{
  "entity_type": "unit_conversion_page",
  "id": "miles-to-nautical-miles",
  "name": "Miles to Nautical miles",
  "title": "Miles to Nautical miles Converter (mi to nmi)",
  "description": "Convert miles to nautical miles: 1 mi = 0.868976 nmi. 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": "nmi",
    "display": "nmi",
    "name": "nautical miles",
    "singular": "nautical mile"
  },
  "linear": true,
  "factor": 0.8689762419,
  "inverse_factor": 1.150779448,
  "formula": "nautical miles = miles × 0.8689762419",
  "reverse_formula": "miles = nautical miles × 1.150779448",
  "unit_relation": "1 mi = 0.868976 nmi",
  "examples": [
    {
      "value": 5,
      "result": 4.34488,
      "text": "5 mi = 4.34488 nmi"
    },
    {
      "value": 12.5,
      "result": 10.8622,
      "text": "12.5 mi = 10.8622 nmi"
    },
    {
      "value": 100,
      "result": 86.8976,
      "text": "100 mi = 86.8976 nmi"
    }
  ],
  "table": [
    {
      "mi": 1,
      "nmi": 0.868976
    },
    {
      "mi": 2,
      "nmi": 1.73795
    },
    {
      "mi": 3,
      "nmi": 2.60693
    },
    {
      "mi": 4,
      "nmi": 3.4759
    },
    {
      "mi": 5,
      "nmi": 4.34488
    },
    {
      "mi": 6,
      "nmi": 5.21386
    },
    {
      "mi": 7,
      "nmi": 6.08283
    },
    {
      "mi": 8,
      "nmi": 6.95181
    },
    {
      "mi": 9,
      "nmi": 7.82079
    },
    {
      "mi": 10,
      "nmi": 8.68976
    },
    {
      "mi": 15,
      "nmi": 13.0346
    },
    {
      "mi": 20,
      "nmi": 17.3795
    },
    {
      "mi": 25,
      "nmi": 21.7244
    },
    {
      "mi": 30,
      "nmi": 26.0693
    },
    {
      "mi": 40,
      "nmi": 34.759
    },
    {
      "mi": 50,
      "nmi": 43.4488
    },
    {
      "mi": 75,
      "nmi": 65.1732
    },
    {
      "mi": 100,
      "nmi": 86.8976
    },
    {
      "mi": 200,
      "nmi": 173.795
    },
    {
      "mi": 250,
      "nmi": 217.244
    },
    {
      "mi": 500,
      "nmi": 434.488
    },
    {
      "mi": 1000,
      "nmi": 868.976
    }
  ],
  "faq": [
    {
      "q": "How many nautical miles are in one mile?",
      "a": "1 mi = 0.868976 nmi. 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 nautical miles?",
      "a": "Multiply the value in miles by 0.8689762419: nautical miles = miles × 0.8689762419. For example, 5 mi = 4.34488 nmi."
    },
    {
      "q": "How do I convert nautical miles back to miles?",
      "a": "Multiply by the inverse factor 1.150779448 (miles = nautical miles × 1.150779448), or use the nautical miles-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=nmi",
    "calculator": "https://tttkmbb.com/api/v1/calculate/length?value=5&from_unit=mi&to_unit=nmi",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "mi",
      "to_unit": "nmi"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/miles-to-nautical-miles",
    "markdown": "https://tttkmbb.com/conversion/miles-to-nautical-miles.md",
    "json": "https://tttkmbb.com/conversion/miles-to-nautical-miles.json",
    "reverse": "https://tttkmbb.com/conversion/nautical-miles-to-miles",
    "quantity_converter": "https://tttkmbb.com/conversion/length",
    "units": "https://tttkmbb.com/api/v1/units?quantity=length"
  },
  "timestamp": "2026-09-24"
}