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Ideal weight calculator

Four classic formulas and a healthy BMI range, so you see a range rather than one number.

Runs entirely in your browser. Nothing you type is sent anywhere.

Height
cm

Some guidelines use lower thresholds for people from certain backgrounds. Choose the one that fits your family background, not where you live.

Healthy weight range (BMI)—

Devine (1974)
—
Robinson (1983)
—
Miller (1983)
—
Hamwi (1964)
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For general wellness only. These results are estimates from published formulas and guidelines, not a diagnosis or medical advice. They may not suit pregnancy, children, older adults, athletes or people with health conditions. Talk to a qualified health professional about your health. In an emergency, call your local emergency number.

How to use the ideal weight calculator

For adults 5 feet (152.4 cm) or taller, each formula adds a set amount per inch over 5 feet. Devine: 50 kg (men) or 45.5 kg (women) + 2.3 kg per inch. Robinson: 52 kg + 1.9 kg, or 49 kg + 1.7 kg. Miller: 56.2 kg + 1.41 kg, or 53.1 kg + 1.36 kg. Hamwi: 48 kg + 2.7 kg, or 45.5 kg + 2.2 kg. The healthy range is the weight that gives a healthy BMI under the standard for your family background, the same one the BMI calculator uses: 18.5 to 24.9 (WHO), 18.5 to 23.9 (China) or 18.5 to 22.9 (India, Japan, Korea, WHO Asia-Pacific and NICE’s lower thresholds).

  1. Choose units and your sex.
  2. Enter your height.
  3. Optionally choose your family background.
  4. Compare the formulas with the healthy BMI range.

Understanding your result

The BMI-based range is the broader guide: any weight inside it can be healthy. The four formulas each give one number and differ from each other by several kilograms, which shows how rough a single “ideal” weight is.

Sources

Sources checked on 9 October 2026. Formulas and thresholds are used as published; the wording on this page is our own.

Questions

Which formula is right?
None of them is “right” for everyone. They were developed decades ago from limited data and give a single number. The BMI range is a broader guide, and your waist size adds useful information.
Why don’t the formulas work under 5 feet?
They start from a base weight at 5 feet and add weight per inch, so they weren’t designed for shorter heights. The BMI range still works.
Should I aim for the lowest number?
No. Any weight within the healthy range can be healthy. Talk to a health professional before setting a weight goal.
Is this a diagnosis?
No. It compares your numbers with published ranges for general wellness. Only a qualified health professional can assess your health, taking your history and other tests into account.

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