{
  "id": "body-surface-area-calculator",
  "version": "2.0.0",
  "name": "Body Surface Area Calculator",
  "shortName": "BSA",
  "description": "Calculate body surface area with Mosteller, Du Bois, Haycock, Gehan–George, Boyd, and Schlich formulas.",
  "category": "Health & Fitness",
  "categorySlug": "health-fitness",
  "keywords": [
    "body surface area",
    "BSA",
    "Mosteller",
    "Du Bois",
    "Haycock",
    "Schlich"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "new",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/body-surface-area-calculator.json",
    "qualifiedReview": "pending",
    "qualifiedReviewer": null,
    "qualifiedReviewDate": null,
    "formulaVersion": "2.0.0",
    "referenceCoverage": "references-listed",
    "releaseTestScope": "Catalog and regression checks are not a professional formula audit; consult release evidence.",
    "historicalMetadataDate": "2026-08-25",
    "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
  },
  "notice": "BSA is an estimate. Clinical dosing or treatment decisions require professional verification.",
  "urls": {
    "page": "/calculator/body-surface-area-calculator/",
    "definition": "/calculator/body-surface-area-calculator/definition.json",
    "schema": "/calculator/body-surface-area-calculator/schema.json",
    "llms": "/calculator/body-surface-area-calculator/llms.txt",
    "legacyDefinition": "/calculator/body-surface-area-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/body-surface-area-calculator/?unitSystem=metric&sex=male&weightKg=70&heightCm=175",
  "queryParameters": {
    "unitSystem": {
      "label": "Units",
      "type": "select",
      "required": true,
      "default": "metric"
    },
    "sex": {
      "label": "Sex used by equation",
      "type": "select",
      "required": true,
      "default": "male"
    },
    "weightKg": {
      "label": "Weight",
      "type": "number",
      "required": true,
      "default": 70,
      "showWhen": {
        "field": "unitSystem",
        "equals": "metric"
      }
    },
    "heightCm": {
      "label": "Height",
      "type": "number",
      "required": true,
      "default": 175,
      "showWhen": {
        "field": "unitSystem",
        "equals": "metric"
      }
    },
    "weightLb": {
      "label": "Weight",
      "type": "number",
      "required": true,
      "default": 154,
      "showWhen": {
        "field": "unitSystem",
        "equals": "imperial"
      }
    },
    "feet": {
      "label": "Height feet",
      "type": "number",
      "required": true,
      "default": 5,
      "showWhen": {
        "field": "unitSystem",
        "equals": "imperial"
      }
    },
    "inches": {
      "label": "Height inches",
      "type": "number",
      "required": true,
      "default": 9,
      "showWhen": {
        "field": "unitSystem",
        "equals": "imperial"
      }
    }
  },
  "inputs": [
    {
      "id": "unitSystem",
      "label": "Units",
      "type": "select",
      "required": true,
      "defaultValue": "metric",
      "options": [
        {
          "label": "Metric",
          "value": "metric"
        },
        {
          "label": "Imperial",
          "value": "imperial"
        }
      ],
      "width": "full"
    },
    {
      "id": "sex",
      "label": "Sex used by equation",
      "type": "select",
      "required": true,
      "defaultValue": "male",
      "options": [
        {
          "label": "Male",
          "value": "male"
        },
        {
          "label": "Female",
          "value": "female"
        }
      ],
      "width": "half"
    },
    {
      "id": "weightKg",
      "label": "Weight",
      "type": "number",
      "required": true,
      "defaultValue": 70,
      "min": 1,
      "max": 500,
      "step": 0.1,
      "suffix": "kg",
      "showWhen": {
        "field": "unitSystem",
        "equals": "metric"
      },
      "width": "half"
    },
    {
      "id": "heightCm",
      "label": "Height",
      "type": "number",
      "required": true,
      "defaultValue": 175,
      "min": 50,
      "max": 300,
      "step": 0.1,
      "suffix": "cm",
      "showWhen": {
        "field": "unitSystem",
        "equals": "metric"
      },
      "width": "half"
    },
    {
      "id": "weightLb",
      "label": "Weight",
      "type": "number",
      "required": true,
      "defaultValue": 154,
      "min": 2,
      "max": 1100,
      "step": 0.1,
      "suffix": "lb",
      "showWhen": {
        "field": "unitSystem",
        "equals": "imperial"
      },
      "width": "full"
    },
    {
      "id": "feet",
      "label": "Height feet",
      "type": "number",
      "required": true,
      "defaultValue": 5,
      "min": 1,
      "max": 9,
      "step": 1,
      "suffix": "ft",
      "showWhen": {
        "field": "unitSystem",
        "equals": "imperial"
      },
      "width": "half"
    },
    {
      "id": "inches",
      "label": "Height inches",
      "type": "number",
      "required": true,
      "defaultValue": 9,
      "min": 0,
      "max": 11.9,
      "step": 0.1,
      "suffix": "in",
      "showWhen": {
        "field": "unitSystem",
        "equals": "imperial"
      },
      "width": "half"
    }
  ],
  "outputs": [
    {
      "id": "mosteller",
      "label": "Mosteller BSA",
      "format": "number",
      "primary": true,
      "digits": 4,
      "suffix": " m²"
    },
    {
      "id": "duBois",
      "label": "Du Bois BSA",
      "format": "number",
      "digits": 4,
      "suffix": " m²"
    },
    {
      "id": "haycock",
      "label": "Haycock BSA",
      "format": "number",
      "digits": 4,
      "suffix": " m²"
    },
    {
      "id": "gehanGeorge",
      "label": "Gehan–George BSA",
      "format": "number",
      "digits": 4,
      "suffix": " m²"
    },
    {
      "id": "boyd",
      "label": "Boyd BSA",
      "format": "number",
      "digits": 4,
      "suffix": " m²"
    },
    {
      "id": "schlich",
      "label": "Schlich BSA",
      "format": "number",
      "digits": 4,
      "suffix": " m²"
    },
    {
      "id": "average",
      "label": "Formula average",
      "format": "number",
      "digits": 4,
      "suffix": " m²"
    }
  ],
  "formula": {
    "expression": "Mosteller: √(height cm × weight kg ÷ 3600); other published equations use formula-specific powers of height and weight."
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "unitSystem": "metric",
        "sex": "male",
        "weightKg": 70,
        "heightCm": 175,
        "weightLb": 154,
        "feet": 5,
        "inches": 9
      }
    }
  ],
  "sources": [
    {
      "label": "Calculator.net reference calculator",
      "url": "https://www.calculator.net/body-surface-area-calculator.html"
    }
  ]
}