{
  "id": "protein-calculator",
  "version": "2.0.0",
  "name": "Protein Calculator",
  "shortName": "Protein",
  "description": "Estimate a weight-based daily protein range for general adult, older-adult, endurance, strength, calorie-deficit, or pregnancy contexts.",
  "category": "Health & Fitness",
  "categorySlug": "health-fitness",
  "keywords": [
    "protein per day",
    "grams per kilogram",
    "strength protein",
    "endurance protein",
    "pregnancy protein"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "migrated",
  "migratedDate": "2026-08-25",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/protein-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": "Protein needs can change with kidney disease, pregnancy, age, training, illness, and overall energy intake. This is not individualized nutrition advice.",
  "urls": {
    "page": "/calculator/protein-calculator/",
    "definition": "/calculator/protein-calculator/definition.json",
    "schema": "/calculator/protein-calculator/schema.json",
    "llms": "/calculator/protein-calculator/llms.txt",
    "legacyDefinition": "/calculator/protein-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/protein-calculator/?unitSystem=metric&weightKg=70&scenario=general&meals=4",
  "queryParameters": {
    "unitSystem": {
      "label": "Weight units",
      "type": "select",
      "required": true,
      "default": "metric"
    },
    "weightKg": {
      "label": "Body weight",
      "type": "number",
      "required": true,
      "default": 70,
      "showWhen": {
        "field": "unitSystem",
        "equals": "metric"
      }
    },
    "weightLb": {
      "label": "Body weight",
      "type": "number",
      "required": true,
      "default": 154,
      "showWhen": {
        "field": "unitSystem",
        "equals": "imperial"
      }
    },
    "scenario": {
      "label": "Activity or life-stage reference",
      "type": "select",
      "required": true,
      "default": "general"
    },
    "meals": {
      "label": "Meals or feedings per day",
      "type": "number",
      "required": true,
      "default": 4
    }
  },
  "inputs": [
    {
      "id": "unitSystem",
      "label": "Weight units",
      "type": "select",
      "required": true,
      "defaultValue": "metric",
      "options": [
        {
          "label": "Kilograms",
          "value": "metric"
        },
        {
          "label": "Pounds",
          "value": "imperial"
        }
      ],
      "width": "full"
    },
    {
      "id": "weightKg",
      "label": "Body weight",
      "type": "number",
      "required": true,
      "defaultValue": 70,
      "min": 20,
      "max": 500,
      "step": 0.1,
      "suffix": "kg",
      "showWhen": {
        "field": "unitSystem",
        "equals": "metric"
      },
      "width": "full"
    },
    {
      "id": "weightLb",
      "label": "Body weight",
      "type": "number",
      "required": true,
      "defaultValue": 154,
      "min": 44,
      "max": 1100,
      "step": 0.1,
      "suffix": "lb",
      "showWhen": {
        "field": "unitSystem",
        "equals": "imperial"
      },
      "width": "full"
    },
    {
      "id": "scenario",
      "label": "Activity or life-stage reference",
      "type": "select",
      "required": true,
      "defaultValue": "general",
      "options": [
        {
          "label": "General healthy adult",
          "value": "general"
        },
        {
          "label": "Older adult reference",
          "value": "older"
        },
        {
          "label": "Endurance training",
          "value": "endurance"
        },
        {
          "label": "Strength training",
          "value": "strength"
        },
        {
          "label": "Calorie deficit / weight loss",
          "value": "weightLoss"
        },
        {
          "label": "Pregnancy reference",
          "value": "pregnancy"
        }
      ],
      "width": "full"
    },
    {
      "id": "meals",
      "label": "Meals or feedings per day",
      "type": "number",
      "required": true,
      "defaultValue": 4,
      "min": 1,
      "max": 10,
      "step": 1,
      "width": "full"
    }
  ],
  "outputs": [
    {
      "id": "proteinRange",
      "label": "Estimated daily protein range",
      "format": "text",
      "primary": true
    },
    {
      "id": "midpoint",
      "label": "Range midpoint",
      "format": "number",
      "digits": 0,
      "suffix": " g/day"
    },
    {
      "id": "perMeal",
      "label": "Midpoint per meal",
      "format": "number",
      "digits": 0,
      "suffix": " g"
    },
    {
      "id": "energyRange",
      "label": "Energy from protein",
      "format": "text"
    },
    {
      "id": "factor",
      "label": "Weight factor",
      "format": "text"
    }
  ],
  "formula": {
    "expression": "Protein range = body weight (kg) × scenario-specific grams-per-kilogram interval."
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "unitSystem": "metric",
        "weightKg": 70,
        "weightLb": 154,
        "scenario": "general",
        "meals": 4
      }
    }
  ],
  "sources": [
    {
      "label": "Calculator.net reference calculator",
      "url": "https://www.calculator.net/protein-calculator.html"
    }
  ]
}