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Accurate Ideal Weight Calculator

Discover your ideal body weight using 5 scientifically-backed formulas with interactive visualizations.

cm
yrs

Wrist measurement guide

Small
Medium
Large
♂ Men
< 6.5"
16.5 cm
6.5–7.5"
16.5–19 cm
> 7.5"
19 cm
♀ Women
< 5.5"
14 cm
5.5–6.5"
14–16.5 cm
> 6.5"
16.5 cm

Measure wrist at the narrowest point with a tape measure

Your Ideal Weight

Average Ideal Weight
68.5 kg
Range: 63.2 — 73.8 kg
40 kg Healthy Zone 120 kg

Results by Formula

Devine (1974) Most Used
—
Standard clinical formula
Robinson (1983) Popular
—
Slightly conservative estimates
Miller (1983) Accurate
—
Lower-bound reference
Hamwi (1964) Classic
—
Traditional clinical method
BMI Healthy Range (18.5 — 24.9) WHO Standard
—
Weight range for healthy BMI based on your height
Check your BMI →
Use our BMI Calculator to see your weight classification

How the Formulas Work

Devine (1974)

Most widely used in clinical settings. Originally developed for drug dosage calculations. Uses a linear formula based on height over 5 feet.

Robinson (1983)

Slightly more conservative than Devine. Produces lower estimates, especially for taller individuals. Good for smaller-framed bodies.

Miller (1983)

Gives the lowest estimates among all formulas. Best as a lower-bound reference. Often used alongside other formulas for a balanced range.

Hamwi (1964)

Classic clinical method. Uses steeper height scaling than Devine. Tends to give slightly higher targets, especially for taller individuals.

All formulas calculate ideal body weight based on height and gender only. This calculator adds body frame size (±10%) and averages all four results for a more balanced target. The BMI range uses the WHO healthy range (18.5–24.9) for your height.

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Ideal Weight Knowledge Base

Ideal body weight (IBW) is a target weight range associated with reduced health risks and optimal physiological function. It is typically calculated using height, gender, age, and body frame size. The concept originated in clinical settings for drug dosing and nutritional planning. Multiple formulas exist because body composition varies across populations, so no single formula is universally perfect.
The Devine formula (1974) is the most widely used in clinical practice, originally developed for drug dosage calculations. However, no single formula is universally "most accurate" because ideal weight depends on muscle mass, bone density, and body composition — factors not captured by height alone. The best approach is to use the average of multiple formulas (as this calculator does) and adjust for your individual body frame size.
Body frame size adjusts the ideal weight range based on bone structure. A person with a small frame (narrow shoulders, thin wrists) will have a lower ideal weight, while someone with a large frame (broad shoulders, thick wrists) will have a higher ideal weight. Frame size typically adds or subtracts ±10% from the baseline calculation. You can estimate your frame by measuring your wrist circumference relative to your height.
BMI measures the relationship between weight and height to classify you into a category (underweight, normal, overweight, obese). Ideal weight formulas give you a specific target weight in kg/lbs. BMI is useful for population-level screening, but ideal weight is more actionable — it tells you exactly what to aim for. This calculator combines both approaches: formula-based targets and the WHO BMI healthy range for your height.
While the classic Devine, Robinson, Miller, and Hamwi formulas don't directly include age, research shows that ideal weight tends to shift slightly with age due to changes in muscle mass, bone density, and metabolism. After age 40, many health professionals recommend targeting the lower end of the ideal weight range to reduce strain on joints and cardiovascular systems. This calculator uses the BMI method to provide age-adjusted recommendations.
The Average Ideal Weight displayed at the top is calculated by taking the simple arithmetic mean of all four formula results:
Average = (Devine + Robinson + Miller + Hamwi) / 4
Each formula is first adjusted by your selected body frame size — small frame multiplies by 0.9, large frame by 1.1, and medium stays unchanged. This average provides a single balanced target weight that accounts for the strengths and biases of each individual formula, giving you a more reliable middle-ground estimate.