Ideal Weight Calculator
Estimate your ideal body weight using four scientifically-established formulas.
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Select your gender
How This Calculator Works
This calculator estimates your ideal body weight using four well-established formulas from medical and nutrition research. Each formula uses your height and gender to produce an estimate based on population-level data.
Devine Formula (1974)
Males: 50 + 2.3 kg per inch over 5 feet · Females: 45.5 + 2.3 kg per inch over 5 feet
Originally developed for calculating medication dosages. The most widely cited formula despite its simplicity.
Robinson Formula (1983)
Males: 52 + 1.9 kg per inch over 5 feet · Females: 49 + 1.7 kg per inch over 5 feet
A refinement of the Devine formula using updated population data from the early 1980s.
Miller Formula (1983)
Males: 56.2 + 1.41 kg per inch over 5 feet · Females: 53.1 + 1.36 kg per inch over 5 feet
Tends to produce slightly higher estimates, especially for shorter individuals. Uses the smallest per-inch increment.
Hamwi Formula (1964)
Males: 48 + 2.7 kg per inch over 5 feet · Females: 45.5 + 2.2 kg per inch over 5 feet
One of the earliest modern ideal weight formulas. Uses the largest per-inch increment for males.
The calculator also shows your healthy BMI weight range (BMI 18.5-24.9), which represents the weight range associated with lower health risks at the population level. The average across all four formulas typically falls within this range.
Frequently Asked Questions
Why are there different ideal weight formulas?
Each formula was developed by different researchers at different times using different study populations. Devine (1974) was originally created for drug dosage calculations, Robinson (1983) and Miller (1983) refined those estimates with broader population data, and Hamwi (1964) was one of the earliest modern formulas. Using all four gives you a range rather than a single number, which better reflects the reality that "ideal weight" varies between individuals.
Is ideal weight the same for everyone?
No. Ideal weight depends on many factors beyond height and gender, including body composition, muscle mass, bone density, age, and genetics. A muscular athlete may weigh more than the "ideal" range and be perfectly healthy. These formulas provide estimates based on population averages and should be used as general guidelines, not strict targets.
Which ideal weight formula is most accurate?
No single formula is definitively "most accurate" for all individuals. Research suggests Robinson and Miller tend to produce more moderate estimates, while Devine can overestimate for shorter individuals. The average across all four formulas provides the most balanced estimate. For personalized guidance, consult a healthcare professional who can assess your body composition directly.
How does the healthy BMI range compare to ideal weight?
The healthy BMI range (18.5-24.9) represents the weight range associated with lower health risks at the population level. The ideal weight formulas estimate a single target within or near this range. Both tools are complementary — the BMI range shows the full healthy spectrum, while the formulas suggest where most people of your height tend to fall.
Should I use ideal weight as a strict target?
No. Ideal weight formulas are best used as general reference points. A healthy weight is one where your blood markers, energy levels, and physical function are good — regardless of what a formula says. Focus on body composition (muscle vs. fat), fitness, and how you feel rather than chasing a specific number on the scale.
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