{
  "entity_type": "unit_conversion_page",
  "id": "miles-to-km",
  "name": "Miles to Kilometers",
  "title": "Miles to Kilometers Converter (mi to km)",
  "description": "Convert miles to kilometers: 1 mi = 1.60934 km. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.",
  "quantity": "length",
  "quantity_name": "Length",
  "base_unit": "m",
  "from_unit": {
    "symbol": "mi",
    "display": "mi",
    "name": "miles",
    "singular": "mile"
  },
  "to_unit": {
    "symbol": "km",
    "display": "km",
    "name": "kilometers",
    "singular": "kilometer"
  },
  "linear": true,
  "factor": 1.609344,
  "inverse_factor": 0.6213711922,
  "formula": "kilometers = miles × 1.609344",
  "reverse_formula": "miles = kilometers × 0.6213711922",
  "unit_relation": "1 mi = 1.60934 km",
  "examples": [
    {
      "value": 5,
      "result": 8.04672,
      "text": "5 mi = 8.04672 km"
    },
    {
      "value": 12.5,
      "result": 20.1168,
      "text": "12.5 mi = 20.1168 km"
    },
    {
      "value": 100,
      "result": 160.934,
      "text": "100 mi = 160.934 km"
    }
  ],
  "table": [
    {
      "mi": 1,
      "km": 1.60934
    },
    {
      "mi": 2,
      "km": 3.21869
    },
    {
      "mi": 3,
      "km": 4.82803
    },
    {
      "mi": 4,
      "km": 6.43738
    },
    {
      "mi": 5,
      "km": 8.04672
    },
    {
      "mi": 6,
      "km": 9.65606
    },
    {
      "mi": 7,
      "km": 11.2654
    },
    {
      "mi": 8,
      "km": 12.8748
    },
    {
      "mi": 9,
      "km": 14.4841
    },
    {
      "mi": 10,
      "km": 16.0934
    },
    {
      "mi": 15,
      "km": 24.1402
    },
    {
      "mi": 20,
      "km": 32.1869
    },
    {
      "mi": 25,
      "km": 40.2336
    },
    {
      "mi": 30,
      "km": 48.2803
    },
    {
      "mi": 40,
      "km": 64.3738
    },
    {
      "mi": 50,
      "km": 80.4672
    },
    {
      "mi": 75,
      "km": 120.701
    },
    {
      "mi": 100,
      "km": 160.934
    },
    {
      "mi": 200,
      "km": 321.869
    },
    {
      "mi": 250,
      "km": 402.336
    },
    {
      "mi": 500,
      "km": 804.672
    },
    {
      "mi": 1000,
      "km": 1609.34
    }
  ],
  "faq": [
    {
      "q": "How many kilometers are in one mile?",
      "a": "1 mi = 1.60934 km. 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 miles to kilometers?",
      "a": "Multiply the value in miles by 1.609344: kilometers = miles × 1.609344. For example, 5 mi = 8.04672 km."
    },
    {
      "q": "How do I convert kilometers back to miles?",
      "a": "Multiply by the inverse factor 0.6213711922 (miles = kilometers × 0.6213711922), or use the kilometers-to-miles 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=mi&to_unit=km",
    "calculator": "https://tttkmbb.com/api/v1/calculate/length?value=5&from_unit=mi&to_unit=km",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "mi",
      "to_unit": "km"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/miles-to-km",
    "markdown": "https://tttkmbb.com/conversion/miles-to-km.md",
    "json": "https://tttkmbb.com/conversion/miles-to-km.json",
    "reverse": "https://tttkmbb.com/conversion/km-to-miles",
    "quantity_converter": "https://tttkmbb.com/conversion/length",
    "units": "https://tttkmbb.com/api/v1/units?quantity=length"
  },
  "timestamp": "2026-09-24"
}