Ideal Weight Calculator
Estimate your ideal body weight by height and sex using four established medical formulas.
Estimate your ideal body weight
The Ideal Weight Calculator estimates a healthy target weight based on your height and sex, using four established medical formulas — Devine, Robinson, Miller, and Hamwi — and shows their average. Enter your height and see the results instantly, in both kilograms and pounds. It runs entirely in your browser.
What is "ideal" weight?
Ideal body weight (IBW) formulas were originally developed to help with medication dosing and clinical assessment. They give a reference weight for a given height and sex. Because several formulas exist and each gives a slightly different number, showing a range — and the average — is more honest than pretending there is one perfect figure.
The formulas compared
| Formula | Notes |
|---|---|
| Devine (1974) | The most widely used, originally for drug dosing |
| Robinson (1983) | A refinement of Devine, slightly lower |
| Miller (1983) | Another Devine refinement |
| Hamwi (1964) | A classic quick clinical estimate |
How to use it
- Select your sex.
- Enter your height in centimeters.
- Read the average ideal weight and each formula's estimate.
Important context
These formulas use only height and sex, so they cannot account for your build, muscle mass, age, or body composition. A muscular athlete may healthily weigh more than the "ideal," while frame size also matters. Treat the result as a general reference point, not a strict goal, and consider pairing it with BMI and body-fat measurements for a fuller picture. For medical guidance, consult a healthcare professional.
Healthy weight is a range
- Your healthy weight is a range, not a single number.
- Body composition matters more than the scale.
- Habits — diet, activity, sleep — drive long-term health.
- Trends over months tell you more than any one reading.
Private and free
All calculations run in your browser. Nothing is uploaded, and the tool is completely free with no sign-up.
Frequently asked questions
Which ideal weight formula is best?
There is no single best one. Devine is the most widely used; this tool shows several and their average for a balanced view.
Do these formulas account for muscle?
No. They use only height and sex, so muscular or large-framed people may healthily weigh more than the estimate.
Should I treat this as a strict goal?
No. Use it as a general reference. Healthy weight is a range and depends on body composition and individual factors.
Is it free?
Yes, completely free with no sign-up, running entirely in your browser.