Quick Answer
Ideal body weight is commonly estimated using formulas like the Devine formula: for men, IBW(kg) = 50 + 2.3 × (height in inches over 5 feet); for women, IBW(kg) = 45.5 + 2.3 × (height in inches over 5 feet).
What Is Ideal Weight?
Ideal weight calculators estimate a healthy target body weight based primarily on height and sex, using formulas developed decades ago, originally for medical dosing purposes (calculating drug dosages based on an estimated 'ideal' rather than actual body weight). Several formulas exist, including Devine, Robinson, Miller, and Hamwi, each giving a slightly different result, since they were derived from different population datasets.
It's important to understand that 'ideal weight' from these formulas is a rough population-level estimate, not a personalized target. They don't account for individual differences in muscle mass, bone density, body frame size, or body composition, two people of the same height and sex can have very different healthy weights depending on their build.
Because of these limitations, most healthcare providers consider ideal weight formulas a starting reference point at best, often used alongside BMI, body fat percentage, and overall health assessment rather than as a standalone target to hit.
How to Use
- 1Enter your height and biological sex.
- 2The calculator computes your estimated ideal weight using one or more standard formulas (Devine, Robinson, Miller, Hamwi).
- 3Compare the range across formulas rather than fixating on a single number, since they can differ by several kilograms/pounds.
Formula
IBW(kg) = 50 + 2.3 × (height in inches − 60)IBW(kg) = 45.5 + 2.3 × (height in inches − 60)Example: Male, height 175 cm (≈ 68.9 inches)
- Height in inches ≈ 68.9
- IBW = 50 + 2.3 × (68.9 − 60)
- IBW = 50 + 2.3 × 8.9
- IBW ≈ 50 + 20.5
Tips & Things to Know
- Treat ideal weight formula results as a rough reference range, not a precise personal target, body frame size and muscle mass meaningfully affect what a genuinely healthy weight looks like for any individual.
- Comparing results across multiple formulas (Devine, Robinson, Hamwi) gives a more realistic range than relying on just one formula's single number.
- These formulas were originally developed for medical dosing calculations, not as fitness or aesthetic targets, keep that historical context in mind when interpreting results.
- For a more complete picture of healthy weight, consider these results alongside BMI and body fat percentage, and consult a healthcare provider for personalized guidance.