female: 45.5 + 2.3 × (height in inches above 5 feet)

Originally developed to calculate digoxin drug doses. The most widely used formula in clinical medicine and the basis for most online calculators.

Robinson formula (1983)

Male: 52 + 1.9 × (height in inches above 5 feet)

Female: 49 + 1.7 × (height in inches above 5 feet)

Typically gives a slightly lower result than Devine. Developed to update the Devine formula with more modern data.

Miller formula (1983)

Male: 56.2 + 1.41 × (height in inches above 5 feet)

Female: 53.1 + 1.36 × (height in inches above 5 feet)

Uses the smallest height-increment coefficient of the four — giving a higher base value for shorter individuals but growing more slowly with height.

Hamwi formula (1964)

Oldest

Male: 48 + 2.7 × (height in inches above 5 feet)

Female: 45.5 + 2.2 × (height in inches above 5 feet)

The oldest of the four formulas. Simple and quick to calculate by hand. Gives men a slightly higher result than the other formulas.

Frequently asked questions

Ideal body weight is an estimated optimal body weight based on height and sex. It is a reference range rather than a precise target — weights in this range are associated with the lowest health risks. Different formulas produce slightly different results, and in practice a healthy weight is individual. Muscle mass, bone density, and body composition all influence what weight is optimal for you.
The most widely used formulas are Devine (1974), Robinson (1983), Miller (1983), and Hamwi (1964). All are based on height and sex. The Devine formula is most commonly used in clinical medicine. Because the formulas give slightly different results, their average is often the best single estimate.
Not exactly. Ideal weight is a calculated estimate; healthy weight is a broader concept. For example, a muscular athlete can significantly exceed their ideal weight without being unhealthy. The BMI normal range (18.5–24.9) roughly corresponds to ideal weight, but body composition is a more meaningful health indicator than weight alone.
All three formulas are based on height but use slightly different coefficients. Devine (1974) is the oldest and most widely used in clinical medicine. Robinson (1983) generally gives a slightly lower result. Miller (1983) uses the smallest height increment coefficient, giving a higher base value for shorter individuals but growing more slowly with height. Hamwi (1964) is the simplest. All were originally developed for drug-dosage calculations, not weight management.
Exceeding ideal weight does not automatically indicate a health risk. If you are muscular or have a larger frame, your weight can be well above the ideal range while you remain perfectly healthy. More important than the number on the scale are body composition, waist circumference, and metabolic health markers.
For a woman who is 170 cm tall, ideal weight is approximately 63 kg by the Devine formula, 60 kg by Robinson, and 64 kg by Miller. For a man at the same height the formulas give roughly 67 kg, 65 kg, and 68 kg respectively. The BMI normal range (18.5–24.9) corresponds to 53–72 kg at 170 cm.

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