{
  "id": "adjusted-body-weight",
  "version": "bfed9c75e342",
  "status": "published",
  "name": "Adjusted Body Weight Calculator",
  "question": "What is my adjusted body weight?",
  "summary": "Calculates adjusted body weight: Devine ideal body weight plus 0.4 of the weight above it, in kilograms and pounds, from sex, height, and weight.",
  "category": "health",
  "subcategory": "clinical",
  "url": "https://www.acalculator.org/health/adjusted-body-weight-calculator",
  "markdown": "https://www.acalculator.org/health/adjusted-body-weight-calculator.md",
  "kind": "function",
  "method": "Ideal body weight (Devine) = 50 kg (men) or 45.5 kg (women) + 2.3 kg per inch over 5 ft. Adjusted body weight = ideal + 0.4 × (actual − ideal).",
  "assumptions": [
    "Heights of 5 ft (152.4 cm) or more: the Devine formula is defined from 5 ft.",
    "The factor 0.4 is the one Bauer and others (1983) found for aminoglycosides; some drugs use other factors.",
    "Each weight is rounded to 1 decimal and the percent to a whole number, halves up."
  ],
  "inputs": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "sex": {
        "title": "Sex",
        "description": "Sex at birth. The Devine formula has one line for men and one for women.",
        "type": "string",
        "enum": [
          "male",
          "female"
        ]
      },
      "height": {
        "title": "Height",
        "description": "Height without shoes, 5 ft (152.4 cm) or taller: the Devine formula starts at 5 ft.",
        "type": [
          "number",
          "string"
        ],
        "x-quantity": "length",
        "minimum": 1.524,
        "maximum": 2.5
      },
      "weight": {
        "title": "Weight",
        "description": "Actual body weight.",
        "type": [
          "number",
          "string"
        ],
        "x-quantity": "mass",
        "minimum": 20,
        "maximum": 350
      }
    }
  },
  "outputs": {
    "adjusted": {
      "label": "Adjusted body weight (kg)",
      "description": "Ideal body weight plus 0.4 of the difference between actual and ideal weight, in kilograms, to 1 decimal.",
      "format": "number"
    },
    "adjustedLb": {
      "label": "Adjusted body weight (lb)",
      "description": "The adjusted body weight in pounds, to 1 decimal.",
      "format": "number"
    },
    "ideal": {
      "label": "Ideal body weight (kg)",
      "description": "Devine ideal body weight in kilograms, to 1 decimal.",
      "format": "number"
    },
    "idealLb": {
      "label": "Ideal body weight (lb)",
      "description": "Devine ideal body weight in pounds, to 1 decimal.",
      "format": "number"
    },
    "percentIdeal": {
      "label": "Actual weight as % of ideal",
      "description": "Actual weight divided by ideal body weight, as a whole percent.",
      "format": "percent"
    }
  },
  "defaultAnswer": {
    "inputs": {
      "sex": "male",
      "height": 1.778,
      "weight": 113.3980925
    },
    "outputs": {
      "adjusted": 89.2,
      "adjustedLb": 196.6,
      "ideal": 73,
      "idealLb": 160.9,
      "percentIdeal": 155
    },
    "text": "The adjusted body weight is 89.2 kg (196.6 lb). The ideal body weight is 73 kg."
  },
  "examples": [
    {
      "given": {
        "sex": "male",
        "height": 1.778,
        "weight": 113.3980925
      },
      "expect": {
        "ideal": 73,
        "adjusted": 89.2,
        "adjustedLb": 196.6,
        "idealLb": 160.9,
        "percentIdeal": 155
      },
      "source": "Devine 1974: 50 + 2.3 × 10 = 73 kg; Bauer 1983: 73 + 0.4 × (113.398 − 73) = 89.159 kg = 196.56 lb (hand calculation in content.mdx)"
    },
    {
      "given": {
        "sex": "female",
        "height": 1.6256,
        "weight": 90.718474
      },
      "expect": {
        "ideal": 54.7,
        "adjusted": 69.1,
        "adjustedLb": 152.4,
        "percentIdeal": 166
      },
      "source": "Devine: 45.5 + 2.3 × 4 = 54.7 kg; 54.7 + 0.4 × (90.718 − 54.7) = 69.107 kg = 152.36 lb (hand calculation in content.mdx)"
    },
    {
      "given": {
        "sex": "male",
        "height": 1.8,
        "weight": 100
      },
      "expect": {
        "ideal": 75,
        "adjusted": 85,
        "percentIdeal": 133
      },
      "source": "180 cm = 70.866 in: 50 + 2.3 × 10.866 = 74.992 kg; 74.992 + 0.4 × 25.008 = 84.995 kg, shown as 85.0 (hand calculation in content.mdx)"
    },
    {
      "given": {
        "sex": "female",
        "height": 1.6,
        "weight": 50
      },
      "expect": {
        "ideal": 52.4,
        "adjusted": 51.4,
        "percentIdeal": 95
      },
      "source": "160 cm = 62.992 in: 45.5 + 2.3 × 2.992 = 52.382 kg; 52.382 + 0.4 × (50 − 52.382) = 51.429 kg (hand calculation)"
    }
  ],
  "sources": [
    "Devine BJ. Gentamicin therapy. Drug Intell Clin Pharm. 1974;8(11):650-655. https://doi.org/10.1177/106002807400801104",
    "Bauer LA, Edwards WA, Dellinger EP, Simonowitz DA. Influence of weight on aminoglycoside pharmacokinetics in normal weight and morbidly obese patients. Eur J Clin Pharmacol. 1983;24(5):643-647. https://doi.org/10.1007/BF00542215",
    "National Institute of Standards and Technology. NIST Special Publication 811, Appendix B (1 lb = 0.45359237 kg, 1 in = 2.54 cm). https://www.nist.gov/pml/special-publication-811"
  ],
  "related": [],
  "changelog": [
    {
      "date": "2026-09-30",
      "note": "Published after this site's editorial review against the cited sources (no clinician review); the page notices say so."
    }
  ]
}