Healthy Weight for Height Calculator

A general healthy weight range is determined using Body Mass Index (BMI). A BMI between 18.5 and 24.9 is considered healthy for most adults. For example, a person who is 5 ft 9 in tall has a healthy weight range of roughly 57–79 kg (125–174 lbs). Keep in mind that BMI does not account for muscle mass, bone density, or body composition.

There are several popular clinical formulas: the Robinson (1983), Miller (1983), Devine (1974), and Hamwi (1964) formulas. Each was developed for medical use — such as drug dosing — and produces a slightly different result. This calculator shows all four so you can compare them side by side.

BMI is a number calculated from your weight and height (kg ÷ height in meters²). It is commonly used to classify weight status: below 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30+ is obese. BMI is a useful screening tool but does not directly measure body fat.

A healthy BMI of 18.5–24.9 is one common benchmark. You can also consider waist circumference, waist-to-hip ratio, and body fat percentage for a more complete picture. Consulting a healthcare provider gives the most accurate personal assessment.

For a woman who is 5 ft 4 in (163 cm) tall, the healthy BMI weight range is approximately 49–65 kg (108–143 lbs). Formula-based ideal weights typically fall near the middle of this range, around 54–57 kg depending on which formula is used.

BMI-based healthy ranges remain largely the same across adult ages. However, some experts suggest that adults over 65 may benefit from a slightly higher BMI (25–27) to help maintain muscle mass and bone density. Children and teenagers use age- and sex-specific BMI percentile charts rather than fixed ranges.

BMI does not distinguish between fat and muscle, so athletes with high muscle mass may be classified as overweight even if they are very healthy. It also does not account for where fat is stored — abdominal fat carries more health risk than fat stored in other areas. BMI is best used as one of several health indicators.

There is no single universal 'ideal' weight. A good starting point is the healthy BMI range (18.5–24.9) combined with one of the clinical formulas shown in this calculator. A doctor or dietitian can help you set a realistic, health-focused weight goal that accounts for your body composition, lifestyle, and medical history.