{
  "entity_type": "unit_conversion_page",
  "id": "square-feet-to-square-inches",
  "name": "Square feet to Square inches",
  "title": "Square feet to Square inches Converter (ft² to in²)",
  "description": "Convert square feet to square inches: 1 ft² = 144 in². Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.",
  "quantity": "area",
  "quantity_name": "Area",
  "base_unit": "m2",
  "from_unit": {
    "symbol": "ft2",
    "display": "ft²",
    "name": "square feet",
    "singular": "square foot"
  },
  "to_unit": {
    "symbol": "in2",
    "display": "in²",
    "name": "square inches",
    "singular": "square inch"
  },
  "linear": true,
  "factor": 144,
  "inverse_factor": 0.006944444444,
  "formula": "square inches = square feet × 144",
  "reverse_formula": "square feet = square inches × 0.006944444444",
  "unit_relation": "1 ft² = 144 in²",
  "examples": [
    {
      "value": 5,
      "result": 720,
      "text": "5 ft² = 720 in²"
    },
    {
      "value": 12.5,
      "result": 1800,
      "text": "12.5 ft² = 1800 in²"
    },
    {
      "value": 100,
      "result": 14400,
      "text": "100 ft² = 14400 in²"
    }
  ],
  "table": [
    {
      "ft2": 1,
      "in2": 144
    },
    {
      "ft2": 2,
      "in2": 288
    },
    {
      "ft2": 3,
      "in2": 432
    },
    {
      "ft2": 4,
      "in2": 576
    },
    {
      "ft2": 5,
      "in2": 720
    },
    {
      "ft2": 6,
      "in2": 864
    },
    {
      "ft2": 7,
      "in2": 1008
    },
    {
      "ft2": 8,
      "in2": 1152
    },
    {
      "ft2": 9,
      "in2": 1296
    },
    {
      "ft2": 10,
      "in2": 1440
    },
    {
      "ft2": 15,
      "in2": 2160
    },
    {
      "ft2": 20,
      "in2": 2880
    },
    {
      "ft2": 25,
      "in2": 3600
    },
    {
      "ft2": 30,
      "in2": 4320
    },
    {
      "ft2": 40,
      "in2": 5760
    },
    {
      "ft2": 50,
      "in2": 7200
    },
    {
      "ft2": 75,
      "in2": 10800
    },
    {
      "ft2": 100,
      "in2": 14400
    },
    {
      "ft2": 200,
      "in2": 28800
    },
    {
      "ft2": 250,
      "in2": 36000
    },
    {
      "ft2": 500,
      "in2": 72000
    },
    {
      "ft2": 1000,
      "in2": 144000
    }
  ],
  "faq": [
    {
      "q": "How many square inches are in one square foot?",
      "a": "1 ft² = 144 in². The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures."
    },
    {
      "q": "What is the formula to convert square feet to square inches?",
      "a": "Multiply the value in square feet by 144: square inches = square feet × 144. For example, 5 ft² = 720 in²."
    },
    {
      "q": "How do I convert square inches back to square feet?",
      "a": "Multiply by the inverse factor 0.006944444444 (square feet = square inches × 0.006944444444), or use the square inches-to-square feet page."
    }
  ],
  "sources": [
    {
      "name": "NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors",
      "url": "https://www.nist.gov/pml/special-publication-811",
      "type": "standard",
      "retrieved_at": "2026-09-24"
    },
    {
      "name": "BIPM – The International System of Units (SI Brochure, 9th edition)",
      "url": "https://www.bipm.org/en/publications/si-brochure",
      "type": "standard",
      "retrieved_at": "2026-09-24"
    },
    {
      "name": "Wikipedia – Conversion of units",
      "url": "https://en.wikipedia.org/wiki/Conversion_of_units",
      "type": "reference",
      "retrieved_at": "2026-09-24"
    }
  ],
  "freshness": {
    "type": "static",
    "max_age_seconds": null,
    "note": "Fixed conversion factors (NIST/BIPM definitions); results never go stale."
  },
  "api": {
    "convert": "https://tttkmbb.com/api/v1/convert?value=5&from_unit=ft2&to_unit=in2",
    "calculator": "https://tttkmbb.com/api/v1/calculate/area?value=5&from_unit=ft2&to_unit=in2",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "ft2",
      "to_unit": "in2"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/square-feet-to-square-inches",
    "markdown": "https://tttkmbb.com/conversion/square-feet-to-square-inches.md",
    "json": "https://tttkmbb.com/conversion/square-feet-to-square-inches.json",
    "reverse": "https://tttkmbb.com/conversion/square-inches-to-square-feet",
    "quantity_converter": "https://tttkmbb.com/conversion/area",
    "units": "https://tttkmbb.com/api/v1/units?quantity=area"
  },
  "timestamp": "2026-09-24"
}