Ideal Body Weight Calculator
Enter your height and gender to estimate your ideal body weight (IBW) using the Devine formula, a standard clinical reference.
Not medical advice General estimate only. Ideal weight varies with body composition, muscle mass, age and health conditions. Consult a healthcare professional for personalized advice.
Ideal Body Weight Calculator
Estimate ideal body weight from height
Devine formula: Men = 50 kg + 2.3 kg per inch over 5 ft. Women = 45.5 kg + 2.3 kg per inch over 5 ft.
⚠️ Double-check important results. This is an educational estimate, not professional advice — and where it uses a rate, bracket or fee, those change over time. Verify anything you'll rely on, especially in legal, financial, tax or medical matters, and read our full disclaimer. Think a result is wrong? Tell us so we can fix it.
Devine Formula
The Devine formula (1974) is a standard clinical reference for ideal body weight:
Men: IBW = 50 kg + 2.3 kg × (height in inches − 60) Women: IBW = 45.5 kg + 2.3 kg × (height in inches − 60)
**Limitations**: - Based on height only — doesn't account for muscle mass, frame size or body composition - Athletes with high muscle may weigh more than IBW and still be healthy - Doesn't apply well to people under 5 feet or with atypical builds - Use BMI and body fat percentage alongside IBW for a fuller picture
- Devine formula (1974), clinical reference
- Different baseline for men (50 kg) vs women (45.5 kg)
- +2.3 kg per inch over 5 feet
- Height-only estimate — use with BMI and body fat
Worked Example
Example: Male, 5'9" (69 inches).
- IBW = 50 + 2.3 × (69 − 60) = 50 + 2.3 × 9 = 50 + 20.7 = 70.7 kg - 70.7 kg ≈ 156 lb
Example: Female, 5'4" (64 inches). - IBW = 45.5 + 2.3 × (64 − 60) = 45.5 + 9.2 = 54.7 kg - 54.7 kg ≈ 121 lb
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Open calculator →Frequently Asked Questions
Is ideal body weight the same as a healthy weight?
Closely related but not identical. IBW is a single number from a formula; a healthy weight is usually a range (BMI 18.5–24.9). Use both as references, not strict targets.
Why do men and women have different formulas?
Men typically have more muscle mass and bone density than women at the same height, so the Devine formula uses a higher baseline for men.
Looking for a different calculator?
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