Estimate ideal body weight from height and sex with the Devine, Miller and Robinson formulas, their average, and the BMI 18.5-24.9 weight range.
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Health & Wellness Disclaimer
Calculations and estimates provided by this tool are for informational and educational purposes only. They are not intended as medical advice, diagnosis, or treatment. Always consult a qualified physician or healthcare professional regarding any health condition or medical decision.
A single 'ideal weight' is a simplification: muscle mass, bone structure and age all affect what is healthy for a given person, and none of these formulas measure them. For a 5 ft 8 in (68 in) man the three formulas give 67.2 to 68.4 kg, while the BMI range is 55.2 to 74.3 kg - seeing both shows how wide a sensible target really is.
Different medical formulas estimate ideal body weight (IBW) differently, so this calculator shows three of them side by side - Devine, Miller and Robinson - plus their average and the weight range that gives a BMI of 18.5 to 24.9 at your height. Enter your height in centimetres or inches and choose male or female; results are in kilograms.
Input your height in centimetres or inches.
Choose male or female for gender-specific formulas.
See ideal weight from the Devine, Miller and Robinson formulas and their average, in kg.
See your healthy weight range with a visual BMI context.
See a reference weight before setting a fitness goal, compare your current weight with the IBW formulas and the BMI range for your height, understand why different calculators give different answers, or get the IBW figure some medication and nutrition guides refer to.
The most common follow-up is whether ideal body weight is the same as a healthy BMI weight. They overlap but are not identical - the IBW formulas came from clinical drug-dosing work, while the BMI range is a population-level health indicator.
It depends on the formula. For a 5 ft 8 in (68 in, about 172.7 cm) man, this calculator gives Devine 68.4 kg, Miller 67.5 kg and Robinson 67.2 kg - an average of 67.7 kg. For a woman of the same height: Devine 63.9 kg, Miller 64.0 kg, Robinson 62.6 kg (average 63.5 kg). The BMI 18.5-24.9 range at that height is 55.2-74.3 kg.
Ideal body weight (IBW) is a clinical estimate developed for medical dosing purposes - it is a formula, not a health certification. Healthy weight is defined by BMI 18.5–24.9, which is a population-level statistical association with lower disease risk. The two concepts overlap but are not identical. You can be healthy above your IBW if you have higher-than-average muscle mass, and unhealthy at IBW if body fat percentage is high.
Different formulas were developed by different researchers with different assumptions and populations. Devine (1974) came from drug-dosing work, and Robinson and Miller (both 1983) re-fitted it to newer height and weight data. This calculator shows those three; the older Hamwi formula is not included. None were designed to define the 'best' weight for health - they are clinical tools repurposed as reference points.
Only roughly. All three formulas start from a base weight at 5 feet (60 inches) and add weight per inch above that; below 5 feet this calculator adds nothing, so everyone under 5 feet gets the 5-foot base values (for a man: Devine 50.0 kg, Miller 56.2 kg, Robinson 52.0 kg). The BMI range is still calculated from your actual height.
Yes significantly. IBW formulas assume average body composition. A person with high muscle mass will weigh more than their IBW suggests without being overweight by any health measure - muscle is denser than fat. Athletes, powerlifters, and people who strength train regularly often exceed IBW by 10–20% while having low body fat percentages.
Using BMI 18.5–24.9 as the healthy range: For 160cm (5'3"): 47–64kg. For 170cm (5'7"): 53–72kg. For 180cm (5'11"): 60–81kg. For 190cm (6'3"): 67–90kg. These are ranges, not targets - where in the range is appropriate depends on body composition, age, and health status.
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