What does the Ideal Weight Calculator do?

Calculate your ideal weight using Robinson, Miller, Devine and Hamwi formulas. See your healthy BMI range. All calculations are performed in your browser using official UK rates and thresholds.

Is this medical advice?

No. This calculator is for informational purposes only and does not constitute medical advice. Always consult your GP or an appropriate healthcare professional for medical guidance.

Are the reference values from the NHS?

Where applicable, this calculator uses reference values and guidelines from the NHS and other UK health authorities. Individual needs may vary based on personal health circumstances.

Ideal Weight Calculator

Calculate your ideal weight using Robinson, Miller, Devine and Hamwi formulas. See your healthy BMI range.

Last updated: April 2026 · Source: NHS — BMI healthy weight calculator

Height (cm)

Average Ideal Weight

70.0 kg

Healthy BMI range: 56.7 – 76.3 kg

Robinson

68.9 kg

Miller

68.7 kg

Devine

70.5 kg

Hamwi

72.0 kg

Disclaimer

This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.

How It Works

This calculator estimates your ideal weight range using several established formulas. The BMI method defines a healthy range as a BMI between 18.5 and 24.9. The Devine formula (1974) and Robinson formula (1983) each use height to produce a single ideal weight figure, originally developed for drug-dosing calculations.

For a given height, the calculator shows the healthy BMI weight range alongside the Devine and Robinson estimates. No single number is definitive — body composition, frame size and ethnicity all influence what is healthy for you. The NHS uses BMI as a screening tool but acknowledges its limitations for muscular builds.

Enter your height and sex to see all three estimates. The results give a reasonable target range rather than a single figure. If you are concerned about your weight, your GP can take body composition, waist circumference and medical history into account for a fuller assessment.

Example: Male, 178 cm (5'10")

BMI healthy range (18.5–24.9): 58.6–78.9 kg
Devine formula: 73.5 kg
Robinson formula: 72.6 kg
Suggested target range: 68–79 kg

Source: NHS — BMI healthy weight calculator

Frequently Asked Questions

What does the Ideal Weight Calculator do?: Calculate your ideal weight using Robinson, Miller, Devine and Hamwi formulas. See your healthy BMI range. All calculations are performed in your browser using official UK rates and thresholds.
Is this medical advice?: No. This calculator is for informational purposes only and does not constitute medical advice. Always consult your GP or an appropriate healthcare professional for medical guidance.
Are the reference values from the NHS?: Where applicable, this calculator uses reference values and guidelines from the NHS and other UK health authorities. Individual needs may vary based on personal health circumstances.