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