{
  "entity_type": "unit_conversion_page",
  "id": "hp-to-watts",
  "name": "Horsepower (mechanical) to Watts",
  "title": "Horsepower (mechanical) to Watts Converter (hp to W)",
  "description": "Convert horsepower (mechanical) to watts: 1 hp = 745.7 W. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.",
  "quantity": "power",
  "quantity_name": "Power",
  "base_unit": "W",
  "from_unit": {
    "symbol": "hp",
    "display": "hp",
    "name": "horsepower (mechanical)",
    "singular": "horsepower"
  },
  "to_unit": {
    "symbol": "W",
    "display": "W",
    "name": "watts",
    "singular": "watt"
  },
  "linear": true,
  "factor": 745.6998716,
  "inverse_factor": 0.00134102209,
  "formula": "watts = horsepower (mechanical) × 745.6998716",
  "reverse_formula": "horsepower (mechanical) = watts × 0.00134102209",
  "unit_relation": "1 hp = 745.7 W",
  "examples": [
    {
      "value": 5,
      "result": 3728.5,
      "text": "5 hp = 3728.5 W"
    },
    {
      "value": 12.5,
      "result": 9321.25,
      "text": "12.5 hp = 9321.25 W"
    },
    {
      "value": 100,
      "result": 74570,
      "text": "100 hp = 74570 W"
    }
  ],
  "table": [
    {
      "hp": 1,
      "W": 745.7
    },
    {
      "hp": 2,
      "W": 1491.4
    },
    {
      "hp": 3,
      "W": 2237.1
    },
    {
      "hp": 4,
      "W": 2982.8
    },
    {
      "hp": 5,
      "W": 3728.5
    },
    {
      "hp": 6,
      "W": 4474.2
    },
    {
      "hp": 7,
      "W": 5219.9
    },
    {
      "hp": 8,
      "W": 5965.6
    },
    {
      "hp": 9,
      "W": 6711.3
    },
    {
      "hp": 10,
      "W": 7457
    },
    {
      "hp": 15,
      "W": 11185.5
    },
    {
      "hp": 20,
      "W": 14914
    },
    {
      "hp": 25,
      "W": 18642.5
    },
    {
      "hp": 30,
      "W": 22371
    },
    {
      "hp": 40,
      "W": 29828
    },
    {
      "hp": 50,
      "W": 37285
    },
    {
      "hp": 75,
      "W": 55927.5
    },
    {
      "hp": 100,
      "W": 74570
    },
    {
      "hp": 200,
      "W": 149140
    },
    {
      "hp": 250,
      "W": 186425
    },
    {
      "hp": 500,
      "W": 372850
    },
    {
      "hp": 1000,
      "W": 745700
    }
  ],
  "faq": [
    {
      "q": "How many watts are in one horsepower?",
      "a": "1 hp = 745.7 W. 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 horsepower (mechanical) to watts?",
      "a": "Multiply the value in horsepower (mechanical) by 745.6998716: watts = horsepower (mechanical) × 745.6998716. For example, 5 hp = 3728.5 W."
    },
    {
      "q": "How do I convert watts back to horsepower (mechanical)?",
      "a": "Multiply by the inverse factor 0.00134102209 (horsepower (mechanical) = watts × 0.00134102209), or use the watts-to-horsepower (mechanical) 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=hp&to_unit=W",
    "calculator": "https://tttkmbb.com/api/v1/calculate/power?value=5&from_unit=hp&to_unit=W",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "hp",
      "to_unit": "W"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/hp-to-watts",
    "markdown": "https://tttkmbb.com/conversion/hp-to-watts.md",
    "json": "https://tttkmbb.com/conversion/hp-to-watts.json",
    "reverse": "https://tttkmbb.com/conversion/watts-to-hp",
    "quantity_converter": "https://tttkmbb.com/conversion/power",
    "units": "https://tttkmbb.com/api/v1/units?quantity=power"
  },
  "timestamp": "2026-09-24"
}