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Ideal weight calculator
Ideal body weight formulas and the healthy BMI range for your height.
Quick answer
Enter your sex and height. For a man 175 cm tall the Devine formula gives about 70.5 kg, inside the healthy BMI range of 56.7 to 76.3 kg.
Devine formula
70.5
- Robinson formula
- 68.9
- Healthy BMI range (18.5 to 24.9)
- 56.7 to 76.3 kg
Formulas were made for general guidance. Your frame, muscle and health matter more. A general estimate, not medical advice. Talk to a doctor or dietitian about your own health.
How it works
Several old formulas estimate an ideal weight from height. They agree roughly but not exactly.
The BMI-based range is the best guide: any weight inside it counts as normal for your height.
Treat all of these as a starting point and talk to a doctor if you are unsure.
The formula
- Devine: men 50 kg + 2.3 kg for each inch over 5 feet, women 45.5 kg + 2.3 kg per inch
- Robinson: men 52 kg + 1.9 kg per inch, women 49 kg + 1.7 kg per inch
- Healthy range: 18.5 ร hยฒ to 24.9 ร hยฒ, h in metres
A worked example
Man, 175 cm = 68.9 inches, which is 8.9 over 5 feet: Devine = 50 + 2.3 ร 8.9 = 70.5 kg, Robinson = 52 + 1.9 ร 8.9 = 68.9 kg.
Common questions
Which formula is most accurate?
None is exact. The healthy BMI range is a more useful target than a single number.
Does age change ideal weight?
These formulas ignore age. Older adults may be healthier at a slightly higher weight.
What if I am under 5 feet?
The formulas assume a height above 5 feet (152 cm), so use the BMI range instead.
Does muscle matter?
Yes. Muscle weighs more than fat, so a fit person can be heavier than the formula and still be healthy.