Ideal Weight Calculator
Calculate your ideal body weight based on height, gender, and frame size using multiple formulas (Hamwi, Devine, Robinson).
About this calculator
A quick ideal weight check from your height and sex. Enter both and the page shows the weight predicted by four classic formulas, Hamwi, Devine, Robinson and Miller, and the weight range for a healthy BMI of 18.5 to 24.9.
The result updates as you type. It is designed for a fast answer without extra fields, so there is no frame size or age option. For a South Asian perspective on BMI see the Ideal Weight Calculator.
How to use it
- Enter your Height in centimetres.
- Choose Male or Female.
- Read the four formulas and the healthy BMI range.
Formulas
For men over 5 feet: Devine = 50 + 2.3 × inches over 60, Robinson = 52 + 1.9 × inches, Miller = 56.2 + 1.41 × inches, Hamwi = 48 + 2.7 × inches. For women: 45.5 + 2.3, 49 + 1.7, 53.1 + 1.36 and 45.5 + 2.2. The BMI range is 18.5 to 24.9 × height(m)².
Worked example
Man, 175 cm
| Hamwi | 72.0 kg |
| Devine | 70.5 kg |
| Robinson | 68.9 kg |
| Miller | 68.7 kg |
| Healthy BMI range | 56.7 to 76.3 kg |
This tool gives general information, not medical advice. Talk to a doctor or dietitian before making changes to your diet, exercise or medication.
Tips and common mistakes
- Look at the overlap of formulas, about 69 to 72 kg here, and treat it as a rough target.
- The BMI range is wider because bodies differ.
- Body fat and waist size matter more than the number on the scale.
- Do not use these formulas for athletes, children or pregnancy.
- Set weight goals with a health professional if you are underweight or have a medical condition.
Frequently asked questions
What is the Devine formula?
50 kg plus 2.3 kg for each inch over 5 feet for men, 45.5 kg plus 2.3 for women.
Why do the formulas disagree?
They were developed from different data and for different purposes.
What is a healthy BMI?
18.5 to 24.9 for most adults.
Are these formulas accurate?
They are rough guides, not clinical targets.
Does it work in feet?
Convert feet and inches to centimetres first.
Should I aim for the exact number?
No, any weight within a healthy range with good fitness and habits is fine.