Health & Body Composition
Ideal Weight Calculator
Find your healthy weight range from BMI 18.5–24.9, plus the classic Devine, Robinson, Miller and Hamwi formula estimates used in clinical practice.
Ideal body weight is the weight range statistically associated with the lowest health risk for your height and sex, typically a BMI of 18.5–24.9. Formulas such as Devine and Robinson are used for clinical dosing and estimates. Results are screening estimates, not diagnoses — confirm with a clinician before acting on them.
Healthiest range: BMI 18.5–24.9.
Four clinical formulas compared.
Used in dosing and clinical estimates.
Calculate Your Ideal Weight
Your Healthy Weight Range
What Is Ideal Weight?
Ideal body weight isn't one number, it's a range associated with the lowest health risk. The most evidence-based definition is the weight span that keeps BMI between 18.5 and 24.9.
Clinical formulas such as Devine, Robinson, Miller, and Hamwi estimate a single ideal weight and are used in practice mainly for medication dosing. This calculator shows the healthy range plus all four formula estimates so you can compare.
How It Is Calculated
Healthy range: BMI 18.5–24.9 → weight = BMI × height²
Devine: 50 + 2.3 kg per inch over 5 ft (men) · 45.5 + 2.3 (women)
Example: Example: 175 cm man → healthy range 56.7–76.3 kg; Devine ideal ≈ 70.3 kg
Ideal weight formulas compared (for reference)
| Formula | Basis | Typical use |
|---|---|---|
| Devine | 50 kg + 2.3 kg/in over 5 ft (M) | Medication dosing |
| Robinson | 52 kg + 1.9 kg/in over 5 ft (M) | Clinical reference |
| Miller | 56.2 kg + 1.41 kg/in over 5 ft (M) | Clinical reference |
| Hamwi | 48 kg + 2.7 kg/in over 5 ft (M) | Nutrition reference |
| BMI range | 18.5–24.9 × height² | Health guideline (gold standard) |
Limitations
- All single-number formulas disagree with each other, treat them as estimates, not targets.
- The BMI healthy range doesn't account for frame size or muscle mass.
- Healthy weight shifts slightly with age; older adults may do better slightly higher in the range.
- For athletes, body fat percentage matters more than ideal weight.
Sources & Review
References used for this calculator’s formulas and thresholds:
Ideal Weight FAQ
What is my ideal weight for my height?
A healthy range for most adults is the weight span that keeps BMI between 18.5 and 24.9. For a 175 cm adult that's about 57–76 kg.
Which ideal weight formula is most accurate?
The BMI-based range is the best-evidenced target. Single-number formulas like Devine or Robinson disagree by several kilograms and are mainly used for drug dosing.
Why do ideal weight formulas differ?
Each formula was derived from different populations and assumptions about body build, which is why they produce different single numbers, a range is more realistic.
Does muscle mass change my ideal weight?
Yes. Muscular people can weigh more than formula estimates while carrying low body fat. Check body fat percentage for a fuller picture.
A note before you begin: this tool offers educational estimates only. It cannot replace advice from your doctor or another qualified professional.