Which formula is the most accurate?

No single formula is universally best. The Robinson formula is commonly used in clinical settings. Using the average of all four formulas gives a reasonable range.

Why do the formulas give different results?

Each formula was developed using different population samples and methodologies. The differences reflect the natural variation in what constitutes a healthy weight.

Does ideal weight change with age?

These formulas don't account for age, but body composition does change with aging. Older adults may carry slightly more weight while still being healthy.

Ideal Weight Calculator

Find your ideal body weight range using four scientifically recognized formulas.

Gender

Height (cm)

What is Ideal Body Weight?

Ideal body weight (IBW) is not a single number but a range based on your height and gender. Several formulas have been developed over decades to estimate a healthy target weight. These formulas serve as general guidelines — your actual ideal weight depends on body composition, muscle mass, and individual factors.

Ideal Weight Formulas

Robinson Formula (1983)

Males: 52 + 1.9 × (height in inches – 60)

Females: 49 + 1.7 × (height in inches – 60)

Miller Formula (1983)

Males: 56.2 + 1.41 × (height in inches – 60)

Females: 53.1 + 1.36 × (height in inches – 60)

Devine Formula (1974)

Males: 50 + 2.3 × (height in inches – 60)

Females: 45.5 + 2.3 × (height in inches – 60)

Hamwi Formula (1964)

Males: 48 + 2.7 × (height in inches – 60)

Females: 45.5 + 2.2 × (height in inches – 60)

Limitations

These formulas were developed for adults of average build and don't account for muscle mass, bone density, ethnicity, or age. Athletes and very muscular individuals may have an "ideal weight" higher than these estimates. Use them as general guidelines, not strict targets.

Frequently Asked Questions

The Robinson formula is often considered the most accurate for general use. However, no single formula is perfect for everyone. Using the average of all four formulas provides a reasonable range. For personalized advice, consult a healthcare professional.

Each formula was developed from different population studies, time periods, and methodologies. The variation between them represents the inherent uncertainty in defining "ideal" weight. The range they provide is actually more useful than any single exact number.

These formulas don't account for age, but research suggests that slightly higher weight may be healthier for older adults (60+). Muscle mass naturally decreases with age, and some extra weight can be protective during illness. The BMI range of 18.5-25 remains the general target for adults.