Ideal Body Weight Calculator

How to Use the Ideal Body Weight Calculator

The Ideal Body Weight Calculator estimates your target weight based on your height and gender using several established medical formulas. These formulas were developed for clinical applications like drug dosing and nutritional assessments and provide useful reference points for healthy weight goals.

How It Works

Enter your height and select your biological sex. The calculator applies four well-known formulas and displays a range of ideal weights. No single formula is perfect, so seeing multiple estimates gives you a more complete picture of where a healthy weight might fall for your frame.

The Formulas

Devine Formula (1974): Men: 50 + 2.3 × (height in inches - 60). Women: 45.5 + 2.3 × (height in inches - 60). This is the most widely used formula in clinical settings.

Robinson Formula (1983): Men: 52 + 1.9 × (height in inches - 60). Women: 49 + 1.7 × (height in inches - 60).

Miller Formula (1983): Men: 56.2 + 1.41 × (height in inches - 60). Women: 53.1 + 1.36 × (height in inches - 60).

Hamwi Formula (1964): Men: 48 + 2.7 × (height in inches - 60). Women: 45.5 + 2.2 × (height in inches - 60).

Understanding the Results

For a man who is 5 feet 10 inches (70 inches) tall, the formulas give: Devine = 73 kg (161 lbs), Robinson = 71 kg (156 lbs), Miller = 70.3 kg (155 lbs), Hamwi = 75 kg (165 lbs). The healthy range is approximately 155-165 lbs. A 10% range above and below these values is generally considered acceptable.

Limitations

These formulas do not account for body frame size, muscle mass, age, or ethnicity. A muscular person may weigh more than the ideal weight yet be perfectly healthy. These calculations provide general guidelines, not strict targets. Always consult a healthcare professional for personalized advice.

Frequently Asked Questions

Q: Which ideal weight formula is most accurate?

A: No single formula is universally most accurate. The Devine formula is most widely used in clinical practice. The Robinson and Miller formulas tend to give slightly lower estimates. Consider the average of all four formulas as a reasonable target range.

Q: Should I aim for my ideal body weight?

A: Ideal body weight formulas are guidelines, not strict goals. Your optimal weight depends on many factors including muscle mass, bone density, and overall health. Focus on body composition, fitness level, and health markers rather than a single number.

Q: Why do the formulas give different results?

A: Each formula was developed using different study populations and methodologies. The variations reflect the inherent difficulty of defining one ideal weight for all individuals of a given height. The range between formulas typically spans 5-15 pounds.