{
  "entity_type": "unit_conversion_page",
  "id": "square-meters-to-acres",
  "name": "Square meters to Acres",
  "title": "Square meters to Acres Converter (m² to acre)",
  "description": "Convert square meters to acres: 1 m² = 0.000247105 acre. 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": "m2",
    "display": "m²",
    "name": "square meters",
    "singular": "square meter"
  },
  "to_unit": {
    "symbol": "acre",
    "display": "acre",
    "name": "acres",
    "singular": "acre"
  },
  "linear": true,
  "factor": 0.0002471053815,
  "inverse_factor": 4046.856422,
  "formula": "acres = square meters × 0.0002471053815",
  "reverse_formula": "square meters = acres × 4046.856422",
  "unit_relation": "1 m² = 0.000247105 acre",
  "examples": [
    {
      "value": 5,
      "result": 0.00123553,
      "text": "5 m² = 0.00123553 acre"
    },
    {
      "value": 12.5,
      "result": 0.00308882,
      "text": "12.5 m² = 0.00308882 acre"
    },
    {
      "value": 100,
      "result": 0.0247105,
      "text": "100 m² = 0.0247105 acre"
    }
  ],
  "table": [
    {
      "m2": 1,
      "acre": 0.000247105
    },
    {
      "m2": 2,
      "acre": 0.000494211
    },
    {
      "m2": 3,
      "acre": 0.000741316
    },
    {
      "m2": 4,
      "acre": 0.000988422
    },
    {
      "m2": 5,
      "acre": 0.00123553
    },
    {
      "m2": 6,
      "acre": 0.00148263
    },
    {
      "m2": 7,
      "acre": 0.00172974
    },
    {
      "m2": 8,
      "acre": 0.00197684
    },
    {
      "m2": 9,
      "acre": 0.00222395
    },
    {
      "m2": 10,
      "acre": 0.00247105
    },
    {
      "m2": 15,
      "acre": 0.00370658
    },
    {
      "m2": 20,
      "acre": 0.00494211
    },
    {
      "m2": 25,
      "acre": 0.00617763
    },
    {
      "m2": 30,
      "acre": 0.00741316
    },
    {
      "m2": 40,
      "acre": 0.00988422
    },
    {
      "m2": 50,
      "acre": 0.0123553
    },
    {
      "m2": 75,
      "acre": 0.0185329
    },
    {
      "m2": 100,
      "acre": 0.0247105
    },
    {
      "m2": 200,
      "acre": 0.0494211
    },
    {
      "m2": 250,
      "acre": 0.0617763
    },
    {
      "m2": 500,
      "acre": 0.123553
    },
    {
      "m2": 1000,
      "acre": 0.247105
    }
  ],
  "faq": [
    {
      "q": "How many acres are in one square meter?",
      "a": "1 m² = 0.000247105 acre. 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 meters to acres?",
      "a": "Multiply the value in square meters by 0.0002471053815: acres = square meters × 0.0002471053815. For example, 5 m² = 0.00123553 acre."
    },
    {
      "q": "How do I convert acres back to square meters?",
      "a": "Multiply by the inverse factor 4046.856422 (square meters = acres × 4046.856422), or use the acres-to-square meters 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=m2&to_unit=acre",
    "calculator": "https://tttkmbb.com/api/v1/calculate/area?value=5&from_unit=m2&to_unit=acre",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "m2",
      "to_unit": "acre"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/square-meters-to-acres",
    "markdown": "https://tttkmbb.com/conversion/square-meters-to-acres.md",
    "json": "https://tttkmbb.com/conversion/square-meters-to-acres.json",
    "reverse": "https://tttkmbb.com/conversion/acres-to-square-meters",
    "quantity_converter": "https://tttkmbb.com/conversion/area",
    "units": "https://tttkmbb.com/api/v1/units?quantity=area"
  },
  "timestamp": "2026-09-24"
}