How this calculator works
You get two kinds of results.
1. Healthy weight range. The weights that give a BMI between 18.5 and 24.9 at your height. This is the range the World Health Organization uses for healthy adults.
2. Classic ideal body weight formulas. Each one starts from a base weight at 5 feet (152.4 cm) and adds a fixed amount for every inch above that:
| Formula | Men | Women |
|---|---|---|
| Robinson (1983) | 52 kg + 1.9 kg/inch | 49 kg + 1.7 kg/inch |
| Miller (1983) | 56.2 kg + 1.41 kg/inch | 53.1 kg + 1.36 kg/inch |
| Devine (1974) | 50 kg + 2.3 kg/inch | 45.5 kg + 2.3 kg/inch |
| Hamwi (1964) | 48 kg + 2.7 kg/inch | 45.5 kg + 2.2 kg/inch |
How to read your result
Think of the formulas as reference points inside your healthy range rather than one magic number. If all four cluster around a similar weight, that’s a reasonable target for someone with average muscle mass.
Your body type matters. People with a larger frame or more muscle often feel and perform best toward the top of the range. Smaller-framed people often sit lower.
Setting a goal you can keep
- Pick a range, not a number. A 3–4 kg band is easier to maintain than a single target.
- Look at body fat, not just weight. Check yours with the body fat calculator.
- Plan the time it takes. The transformation timeline turns your goal into a realistic date.
- Focus on habits. Daily steps, protein, sleep and strength training shape your weight more than any formula.
Limitations
Ideal weight formulas don’t account for muscle, bone structure, age or ethnicity. They’re a starting point for adults, not medical advice. If you’re unsure what’s healthy for you, ask your doctor or one of our coaches.
