{
  "entity_type": "unit_conversion_page",
  "id": "feet-per-second-to-mph",
  "name": "Feet per second to Miles per hour",
  "title": "Feet per second to Miles per hour Converter (ft/s to mph)",
  "description": "Convert feet per second to miles per hour: 1 ft/s = 0.681818 mph. 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": "ft/s",
    "display": "ft/s",
    "name": "feet per second",
    "singular": "foot per second"
  },
  "to_unit": {
    "symbol": "mph",
    "display": "mph",
    "name": "miles per hour",
    "singular": "mile per hour"
  },
  "linear": true,
  "factor": 0.6818181818,
  "inverse_factor": 1.466666667,
  "formula": "miles per hour = feet per second × 0.6818181818",
  "reverse_formula": "feet per second = miles per hour × 1.466666667",
  "unit_relation": "1 ft/s = 0.681818 mph",
  "examples": [
    {
      "value": 5,
      "result": 3.40909,
      "text": "5 ft/s = 3.40909 mph"
    },
    {
      "value": 12.5,
      "result": 8.52273,
      "text": "12.5 ft/s = 8.52273 mph"
    },
    {
      "value": 100,
      "result": 68.1818,
      "text": "100 ft/s = 68.1818 mph"
    }
  ],
  "table": [
    {
      "ft/s": 1,
      "mph": 0.681818
    },
    {
      "ft/s": 2,
      "mph": 1.36364
    },
    {
      "ft/s": 3,
      "mph": 2.04545
    },
    {
      "ft/s": 4,
      "mph": 2.72727
    },
    {
      "ft/s": 5,
      "mph": 3.40909
    },
    {
      "ft/s": 6,
      "mph": 4.09091
    },
    {
      "ft/s": 7,
      "mph": 4.77273
    },
    {
      "ft/s": 8,
      "mph": 5.45455
    },
    {
      "ft/s": 9,
      "mph": 6.13636
    },
    {
      "ft/s": 10,
      "mph": 6.81818
    },
    {
      "ft/s": 15,
      "mph": 10.2273
    },
    {
      "ft/s": 20,
      "mph": 13.6364
    },
    {
      "ft/s": 25,
      "mph": 17.0455
    },
    {
      "ft/s": 30,
      "mph": 20.4545
    },
    {
      "ft/s": 40,
      "mph": 27.2727
    },
    {
      "ft/s": 50,
      "mph": 34.0909
    },
    {
      "ft/s": 75,
      "mph": 51.1364
    },
    {
      "ft/s": 100,
      "mph": 68.1818
    },
    {
      "ft/s": 200,
      "mph": 136.364
    },
    {
      "ft/s": 250,
      "mph": 170.455
    },
    {
      "ft/s": 500,
      "mph": 340.909
    },
    {
      "ft/s": 1000,
      "mph": 681.818
    }
  ],
  "faq": [
    {
      "q": "How many miles per hour are in one foot per second?",
      "a": "1 ft/s = 0.681818 mph. 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 feet per second to miles per hour?",
      "a": "Multiply the value in feet per second by 0.6818181818: miles per hour = feet per second × 0.6818181818. For example, 5 ft/s = 3.40909 mph."
    },
    {
      "q": "How do I convert miles per hour back to feet per second?",
      "a": "Multiply by the inverse factor 1.466666667 (feet per second = miles per hour × 1.466666667), or use the miles per hour-to-feet per second 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=ft%2Fs&to_unit=mph",
    "calculator": "https://tttkmbb.com/api/v1/calculate/speed?value=5&from_unit=ft%2Fs&to_unit=mph",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "ft/s",
      "to_unit": "mph"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/feet-per-second-to-mph",
    "markdown": "https://tttkmbb.com/conversion/feet-per-second-to-mph.md",
    "json": "https://tttkmbb.com/conversion/feet-per-second-to-mph.json",
    "reverse": "https://tttkmbb.com/conversion/mph-to-feet-per-second",
    "quantity_converter": "https://tttkmbb.com/conversion/speed",
    "units": "https://tttkmbb.com/api/v1/units?quantity=speed"
  },
  "timestamp": "2026-09-24"
}