Ideal Weight Calculator
Find your healthiest weight using proven formulas like Robinson, Devine, and BMI — all in one place.
🧭 What Is Ideal Weight?
Your ideal weight is a general target range where your body is likely to function best — with lower risk of chronic illness, better energy levels, and overall wellbeing. It’s not a “perfect number,” but a science-backed reference based on height, gender, and sometimes age or frame size.
Several formulas can estimate this, such as:
- Devine Formula: Classic method used in clinical settings.
- Robinson & Miller: More adjusted for modern body types.
- Hamwi Formula: Slightly older but still popular.
- Healthy BMI Range: The broadest recommendation for public use.
Each gives a slightly different number — so don’t panic if they don’t agree. Think of them as guiding tools, not strict limits.
📊 Case Study Examples
Example 1 – Female, 165 cm, 30 years old
- Robinson: 56.7 kg
- Devine: 59.0 kg
- Miller: 55.9 kg
- Hamwi: 59.9 kg
- BMI Range (18.5–24.9): 50.4–67.6 kg
👉 Her healthy range is about 50–67 kg, depending on the formula — which means 56–60 kg might be a balanced midpoint.
Example 2 – Male, 180 cm, 40 years old
- Robinson: 70.7 kg
- Devine: 72.6 kg
- Hamwi: 74.8 kg
- BMI Range: 60.0–81.0 kg
👉 In this case, most formulas point to 70–75 kg as optimal. If he's doing strength training, he may sit at the higher end due to lean muscle mass.
❓ Frequently Asked Questions (FAQs)
What’s the best formula for ideal weight?
There’s no single “best.” Devine is common for clinical use, while Robinson and Miller are more modern. Try comparing all to see your ideal range.
How accurate are these calculators?
They provide estimated ranges based on population data. They don’t consider body composition (muscle vs fat), so use them as a guideline — not a diagnosis.
Should I aim for the lowest number in the range?
Nope. The lower range reflects a healthy minimum, but being slightly above is often more realistic and sustainable. It’s about health, not thinness.
Is BMI outdated?
BMI is still widely used, but limited. It doesn’t distinguish between muscle and fat, so it might misclassify athletes or very fit individuals.
Can ideal weight change with age?
Yes. Older adults often carry a little more weight for resilience. Ideal weight is a flexible target, not a fixed rule.
Why are men and women’s weights calculated differently?
Because of differences in body composition — men generally have more lean mass, which affects baseline weight.