Healthy Weight Calculator

A healthy weight depends on your height, sex, age, and body composition. The most widely used method is the Body Mass Index (BMI), where a BMI between 18.5 and 24.9 is considered healthy. For example, a 5'9" male has a healthy weight range of approximately 59–80 kg (130–176 lbs).

For adults aged 20 and older, a BMI between 18.5 and 24.9 is classified as a healthy weight. Below 18.5 is underweight, 25.0–29.9 is overweight, and 30.0 or above is classified as obese. This calculator uses the healthy BMI range to determine your minimum and maximum healthy weight.

These are four separate clinical formulas developed between 1964 and 1983 to estimate ideal body weight, primarily used in medical settings for drug dosing. They each use height and sex to produce a single target weight. The results differ slightly, so this calculator shows all four for comparison alongside the broader healthy BMI range.

Not exactly. Ideal body weight (IBW) formulas like Robinson or Devine give a single target number, while the healthy BMI range gives a minimum-to-maximum range. The BMI range is generally considered more practical for the general public, while IBW formulas are more commonly used in clinical and pharmaceutical contexts.

Yes. All four ideal weight formulas (Robinson, Miller, Devine, Hamwi) use sex as a variable because males and females tend to differ in bone density, muscle mass, and body composition at the same height. The BMI-based healthy weight range uses height only and does not differ by sex.

BMI is a useful screening tool but not a complete measure of health. It does not account for muscle mass, bone density, fat distribution, age, or ethnicity. Athletes may have a high BMI due to muscle without being overweight, while older adults may have a normal BMI with excess body fat. Always consider BMI alongside other health indicators and consult a healthcare professional.

This calculator is designed for adults aged 18 and older. For children and teenagers aged 2–19, BMI is interpreted differently using age- and sex-specific percentile charts. The CDC provides a dedicated BMI calculator for children and teens for that age group.

The formula is: Weight (kg) = BMI × Height (m)². For a healthy weight range, substitute BMI = 18.5 for the minimum and BMI = 24.9 for the maximum. For example, for a height of 1.75 m: minimum = 18.5 × 1.75² ≈ 56.7 kg, maximum = 24.9 × 1.75² ≈ 76.3 kg.