Ideal Weight Calculator

Find your ideal body weight range using multiple established formulas including Devine, Robinson, and Hamwi.

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1. Select your sex (male or female) as each formula differs by sex. 2. Enter your height in centimeters or feet and inches. 3. View ideal weight estimates from the Devine, Robinson, Miller, and Hamwi formulas. 4. Compare the range across all four formulas to find a realistic target. 5. Consider your body frame size and adjust the target by plus or minus 10% accordingly.

About This Tool

Knowing your ideal weight range can provide a helpful benchmark for setting realistic health and fitness goals. Our Ideal Weight Calculator uses multiple well-known formulas - Devine, Robinson, Miller, and Hamwi - to give you a range of estimates rather than a single number, because no single formula works perfectly for everyone.

Each formula was developed from different population studies and may suit different body types. The Devine formula is widely used in clinical settings for drug dosing. The Robinson and Miller formulas tend to give slightly different results for taller and shorter individuals. By showing all four, you can see the range and find a target that feels realistic for your frame.

Ideal weight formulas have limitations. They do not account for muscle mass, bone density, body frame size, or ethnic differences in body composition. A muscular person may weigh more than these formulas suggest and still be perfectly healthy. Use the results as a general guideline and consult a healthcare professional for personalized advice.

Formula / How It Works

Devine: Men = 50 + 2.3 x (height in inches - 60) kg, Women = 45.5 + 2.3 x (height in inches - 60) kg. Robinson: Men = 52 + 1.9 x (height in inches - 60) kg, Women = 49 + 1.7 x (height in inches - 60) kg.

Frequently Asked Questions

No single formula is universally most accurate. The Devine formula is most commonly used in medical settings. Looking at the range from all four formulas gives a more realistic target. Your ideal weight also depends on body composition, frame size, and personal health factors.
BMI categorizes your current weight status relative to your height. Ideal weight formulas calculate a specific target weight for your height and sex. They are related concepts but approach the question from different angles. Both have limitations for muscular individuals.
Yes. People with larger bone structures naturally weigh more than those with smaller frames at the same height. Most ideal weight formulas do not account for frame size, so add or subtract about 10% based on whether you have a large or small frame.
The Devine formula calculates ideal body weight as: Men = 50 kg + 2.3 kg per inch over 5 feet. Women = 45.5 kg + 2.3 kg per inch over 5 feet. It was originally developed in 1974 for calculating medication dosages.
No. Ideal weight formulas provide estimates, not exact targets. A range of plus or minus 10% around the calculated value is reasonable. Focus on overall health markers like energy, blood pressure, and body composition rather than hitting an exact number on the scale.

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