Which ideal weight formula is most accurate?

There isn’t a single most accurate formula. Devine, Robinson, Miller, Hamwi, and Lemmens provide similar estimates but vary slightly due to differing assumptions and data sources.

Why do formulas give different results?

Each formula was created from a different dataset and uses unique assumptions about height, sex, and frame size, so the results are expected to differ slightly.

Is ideal weight the same as healthy weight?

No. Ideal body weight is a theoretical reference, while healthy weight also depends on body fat percentage, waist-to-height ratio, and overall fitness level.

How should I set a target weight?

Set a realistic range for your goals and body type. Use TDEE and Macros calculators to plan gradual, sustainable progress.

How often should I recheck my IBW?

Reassess when your goals or body composition change. Track progress with waist circumference and body fat percentage.

Ideal Weight Calculator

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IBW Formula Comparison

Each formula estimates ideal body weight (IBW) slightly differently based on height and sex. The table below shows sample results for an adult male and female at common heights.

Height	Devine	Robinson	Miller	Hamwi	Lemmens
160 cm (5'3")	54.0 kg	53.0 kg	52.0 kg	50.0 kg	56.3 kg
170 cm (5'7")	63.0 kg	62.0 kg	61.0 kg	59.0 kg	63.6 kg
180 cm (5'11")	72.0 kg	71.0 kg	70.0 kg	68.0 kg	71.3 kg
190 cm (6'3")	81.0 kg	80.0 kg	79.0 kg	77.0 kg	79.2 kg

Values are approximate and assume average frame size. For more personalized results, combine IBW with BMI, Body Fat %, and TDEE.

About Ideal Weight (IBW) Calculator

The Ideal Weight Calculator estimates ideal body weight (IBW) from your height and sex using well-known formulas: Devine, Robinson, Miller, Hamwi, and Lemmens (BMI = 22). The results show reference ranges—use them together with BMI, body fat percentage, and overall health markers.

How to use this Ideal Weight Calculator

Select your sex and enter your height (cm, in, or ft+in).
Click Calculate to get IBW values from each formula in kilograms and pounds.
Compare the results to identify a realistic and sustainable target range.

Notes and context

Muscle mass: Individuals with higher lean mass may be healthy above the listed IBW range.
Clinical use: IBW is often used in medical dosing or nutritional planning, not as a fitness target.
Lemmens formula: Calculates IBW as BMI 22 × height² and does not depend on sex.

Disclaimer: IBW is a reference value, not a diagnostic result. Always interpret it alongside waist measures, body fat %, and professional advice.

FAQ

Which ideal weight formula is most accurate?
There isn’t a single “best” one. Devine, Robinson, Miller, Hamwi, and Lemmens formulas use slightly different assumptions, so results vary within a reasonable range.
Why do formulas give different results?
Each was derived from different populations and frame-size assumptions, which leads to small differences in estimated weights.
Is ideal weight the same as healthy weight?
Not exactly. “Ideal” is theoretical, while healthy weight depends on body composition, waist size, fitness, and clinical markers.
How should I set a target weight?
Choose a realistic range for your build and goals. Plan gradual changes using the TDEE and Macros calculators.
How often should I recheck my IBW?
Recalculate when your goals or body composition change, and track progress with body fat % and waist circumference.

Disclaimer

The tools provided on this site are intended for educational and informational purposes only and are not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified health provider with any questions you may have about a medical condition. If you think you may have a medical emergency, call your local emergency number immediately.