Ideal Weight Calculator
How much should you weigh for your height? This ideal weight calculator estimates a healthy weight range using four classic medical formulas — Devine, Robinson, Miller, and Hamwi — alongside the healthy BMI range. Enter your height and sex in metric or imperial units to see your range. Works worldwide.
Enter your height and sex. The calculator shows the healthy weight range for your height (from BMI) plus four classic ideal-body-weight estimates, so you get a realistic range rather than a single number.
* "Ideal body weight" is an estimate, not a target you must hit. These four formulas come from older population data and were originally developed for medical dosing, not fitness — they're based only on height and sex, and ignore muscle, build, body composition, age, and ethnicity. A muscular or athletic person may sit well above these numbers and be perfectly healthy. Treat the results as a rough range for context, alongside the healthy BMI range. For guidance about your own weight and health, please talk to a doctor or registered dietitian. This tool is for general information only and is not medical advice.
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What Is an Ideal Weight Calculator?
An ideal weight calculator estimates roughly how much you should weigh for your height. It uses four well-known medical formulas — Devine, Robinson, Miller, and Hamwi — that each give a single "ideal body weight" (IBW) figure from your height and sex, plus the healthy weight range that corresponds to a normal BMI. Because the formulas differ slightly, comparing them gives you a sensible range rather than one rigid number.
It's important to know what this is and isn't: ideal body weight is a useful reference point, but it's an approximation. It doesn't measure health directly, and a healthy weight for you depends on far more than height alone.
How Much Should I Weigh? (Quick Answer)
The most meaningful guide for most people is the healthy BMI range — the span of weights that put you in the normal BMI band (18.5–24.9) for your height. For example, someone 5'9" (175 cm) has a healthy range of roughly 56–76 kg (124–168 lb). The classic IBW formulas usually land somewhere inside that range. Enter your height above to see your own numbers.
The Four Ideal Weight Formulas
All four share the same structure: a base weight at 5 feet (60 inches), plus an increment for each additional inch. Results are in kilograms.
Robinson (1983) — Men: 52 + 1.9 × (in − 60) · Women: 49 + 1.7 × (in − 60)
Miller (1983) — Men: 56.2 + 1.41 × (in − 60) · Women: 53.1 + 1.36 × (in − 60)
Hamwi (1964) — Men: 48 + 2.7 × (in − 60) · Women: 45.5 + 2.2 × (in − 60)
Devine is the most cited in clinical practice. Robinson refined it with insurance-table data. Miller usually gives the highest figure. Hamwi, the oldest, is popular with dietitians and can be adjusted ±10% for body frame.
Ideal Weight by Height (Devine, Medium Frame)
| Height | Men (approx.) | Women (approx.) |
|---|---|---|
| 5'0" (152 cm) | 50 kg / 110 lb | 45.5 kg / 100 lb |
| 5'4" (163 cm) | 59 kg / 130 lb | 55 kg / 121 lb |
| 5'8" (173 cm) | 68 kg / 150 lb | 64 kg / 141 lb |
| 6'0" (183 cm) | 78 kg / 172 lb | 73 kg / 161 lb |
| 6'4" (193 cm) | 87 kg / 192 lb | 82 kg / 181 lb |
Why "Ideal Weight" Is Only a Guide
These formulas were originally created to help calculate medication doses, not to set fitness goals — and they're based only on height and sex. They don't account for muscle mass, bone density, body frame, age, or ethnicity. A muscular athlete can weigh well above their "ideal" figure while being extremely fit, and two people of the same height can both be healthy at quite different weights. That's why it's best to treat the result as one data point among several, rather than a goal to chase. If you're thinking about changing your weight, a doctor or registered dietitian can give advice that fits your whole picture.
Ideal Weight vs BMI vs Body Fat
Each tells you something different. Ideal weight gives a target figure from height and sex. BMI classifies your current weight relative to height into categories. Body fat percentage looks at composition — how much of you is fat versus lean tissue — which is often more informative than weight alone. Used together, they give a fuller picture than any single number.