{
  "slug": "baking-pan-conversion",
  "title": "Baking Pan Size Conversion Calculator",
  "heading": "Baking Pan Conversion Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/baking-pan-conversion",
  "summary": "Swap pan sizes without ruining the bake — area ratio and batter depth.",
  "description": "Only have a 9×13 when the recipe wants two 8-inch rounds? Compare the surface area of what the recipe calls for against the pan you own, and see how much batter to use and whether the bake will run deeper or shallower.",
  "formula": "Ratio = new pan area ÷ original pan area.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=baking-pan-conversion",
  "inputs": [
    {
      "id": "ow",
      "label": "Recipe pan width/diameter",
      "kind": "number",
      "hint": null,
      "default": 8,
      "unit": "in",
      "min": 1,
      "max": null
    },
    {
      "id": "ol",
      "label": "Recipe pan length (same as width if round)",
      "kind": "number",
      "hint": null,
      "default": 8,
      "unit": "in",
      "min": 1,
      "max": null
    },
    {
      "id": "nw",
      "label": "Your pan width/diameter",
      "kind": "number",
      "hint": null,
      "default": 9,
      "unit": "in",
      "min": 1,
      "max": null
    },
    {
      "id": "nl",
      "label": "Your pan length",
      "kind": "number",
      "hint": null,
      "default": 13,
      "unit": "in",
      "min": 1,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "ratio",
      "label": "Area ratio (new ÷ old)",
      "format": "decimal",
      "hint": null,
      "primary": true
    },
    {
      "id": "batter",
      "label": "Batter needed vs recipe",
      "format": "percent",
      "hint": null,
      "primary": false
    },
    {
      "id": "depth",
      "label": "Relative batter depth",
      "format": "percent",
      "hint": null,
      "primary": false
    },
    {
      "id": "a1",
      "label": "Recipe pan area",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "a2",
      "label": "Your pan area",
      "format": "decimal",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Recipe pan width/diameter: 8 in",
      "Recipe pan length (same as width if round): 8 in",
      "Your pan width/diameter: 9 in",
      "Your pan length: 13 in"
    ],
    "outputs": [
      "Area ratio (new ÷ old): 1.83",
      "Batter needed vs recipe: 183%",
      "Relative batter depth: 55%",
      "Recipe pan area: 64",
      "Your pan area: 117"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter recipe pan width/diameter (in).",
      "Enter recipe pan length (same as width if round) (in).",
      "Enter your pan width/diameter (in).",
      "Enter your pan length (in).",
      "Read your area ratio (new ÷ old) 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": {
        "ow": 4.8,
        "ol": 4.8,
        "nw": 5.3999999999999995,
        "nl": 7.8
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "ow": 8,
        "ol": 8,
        "nw": 9,
        "nl": 13
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "ow": 12.8,
        "ol": 12.8,
        "nw": 14.4,
        "nl": 20.8
      }
    }
  ],
  "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": "What if the ratio is close to 1?",
      "a": "Anything between about 0.9 and 1.1 bakes essentially the same. Keep the recipe as written."
    },
    {
      "q": "How do I adjust bake time?",
      "a": "Shallower batter bakes faster. Start checking 5–10 minutes early when your depth number is below 100%."
    }
  ],
  "related": [],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Baking Pan Size Conversion Calculator (https://www.revenuelab.fyi/toolbox/baking-pan-conversion)"
}