{
  "entity_type": "unit_conversion_page",
  "id": "joules-to-foot-pounds",
  "name": "Joules to Foot-pounds",
  "title": "Joules to Foot-pounds Converter (J to ft·lbf)",
  "description": "Convert joules to foot-pounds: 1 J = 0.737562 ft·lbf. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.",
  "quantity": "energy",
  "quantity_name": "Energy",
  "base_unit": "J",
  "from_unit": {
    "symbol": "J",
    "display": "J",
    "name": "joules",
    "singular": "joule"
  },
  "to_unit": {
    "symbol": "ft_lbf",
    "display": "ft·lbf",
    "name": "foot-pounds",
    "singular": "foot-pound"
  },
  "linear": true,
  "factor": 0.7375621493,
  "inverse_factor": 1.355817948,
  "formula": "foot-pounds = joules × 0.7375621493",
  "reverse_formula": "joules = foot-pounds × 1.355817948",
  "unit_relation": "1 J = 0.737562 ft·lbf",
  "examples": [
    {
      "value": 5,
      "result": 3.68781,
      "text": "5 J = 3.68781 ft·lbf"
    },
    {
      "value": 12.5,
      "result": 9.21953,
      "text": "12.5 J = 9.21953 ft·lbf"
    },
    {
      "value": 100,
      "result": 73.7562,
      "text": "100 J = 73.7562 ft·lbf"
    }
  ],
  "table": [
    {
      "J": 1,
      "ft_lbf": 0.737562
    },
    {
      "J": 2,
      "ft_lbf": 1.47512
    },
    {
      "J": 3,
      "ft_lbf": 2.21269
    },
    {
      "J": 4,
      "ft_lbf": 2.95025
    },
    {
      "J": 5,
      "ft_lbf": 3.68781
    },
    {
      "J": 6,
      "ft_lbf": 4.42537
    },
    {
      "J": 7,
      "ft_lbf": 5.16294
    },
    {
      "J": 8,
      "ft_lbf": 5.9005
    },
    {
      "J": 9,
      "ft_lbf": 6.63806
    },
    {
      "J": 10,
      "ft_lbf": 7.37562
    },
    {
      "J": 15,
      "ft_lbf": 11.0634
    },
    {
      "J": 20,
      "ft_lbf": 14.7512
    },
    {
      "J": 25,
      "ft_lbf": 18.4391
    },
    {
      "J": 30,
      "ft_lbf": 22.1269
    },
    {
      "J": 40,
      "ft_lbf": 29.5025
    },
    {
      "J": 50,
      "ft_lbf": 36.8781
    },
    {
      "J": 75,
      "ft_lbf": 55.3172
    },
    {
      "J": 100,
      "ft_lbf": 73.7562
    },
    {
      "J": 200,
      "ft_lbf": 147.512
    },
    {
      "J": 250,
      "ft_lbf": 184.391
    },
    {
      "J": 500,
      "ft_lbf": 368.781
    },
    {
      "J": 1000,
      "ft_lbf": 737.562
    }
  ],
  "faq": [
    {
      "q": "How many foot-pounds are in one joule?",
      "a": "1 J = 0.737562 ft·lbf. 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 joules to foot-pounds?",
      "a": "Multiply the value in joules by 0.7375621493: foot-pounds = joules × 0.7375621493. For example, 5 J = 3.68781 ft·lbf."
    },
    {
      "q": "How do I convert foot-pounds back to joules?",
      "a": "Multiply by the inverse factor 1.355817948 (joules = foot-pounds × 1.355817948), or use the foot-pounds-to-joules 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=J&to_unit=ft_lbf",
    "calculator": "https://tttkmbb.com/api/v1/calculate/energy?value=5&from_unit=J&to_unit=ft_lbf",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "J",
      "to_unit": "ft_lbf"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/joules-to-foot-pounds",
    "markdown": "https://tttkmbb.com/conversion/joules-to-foot-pounds.md",
    "json": "https://tttkmbb.com/conversion/joules-to-foot-pounds.json",
    "reverse": "https://tttkmbb.com/conversion/foot-pounds-to-joules",
    "quantity_converter": "https://tttkmbb.com/conversion/energy",
    "units": "https://tttkmbb.com/api/v1/units?quantity=energy"
  },
  "timestamp": "2026-09-24"
}