{
  "id": "bac-calculator",
  "version": "2.0.0",
  "name": "BAC Calculator",
  "shortName": "BAC",
  "description": "Estimate blood alcohol concentration from detailed beer, wine, spirit, and custom beverage amounts using a Widmark-style model.",
  "category": "Health & Fitness",
  "categorySlug": "health-fitness",
  "keywords": [
    "blood alcohol content",
    "BAC estimate",
    "Widmark formula",
    "standard drinks",
    "alcohol metabolism"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "migrated",
  "migratedDate": "2026-08-25",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/bac-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": "Never use a BAC estimate to decide whether to drive, operate equipment, supervise others, or delay emergency care. Actual BAC can be higher or lower.",
  "urls": {
    "page": "/calculator/bac-calculator/",
    "definition": "/calculator/bac-calculator/definition.json",
    "schema": "/calculator/bac-calculator/schema.json",
    "llms": "/calculator/bac-calculator/llms.txt",
    "legacyDefinition": "/calculator/bac-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/bac-calculator/?unitSystem=imperial&sex=male&weightLb=180&hoursSinceFirstDrink=2&beerCount=3&beerSizeOz=12&beerAbv=5&wineCount=0&wineSizeOz=5&wineAbv=12&spiritCount=0&spiritSizeOz=1.5&spiritAbv=40&otherVolumeOz=0&otherAbv=0&metabolismRate=0.015",
  "queryParameters": {
    "unitSystem": {
      "label": "Body-weight units",
      "type": "select",
      "required": true,
      "default": "imperial"
    },
    "sex": {
      "label": "Sex-based distribution factor",
      "type": "select",
      "required": true,
      "default": "male"
    },
    "weightLb": {
      "label": "Body weight",
      "type": "number",
      "required": true,
      "default": 180,
      "showWhen": {
        "field": "unitSystem",
        "equals": "imperial"
      }
    },
    "weightKg": {
      "label": "Body weight",
      "type": "number",
      "required": true,
      "default": 82,
      "showWhen": {
        "field": "unitSystem",
        "equals": "metric"
      }
    },
    "hoursSinceFirstDrink": {
      "label": "Hours since first drink",
      "type": "number",
      "required": true,
      "default": 2
    },
    "beerCount": {
      "label": "Beer servings",
      "type": "number",
      "required": true,
      "default": 3
    },
    "beerSizeOz": {
      "label": "Beer serving size",
      "type": "number",
      "required": true,
      "default": 12
    },
    "beerAbv": {
      "label": "Beer alcohol",
      "type": "percent",
      "required": true,
      "default": 5
    },
    "wineCount": {
      "label": "Wine servings",
      "type": "number",
      "required": true,
      "default": 0
    },
    "wineSizeOz": {
      "label": "Wine serving size",
      "type": "number",
      "required": true,
      "default": 5
    },
    "wineAbv": {
      "label": "Wine alcohol",
      "type": "percent",
      "required": true,
      "default": 12
    },
    "spiritCount": {
      "label": "Spirit servings",
      "type": "number",
      "required": true,
      "default": 0
    },
    "spiritSizeOz": {
      "label": "Spirit serving size",
      "type": "number",
      "required": true,
      "default": 1.5
    },
    "spiritAbv": {
      "label": "Spirit alcohol",
      "type": "percent",
      "required": true,
      "default": 40
    },
    "otherVolumeOz": {
      "label": "Other beverage total volume",
      "type": "number",
      "required": true,
      "default": 0
    },
    "otherAbv": {
      "label": "Other beverage alcohol",
      "type": "percent",
      "required": true,
      "default": 0
    },
    "metabolismRate": {
      "label": "Assumed elimination rate",
      "type": "number",
      "required": true,
      "default": 0.015
    }
  },
  "inputs": [
    {
      "id": "unitSystem",
      "label": "Body-weight units",
      "type": "select",
      "required": true,
      "defaultValue": "imperial",
      "options": [
        {
          "label": "Pounds",
          "value": "imperial"
        },
        {
          "label": "Kilograms",
          "value": "metric"
        }
      ],
      "width": "full"
    },
    {
      "id": "sex",
      "label": "Sex-based distribution factor",
      "type": "select",
      "required": true,
      "defaultValue": "male",
      "options": [
        {
          "label": "Male factor",
          "value": "male"
        },
        {
          "label": "Female factor",
          "value": "female"
        }
      ],
      "width": "half"
    },
    {
      "id": "weightLb",
      "label": "Body weight",
      "type": "number",
      "required": true,
      "defaultValue": 180,
      "min": 50,
      "max": 1000,
      "step": 0.1,
      "suffix": "lb",
      "showWhen": {
        "field": "unitSystem",
        "equals": "imperial"
      },
      "width": "half"
    },
    {
      "id": "weightKg",
      "label": "Body weight",
      "type": "number",
      "required": true,
      "defaultValue": 82,
      "min": 20,
      "max": 450,
      "step": 0.1,
      "suffix": "kg",
      "showWhen": {
        "field": "unitSystem",
        "equals": "metric"
      },
      "width": "half"
    },
    {
      "id": "hoursSinceFirstDrink",
      "label": "Hours since first drink",
      "type": "number",
      "required": true,
      "defaultValue": 2,
      "min": 0,
      "max": 48,
      "step": 0.1,
      "suffix": "hours",
      "width": "half"
    },
    {
      "id": "beerCount",
      "label": "Beer servings",
      "type": "number",
      "required": true,
      "defaultValue": 3,
      "min": 0,
      "max": 50,
      "step": 0.25,
      "width": "half"
    },
    {
      "id": "beerSizeOz",
      "label": "Beer serving size",
      "type": "number",
      "required": true,
      "defaultValue": 12,
      "min": 0,
      "max": 64,
      "step": 0.1,
      "suffix": "fl oz",
      "width": "half"
    },
    {
      "id": "beerAbv",
      "label": "Beer alcohol",
      "type": "percent",
      "required": true,
      "defaultValue": 5,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "suffix": "% ABV",
      "width": "half"
    },
    {
      "id": "wineCount",
      "label": "Wine servings",
      "type": "number",
      "required": true,
      "defaultValue": 0,
      "min": 0,
      "max": 50,
      "step": 0.25,
      "width": "half"
    },
    {
      "id": "wineSizeOz",
      "label": "Wine serving size",
      "type": "number",
      "required": true,
      "defaultValue": 5,
      "min": 0,
      "max": 32,
      "step": 0.1,
      "suffix": "fl oz",
      "width": "half"
    },
    {
      "id": "wineAbv",
      "label": "Wine alcohol",
      "type": "percent",
      "required": true,
      "defaultValue": 12,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "suffix": "% ABV",
      "width": "half"
    },
    {
      "id": "spiritCount",
      "label": "Spirit servings",
      "type": "number",
      "required": true,
      "defaultValue": 0,
      "min": 0,
      "max": 50,
      "step": 0.25,
      "width": "half"
    },
    {
      "id": "spiritSizeOz",
      "label": "Spirit serving size",
      "type": "number",
      "required": true,
      "defaultValue": 1.5,
      "min": 0,
      "max": 16,
      "step": 0.1,
      "suffix": "fl oz",
      "width": "half"
    },
    {
      "id": "spiritAbv",
      "label": "Spirit alcohol",
      "type": "percent",
      "required": true,
      "defaultValue": 40,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "suffix": "% ABV",
      "width": "half"
    },
    {
      "id": "otherVolumeOz",
      "label": "Other beverage total volume",
      "type": "number",
      "required": true,
      "defaultValue": 0,
      "min": 0,
      "max": 1000,
      "step": 0.1,
      "suffix": "fl oz",
      "width": "half"
    },
    {
      "id": "otherAbv",
      "label": "Other beverage alcohol",
      "type": "percent",
      "required": true,
      "defaultValue": 0,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "suffix": "% ABV",
      "width": "half"
    },
    {
      "id": "metabolismRate",
      "label": "Assumed elimination rate",
      "type": "number",
      "required": true,
      "defaultValue": 0.015,
      "min": 0.005,
      "max": 0.03,
      "step": 0.001,
      "suffix": "BAC/hour",
      "width": "full"
    }
  ],
  "outputs": [
    {
      "id": "estimatedBac",
      "label": "Estimated current BAC",
      "format": "percent",
      "primary": true,
      "digits": 3
    },
    {
      "id": "peakBac",
      "label": "Estimated pre-elimination BAC",
      "format": "percent",
      "digits": 3
    },
    {
      "id": "standardDrinks",
      "label": "Approximate U.S. standard drinks",
      "format": "number",
      "digits": 2
    },
    {
      "id": "alcoholGrams",
      "label": "Pure alcohol consumed",
      "format": "number",
      "digits": 1,
      "suffix": " g"
    },
    {
      "id": "hoursToZero",
      "label": "Additional estimated time to zero",
      "format": "number",
      "digits": 1,
      "suffix": " hours"
    },
    {
      "id": "safetyMessage",
      "label": "Safety message",
      "format": "text"
    }
  ],
  "formula": {
    "expression": "Alcohol grams = volume × ABV × ethanol density; Widmark-style BAC = alcohol grams ÷ (distribution factor × body mass grams) × 100 − elimination rate × hours."
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "unitSystem": "imperial",
        "sex": "male",
        "weightLb": 180,
        "weightKg": 82,
        "hoursSinceFirstDrink": 2,
        "beerCount": 3,
        "beerSizeOz": 12,
        "beerAbv": 5,
        "wineCount": 0,
        "wineSizeOz": 5,
        "wineAbv": 12,
        "spiritCount": 0,
        "spiritSizeOz": 1.5,
        "spiritAbv": 40,
        "otherVolumeOz": 0,
        "otherAbv": 0,
        "metabolismRate": 0.015
      }
    }
  ],
  "sources": [
    {
      "label": "Calculator.net reference calculator",
      "url": "https://www.calculator.net/bac-calculator.html"
    },
    {
      "label": "NIAAA standard drink information",
      "url": "https://www.niaaa.nih.gov/alcohols-effects-health/overview-alcohol-consumption/what-standard-drink"
    }
  ]
}