Results
Each row in the table shows an estimate from one formula in kg and lb, plus BMI-based ranges where available. This is general information only and not a medical diagnosis; please speak with a clinician for personal advice.
How this calculator works
This page estimates an ideal or target weight range for adults using four classic formulas plus a BMI-based target weight. It is a rough guide only and cannot decide what weight is healthy for you personally.
Quick how-to
- Choose your unit system (cm and kg, or ft/in and lb).
- Enter your height and sex. Optionally adjust the Hamwi frame size and the target BMI.
- Press Calculate to see each formula result, the BMI target weight, and the BMI 18.5–24.9 range. Use the shareable URL if you want to save or revisit the same settings.
Formulas shown
- Devine, Hamwi, Robinson and Miller: Start from a base weight at 5 ft (about 152 cm) and add or subtract a fixed amount for each inch (about 2.54 cm) above or below. Hamwi can also apply -10%, 0% or +10% to reflect smaller, medium or larger frame sizes.
- Target BMI weight: Your height in metres squared multiplied by the BMI you choose (22 by default).
- Healthy BMI corridor: The weight range that corresponds to BMI 18.5–24.9, shown so you can compare it with the classic formulas.
All calculations run only in your browser; your entries are not sent to our servers. If you are pregnant, under 18, over about 65, very muscular or have a medical condition, please treat these numbers as rough reference and talk with a health professional.
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FAQ
What does ideal weight mean in this calculator?
It is a rough target range of body weight based on height. The formulas give typical values for many adults, but they do not know your build, age, muscle mass or health history. Treat the result as a starting point for discussion, not as a rule you must reach.
Who is this tool designed for?
It is aimed at adults aged around 18 to 65 with no serious medical conditions. It is not designed for children, teenagers, pregnancy, very frail older adults or people under active medical treatment; in those cases you should ask a doctor or dietitian instead.
How do the Devine, Hamwi, Robinson and Miller formulas work?
Each formula starts from a base weight at 5 feet (about 152 cm) of height and then adds or subtracts a fixed amount for every inch (about 2.54 cm) above or below that. Devine and Robinson change more slowly, Hamwi assumes a frame size adjustment, and Miller tends to give the highest numbers. The calculator lets you view them side by side.
Which ideal weight formula is the most accurate?
No single formula is best for everyone. They were developed from older population data and make simplifying assumptions about body shape. If the formulas disagree, focus on the range they cover and how it compares with your BMI, and combine that with advice from a health professional.
How is the BMI target weight calculated?
The BMI target weight is your height in metres squared multiplied by the BMI value you choose. By default the calculator uses 22, and also shows the weight band that corresponds to the commonly used healthy BMI range of 18.5 to 24.9.
What BMI target should I choose?
Many adults fall somewhere in the BMI 18.5 to 24.9 band, but the best target depends on your medical history, age and goals. Using 22 gives a middle of the range number that many people use as a starting point. If you are unsure, ask a clinician rather than trying to push your BMI very low on your own.
Why does the tool limit height between 120 and 230 cm?
The formulas become less reliable at extreme heights, so the calculator focuses on a range that covers most adults. If your height is outside 120 to 230 cm you will see a warning, and you should be especially careful about interpreting the results.
Can I use this calculator for weight goals in children, teens or pregnancy?
No. Children, teenagers, pregnant people and some older adults need growth charts or specialist tools that take age, trimester and other factors into account. For those cases please rely on paediatric, obstetric or geriatric guidance instead of generic ideal weight formulas.
How are my data stored and shared?
Your entries are processed in your browser and are not sent to our servers. Recent runs can be kept in local storage on your device to fill the history list, and you can copy a shareable URL if you want to revisit the same settings later.
Why do values sometimes change slightly when I switch units?
When you switch between metric and US units, the calculator converts heights and weights using standard factors and then rounds them to practical decimal places. Small differences can appear because of rounding, but the underlying values are the same.
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