Ideal Weight Calculator
Ideal weight calculators estimate healthy body weight ranges using multiple formulas. Robinson formula (1983): Men: 52kg + 1.9kg per inch over 5ft; Women: 49kg + 1.7kg per inch over 5ft. Devine formula: Men: 50kg + 2.3kg per inch over 5ft; Women: 45.5kg + 2.3kg per inch over 5ft. For 5'10" man: Robinson = 77kg (170 lbs), Devine = 73kg (161 lbs). BMI healthy range: 18.5-24.9. Individual factors (muscle mass, frame size, age) affect ideal weight.
Calculate your ideal body weight using four proven medical formulas: Devine, Robinson, Miller, and Hamwi. See the recommended weight range from all formulas, BMI-based healthy weight range, and a visual comparison. Supports metric and imperial units with frame size adjustment.
Settings
Measure wrist circumference: Small (<6.5"), Medium (6.5–7.5"), Large (>7.5") for men
How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- How is ideal body weight calculated?
- Ideal body weight (IBW) is estimated using medical formulas based on height and gender. The four most common formulas are Devine (1974), Robinson (1983), Miller (1983), and Hamwi (1964). Each uses a base weight for 5 feet of height, then adds a specific amount per additional inch. Results vary by formula, so using multiple formulas gives a recommended range rather than a single number.
- What is the Devine formula for ideal weight?
- The Devine formula (1974) is the most widely used in clinical medicine for drug dosing. For males: IBW = 50 kg + 2.3 kg per inch over 5 feet. For females: IBW = 45.5 kg + 2.3 kg per inch over 5 feet. For example, a 5'10" male would have an IBW of 73 kg (161 lbs).
- How does frame size affect ideal weight?
- Body frame size accounts for differences in bone structure. People with larger frames naturally weigh more due to heavier bones and more muscle mass. Frame size is typically determined by wrist circumference: for men, small (<6.5"), medium (6.5-7.5"), and large (>7.5"). A small frame reduces the ideal weight estimate by about 10%, while a large frame increases it by 10%.
- What is the difference between ideal weight and BMI?
- Ideal weight formulas give a specific target weight based on height and gender, while BMI (Body Mass Index) provides a healthy weight range based on the ratio of weight to height squared. BMI considers a range of 18.5-24.9 as healthy, which translates to a wider acceptable weight range. Ideal weight formulas are more prescriptive but do not account for age, muscle mass, or body composition.
- Which ideal weight formula is the most accurate?
- No single formula is universally "most accurate" since ideal weight depends on many individual factors including muscle mass, bone density, and body composition. The Devine formula is most commonly used in clinical settings, particularly for drug dosing. The Robinson formula is considered a good update to Devine. Using multiple formulas and looking at the range gives the most realistic target.
- Is ideal weight the same as healthy weight?
- Not exactly. Ideal weight formulas provide estimates based on population averages and are useful guidelines, but "healthy weight" is individual. Athletes and muscular people may weigh more than their calculated ideal weight while being very healthy. A better approach is to consider ideal weight alongside BMI, body fat percentage, waist circumference, and overall fitness level.