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Adjusted Ideal Body Weight Calculator

Enter your height, weight and sex to estimate adjusted body weight.

How it is calculated

Height is entered in centimetres and actual weight in kilograms. The tool converts height to inches, h = cm ÷ 2.54, then applies the Devine ideal weight: IBW = 50 + 2.3 × (h − 60) kg for male, 45.5 + 2.3 × (h − 60) kg for female. The adjusted weight is AdjBW = IBW + 0.4 × (actual − IBW). All results are shown with one decimal. The correction is always applied, including when actual weight is below IBW (then AdjBW lands between the two), and the tool does not check whether the patient is actually above a clinical threshold such as 120% of IBW. Very short heights where IBW would be zero or negative give no result. For learning only, not for dosing.

Worked example

Male, 175 cm, actual weight 95 kg. Height in inches: 175 ÷ 2.54 = 68.90. IBW = 50 + 2.3 × (68.90 − 60) = 50 + 20.47 = 70.47 kg, shown as 70.5 kg. Difference from actual: 95 − 70.47 = 24.53 kg. Forty percent of that is 9.81 kg. AdjBW = 70.47 + 9.81 = 80.28, shown as 80.3 kg. The same height and weight with sex set to female gives an IBW of 66.0 kg and an AdjBW of 77.6 kg.

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Common mistakes

  • Entering height in inches or feet: the height field is in centimetres, so 69 would be read as a 69 cm person and return no result.
  • Entering weight in pounds: the actual weight field is kilograms.
  • Leaving sex on the default: the male formula is used unless female is chosen, which shifts IBW by 4.5 kg and AdjBW by 2.7 kg.
  • Using AdjBW for someone near or below ideal weight: the tool still applies the 0.4 factor and gives a value between IBW and actual weight, which has no clinical meaning there.
  • Confusing adjusted weight with ideal weight or a healthy target: the two are different numbers and the tool is not a dosing instruction.

Sources

About this calculator

Adjusted body weight (AdjBW) is a clinical dosing weight used when a patient’s actual weight is significantly above their ideal weight, since dosing purely on actual weight can overestimate the dose for drugs that distribute mainly into lean tissue. It starts from the Devine formula for ideal body weight — IBW (kg) = 50 + 2.3 × (height in inches − 60) for men and 45.5 + 2.3 × (height in inches − 60) for women — and then applies a correction: AdjBW = IBW + 0.4 × (actual weight − IBW).

The 0.4 correction factor reflects the observation that excess adipose tissue is not metabolically inert but also isn’t as pharmacologically active as lean mass, so adjusted body weight sits between the two extremes of using actual weight or ideal weight alone. Pharmacists, dietitians and clinicians use AdjBW for dosing certain medications and nutritional calculations in patients with obesity; enter height, weight and sex to estimate it. Not medical advice.

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Comments (1)

  • Editorial team

    This is a dosing and nutrition reference, not a verdict on anyone's weight. For 175 cm and a male with 90 kg the tool shows an ideal weight of 70.5 kg and an adjusted weight of 78.3 kg. For someone at 60 kg it still applies the correction, giving 66.3 kg, so check whether your protocol uses it only above a threshold. Always follow your clinician's or pharmacist's guidance. Which formula does your protocol call for?

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