{
  "entity_type": "unit_conversion_page",
  "id": "square-cm-to-square-inches",
  "name": "Square centimeters to Square inches",
  "title": "Square centimeters to Square inches Converter (cm² to in²)",
  "description": "Convert square centimeters to square inches: 1 cm² = 0.155 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": "cm2",
    "display": "cm²",
    "name": "square centimeters",
    "singular": "square centimeter"
  },
  "to_unit": {
    "symbol": "in2",
    "display": "in²",
    "name": "square inches",
    "singular": "square inch"
  },
  "linear": true,
  "factor": 0.15500031,
  "inverse_factor": 6.4516,
  "formula": "square inches = square centimeters × 0.15500031",
  "reverse_formula": "square centimeters = square inches × 6.4516",
  "unit_relation": "1 cm² = 0.155 in²",
  "examples": [
    {
      "value": 5,
      "result": 0.775002,
      "text": "5 cm² = 0.775002 in²"
    },
    {
      "value": 12.5,
      "result": 1.9375,
      "text": "12.5 cm² = 1.9375 in²"
    },
    {
      "value": 100,
      "result": 15.5,
      "text": "100 cm² = 15.5 in²"
    }
  ],
  "table": [
    {
      "cm2": 1,
      "in2": 0.155
    },
    {
      "cm2": 2,
      "in2": 0.310001
    },
    {
      "cm2": 3,
      "in2": 0.465001
    },
    {
      "cm2": 4,
      "in2": 0.620001
    },
    {
      "cm2": 5,
      "in2": 0.775002
    },
    {
      "cm2": 6,
      "in2": 0.930002
    },
    {
      "cm2": 7,
      "in2": 1.085
    },
    {
      "cm2": 8,
      "in2": 1.24
    },
    {
      "cm2": 9,
      "in2": 1.395
    },
    {
      "cm2": 10,
      "in2": 1.55
    },
    {
      "cm2": 15,
      "in2": 2.325
    },
    {
      "cm2": 20,
      "in2": 3.10001
    },
    {
      "cm2": 25,
      "in2": 3.87501
    },
    {
      "cm2": 30,
      "in2": 4.65001
    },
    {
      "cm2": 40,
      "in2": 6.20001
    },
    {
      "cm2": 50,
      "in2": 7.75002
    },
    {
      "cm2": 75,
      "in2": 11.625
    },
    {
      "cm2": 100,
      "in2": 15.5
    },
    {
      "cm2": 200,
      "in2": 31.0001
    },
    {
      "cm2": 250,
      "in2": 38.7501
    },
    {
      "cm2": 500,
      "in2": 77.5002
    },
    {
      "cm2": 1000,
      "in2": 155
    }
  ],
  "faq": [
    {
      "q": "How many square inches are in one square centimeter?",
      "a": "1 cm² = 0.155 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 centimeters to square inches?",
      "a": "Multiply the value in square centimeters by 0.15500031: square inches = square centimeters × 0.15500031. For example, 5 cm² = 0.775002 in²."
    },
    {
      "q": "How do I convert square inches back to square centimeters?",
      "a": "Multiply by the inverse factor 6.4516 (square centimeters = square inches × 6.4516), or use the square inches-to-square centimeters 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=cm2&to_unit=in2",
    "calculator": "https://tttkmbb.com/api/v1/calculate/area?value=5&from_unit=cm2&to_unit=in2",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "cm2",
      "to_unit": "in2"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/square-cm-to-square-inches",
    "markdown": "https://tttkmbb.com/conversion/square-cm-to-square-inches.md",
    "json": "https://tttkmbb.com/conversion/square-cm-to-square-inches.json",
    "reverse": "https://tttkmbb.com/conversion/square-inches-to-square-cm",
    "quantity_converter": "https://tttkmbb.com/conversion/area",
    "units": "https://tttkmbb.com/api/v1/units?quantity=area"
  },
  "timestamp": "2026-09-24"
}