Ideal Weight Calculator
Estimate ideal body weight four ways from height.
How to use
- 1 Enter your height and choose centimetres or inches.
- 2 Select your sex so the right formula constants are used.
- 3 Read the four formula estimates and their average.
- 4 Compare against the BMI-based healthy weight range.
- 5 Copy the results if you want to keep them.
About Ideal Weight Calculator
The Ideal Weight Calculator estimates a target body weight from your height and sex using four classic clinical formulas that doctors and pharmacists have used for decades.
Devine (1974) was originally devised for medication dosing, Hamwi (1964) came from diabetes care, and Robinson (1983) and Miller (1983) refined the earlier work with updated coefficients.
Each formula starts from a base weight at five feet of height and adds a fixed amount for every inch above that, with separate constants for men and women.
Because the formulas disagree slightly, this tool shows all four side by side and an average, so you get a sensible range rather than a single false-precision number.
It also adds a healthy weight band derived from the body mass index, spanning a BMI of 18.5 to 24.9 for your height, which reflects how modern guidelines actually describe a healthy weight.
Enter your height in centimetres or inches, pick your sex, and the results update instantly.
Remember these are population estimates: they do not account for muscle mass, frame size, age or body composition, so treat them as a starting point for a conversation rather than a strict target.
Everything runs locally in your browser — nothing you enter is uploaded, logged or stored — and it keeps working offline once the page has loaded.
FAQ
Why do the four formulas give different numbers?
Each formula was derived from a different dataset and purpose, so their base weights and per-inch increments differ. Showing all four plus an average gives a realistic range instead of one over-precise figure.
Is ideal weight the same as a healthy weight?
Not exactly. The formulas estimate a single target, while a healthy weight is really a range. That is why we also show the BMI 18.5–24.9 band, which is how current guidelines describe healthy weight.
Should I use this for medical decisions?
No. These are general estimates that ignore muscle, frame and age. Use them as a rough guide and talk to a clinician for anything that affects your health or medication.