{
  "slug": "pet-age",
  "title": "Pet Age Calculator (Dog & Cat Years)",
  "heading": "Dog & Cat Age Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/pet-age",
  "summary": "Convert pet years to human-equivalent age using size-adjusted curves.",
  "description": "The 'multiply by seven' rule is wrong at both ends of life. Dogs age fast in year one, then slow at a rate that depends on adult size, while cats follow a steadier curve. This calculator uses the size-banded AVMA-style mapping instead.",
  "formula": "Dogs: 15 human years for year 1, 9 for year 2, then 4–6 per year by size band. Cats: 15, then 9, then 4 per year.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=pet-age",
  "inputs": [
    {
      "id": "species",
      "label": "Species",
      "kind": "select",
      "hint": null,
      "default": "dog",
      "options": [
        {
          "value": "dog",
          "label": "Dog"
        },
        {
          "value": "cat",
          "label": "Cat"
        }
      ]
    },
    {
      "id": "age",
      "label": "Pet's age",
      "kind": "number",
      "hint": null,
      "default": 5,
      "unit": "years",
      "min": 0,
      "max": 30
    },
    {
      "id": "size",
      "label": "Adult size (dogs)",
      "kind": "select",
      "hint": null,
      "default": "medium",
      "options": [
        {
          "value": "small",
          "label": "Small — under 20 lb"
        },
        {
          "value": "medium",
          "label": "Medium — 21–50 lb"
        },
        {
          "value": "large",
          "label": "Large — 51–100 lb"
        },
        {
          "value": "giant",
          "label": "Giant — over 100 lb"
        }
      ]
    }
  ],
  "outputs": [
    {
      "id": "human",
      "label": "Human-equivalent age",
      "format": "decimal",
      "hint": null,
      "primary": true
    },
    {
      "id": "stage",
      "label": "Life stage",
      "format": "raw",
      "hint": null,
      "primary": false
    },
    {
      "id": "expectancy",
      "label": "Typical life expectancy (years)",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "remaining",
      "label": "Typical years remaining",
      "format": "decimal",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Species: Dog",
      "Pet's age: 5 years",
      "Adult size (dogs): Medium — 21–50 lb"
    ],
    "outputs": [
      "Human-equivalent age: 39",
      "Life stage: Adult",
      "Typical life expectancy (years): 13",
      "Typical years remaining: 8"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter species.",
      "Enter pet's age (years).",
      "Enter adult size (dogs).",
      "Read your human-equivalent age on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "species": "dog",
        "age": 5,
        "size": "medium"
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "species": "dog",
        "age": 5,
        "size": "medium"
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "species": "dog",
        "age": 5,
        "size": "medium"
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "Why does size change dog aging so much?",
      "a": "Large breeds reach skeletal maturity later but age faster afterward. A Great Dane is functionally geriatric around six or seven, while a similar-aged terrier is barely middle-aged."
    },
    {
      "q": "When does senior care start?",
      "a": "Most vets start twice-yearly exams and bloodwork at roughly 75% of expected lifespan — around seven for large dogs and ten for cats and small dogs."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/dog-food-portion",
    "https://www.revenuelab.fyi/toolbox/cat-food-portion"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Pet Age Calculator (Dog & Cat Years) (https://www.revenuelab.fyi/toolbox/pet-age)"
}