{
  "entity_type": "unit_conversion_page",
  "id": "lbs-to-kg",
  "name": "Pounds to Kilograms",
  "title": "Pounds to Kilograms Converter (lb to kg)",
  "description": "Convert pounds to kilograms: 1 lb = 0.453592 kg. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.",
  "quantity": "mass",
  "quantity_name": "Mass",
  "base_unit": "kg",
  "from_unit": {
    "symbol": "lb",
    "display": "lb",
    "name": "pounds",
    "singular": "pound"
  },
  "to_unit": {
    "symbol": "kg",
    "display": "kg",
    "name": "kilograms",
    "singular": "kilogram"
  },
  "linear": true,
  "factor": 0.45359237,
  "inverse_factor": 2.204622622,
  "formula": "kilograms = pounds × 0.45359237",
  "reverse_formula": "pounds = kilograms × 2.204622622",
  "unit_relation": "1 lb = 0.453592 kg",
  "examples": [
    {
      "value": 5,
      "result": 2.26796,
      "text": "5 lb = 2.26796 kg"
    },
    {
      "value": 12.5,
      "result": 5.6699,
      "text": "12.5 lb = 5.6699 kg"
    },
    {
      "value": 100,
      "result": 45.3592,
      "text": "100 lb = 45.3592 kg"
    }
  ],
  "table": [
    {
      "lb": 1,
      "kg": 0.453592
    },
    {
      "lb": 2,
      "kg": 0.907185
    },
    {
      "lb": 3,
      "kg": 1.36078
    },
    {
      "lb": 4,
      "kg": 1.81437
    },
    {
      "lb": 5,
      "kg": 2.26796
    },
    {
      "lb": 6,
      "kg": 2.72155
    },
    {
      "lb": 7,
      "kg": 3.17515
    },
    {
      "lb": 8,
      "kg": 3.62874
    },
    {
      "lb": 9,
      "kg": 4.08233
    },
    {
      "lb": 10,
      "kg": 4.53592
    },
    {
      "lb": 15,
      "kg": 6.80389
    },
    {
      "lb": 20,
      "kg": 9.07185
    },
    {
      "lb": 25,
      "kg": 11.3398
    },
    {
      "lb": 30,
      "kg": 13.6078
    },
    {
      "lb": 40,
      "kg": 18.1437
    },
    {
      "lb": 50,
      "kg": 22.6796
    },
    {
      "lb": 75,
      "kg": 34.0194
    },
    {
      "lb": 100,
      "kg": 45.3592
    },
    {
      "lb": 200,
      "kg": 90.7185
    },
    {
      "lb": 250,
      "kg": 113.398
    },
    {
      "lb": 500,
      "kg": 226.796
    },
    {
      "lb": 1000,
      "kg": 453.592
    }
  ],
  "faq": [
    {
      "q": "How many kilograms are in one pound?",
      "a": "1 lb = 0.453592 kg. 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 pounds to kilograms?",
      "a": "Multiply the value in pounds by 0.45359237: kilograms = pounds × 0.45359237. For example, 5 lb = 2.26796 kg."
    },
    {
      "q": "How do I convert kilograms back to pounds?",
      "a": "Multiply by the inverse factor 2.204622622 (pounds = kilograms × 2.204622622), or use the kilograms-to-pounds 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=lb&to_unit=kg",
    "calculator": "https://tttkmbb.com/api/v1/calculate/mass?value=5&from_unit=lb&to_unit=kg",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "lb",
      "to_unit": "kg"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/lbs-to-kg",
    "markdown": "https://tttkmbb.com/conversion/lbs-to-kg.md",
    "json": "https://tttkmbb.com/conversion/lbs-to-kg.json",
    "reverse": "https://tttkmbb.com/conversion/kg-to-lbs",
    "quantity_converter": "https://tttkmbb.com/conversion/mass",
    "units": "https://tttkmbb.com/api/v1/units?quantity=mass"
  },
  "timestamp": "2026-09-24"
}