Find your ideal body weight from four classic formulas plus a healthy BMI range.
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How is ideal body weight calculated from height?
By the Devine formula, men: 50 kg + 2.3 kg per inch over 5 ft; women: 45.5 kg + 2.3 kg per inch. Robinson, Miller and Hamwi use the same structure with different constants, alongside a healthy BMI range of 18.5–24.9. A man 178 cm (5 ft 10 in) tall is roughly 73 kg. These are population guides, not exact targets.
Understanding your result
These formulas are population guides; they don’t account for muscle mass, frame size or age, so treat them as a reference, not a target you must hit.
Formula and method
Devine (men): 50 kg + 2.3 kg per inch over 5 ft; (women) 45.5 kg + 2.3 kg per inch. Robinson, Miller and Hamwi use the same structure with different constants. Healthy range = BMI 18.5–24.9 × height².
Assumptions and limitations
These formulas are population-level guides, not medical advice, and results vary by individual. They do not account for muscle mass, frame size, age or body composition, so an athlete or a very lean person may sit outside the range while being healthy. Treat the figures as a reference and consult a professional for personal guidance.
Worked example
A man 178 cm (5 ft 10 in) tall has an ideal weight of roughly 73 kg by the Devine formula, within a healthy range of about 59–79 kg.
How to use this tool
- Choose your gender and unit system.
- Enter your height.
- Press Calculate to compare formulas and the healthy BMI range.
About the Ideal Weight Calculator
The Ideal Weight Calculator shows a target body weight for your height using four well-known clinical formulas, alongside the healthy weight range from the standard BMI scale.
Who should use this tool
Anyone curious about a reference body weight for their height, shown across four classic clinical formulas plus the healthy BMI range. Useful as a general orientation point rather than a fixed target, particularly for those who want to see how different formulas compare side by side.
Benefits
- Shows ideal weight across four well-known clinical formulas
- Includes the healthy weight range from the BMI scale
- Lets you compare different formulas at a glance
- Available any time, free, with no sign-in
Practical use cases
- Seeing a reference weight range for your height
- Comparing results from four classic formulas
- Placing your current weight in a healthy BMI range
- Orienting a conversation with a health professional
Frequently asked questions
Which ideal weight formula is best?
There’s no single best one. The healthy BMI range is the most widely used reference; the formulas give a useful midpoint.
Does muscle change my ideal weight?
Yes. Muscular people can be heavier than these estimates and still be healthy, which is why body fat percentage is also worth checking.
Why do the four formulas give different results?
Devine, Robinson, Miller and Hamwi share a similar structure but use different constants, so each produces a slightly different figure for the same height. None is definitively correct; they are historical population guides. Seeing them together gives a range rather than a single number, which better reflects their approximate nature.
Can a healthy person weigh outside the ideal range?
Yes. The formulas and BMI range ignore muscle mass, frame size and body composition, so people with high muscle or a larger frame may sit above the range while being healthy. The figures are a reference point, not a target you must hit; personal health is best assessed with a professional.