{
  "id": "bmr-calculator",
  "version": "2.0.0",
  "name": "BMR Calculator",
  "shortName": "BMR",
  "description": "Estimate basal metabolic rate with Mifflin–St Jeor, revised Harris–Benedict, or Katch–McArdle and view activity-adjusted daily energy needs.",
  "category": "Health & Fitness",
  "categorySlug": "health-fitness",
  "keywords": [
    "basal metabolic rate",
    "Mifflin St Jeor",
    "Harris Benedict",
    "Katch McArdle",
    "daily calories"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "new",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/bmr-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": "BMR and activity multipliers estimate energy use; individual metabolism and medical needs vary.",
  "urls": {
    "page": "/calculator/bmr-calculator/",
    "definition": "/calculator/bmr-calculator/definition.json",
    "schema": "/calculator/bmr-calculator/schema.json",
    "llms": "/calculator/bmr-calculator/llms.txt",
    "legacyDefinition": "/calculator/bmr-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/bmr-calculator/?unitSystem=metric&sex=male&age=30&formula=mifflin&weightKg=70&heightCm=175&activity=moderate&energyUnit=kcal",
  "queryParameters": {
    "unitSystem": {
      "label": "Units",
      "type": "select",
      "required": true,
      "default": "metric"
    },
    "sex": {
      "label": "Sex used by equation",
      "type": "select",
      "required": true,
      "default": "male"
    },
    "age": {
      "label": "Age",
      "type": "number",
      "required": true,
      "default": 30
    },
    "formula": {
      "label": "BMR equation",
      "type": "select",
      "required": true,
      "default": "mifflin"
    },
    "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"
      }
    },
    "bodyFatPercent": {
      "label": "Body fat",
      "type": "percent",
      "required": false,
      "default": 20,
      "showWhen": {
        "field": "formula",
        "equals": "katch"
      }
    },
    "activity": {
      "label": "Activity level",
      "type": "select",
      "required": true,
      "default": "moderate"
    },
    "energyUnit": {
      "label": "Energy display",
      "type": "select",
      "required": true,
      "default": "kcal"
    }
  },
  "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": "age",
      "label": "Age",
      "type": "number",
      "required": true,
      "defaultValue": 30,
      "min": 13,
      "max": 120,
      "step": 1,
      "suffix": "years",
      "width": "half"
    },
    {
      "id": "formula",
      "label": "BMR equation",
      "type": "select",
      "required": true,
      "defaultValue": "mifflin",
      "options": [
        {
          "label": "Mifflin–St Jeor",
          "value": "mifflin"
        },
        {
          "label": "Revised Harris–Benedict",
          "value": "harris"
        },
        {
          "label": "Katch–McArdle (body fat required)",
          "value": "katch"
        }
      ],
      "width": "full"
    },
    {
      "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"
    },
    {
      "id": "bodyFatPercent",
      "label": "Body fat",
      "type": "percent",
      "defaultValue": 20,
      "min": 1,
      "max": 79,
      "step": 0.1,
      "suffix": "%",
      "showWhen": {
        "field": "formula",
        "equals": "katch"
      },
      "width": "full"
    },
    {
      "id": "activity",
      "label": "Activity level",
      "type": "select",
      "required": true,
      "defaultValue": "moderate",
      "options": [
        {
          "label": "Sedentary: little exercise",
          "value": "sedentary"
        },
        {
          "label": "Light: exercise 1–3 days/week",
          "value": "light"
        },
        {
          "label": "Moderate: exercise 3–5 days/week",
          "value": "moderate"
        },
        {
          "label": "Active: hard exercise 6–7 days/week",
          "value": "active"
        },
        {
          "label": "Very active: hard exercise or physical job",
          "value": "veryActive"
        },
        {
          "label": "Extra active: very hard training and physical job",
          "value": "extraActive"
        }
      ],
      "width": "full"
    },
    {
      "id": "energyUnit",
      "label": "Energy display",
      "type": "select",
      "required": true,
      "defaultValue": "kcal",
      "options": [
        {
          "label": "Calories (kcal)",
          "value": "kcal"
        },
        {
          "label": "Kilojoules (kJ)",
          "value": "kj"
        }
      ],
      "width": "full"
    }
  ],
  "outputs": [
    {
      "id": "bmr",
      "label": "Basal metabolic rate",
      "format": "number",
      "primary": true,
      "digits": 0
    },
    {
      "id": "sedentary",
      "label": "Sedentary daily need",
      "format": "number",
      "digits": 0
    },
    {
      "id": "moderate",
      "label": "Moderate-activity daily need",
      "format": "number",
      "digits": 0
    },
    {
      "id": "veryActive",
      "label": "Very-active daily need",
      "format": "number",
      "digits": 0
    },
    {
      "id": "equation",
      "label": "Equation used",
      "format": "text"
    }
  ],
  "formula": {
    "expression": "Mifflin: 10W + 6.25H − 5A + s; revised Harris–Benedict uses sex-specific coefficients; Katch–McArdle: 370 + 21.6 × lean mass (kg)."
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "unitSystem": "metric",
        "sex": "male",
        "age": 30,
        "formula": "mifflin",
        "weightKg": 70,
        "heightCm": 175,
        "weightLb": 154,
        "feet": 5,
        "inches": 9,
        "bodyFatPercent": 20,
        "activity": "moderate",
        "energyUnit": "kcal"
      }
    }
  ],
  "sources": [
    {
      "label": "Calculator.net reference calculator",
      "url": "https://www.calculator.net/bmr-calculator.html"
    }
  ]
}