{
  "id": "47-lbs-to-kg",
  "version": "573759bcc756",
  "status": "published",
  "name": "47 lbs to kg",
  "question": "What is 47 lbs to kg?",
  "summary": "Converts pounds (lb) to kilograms (kg) and back, with the exact unit definitions.",
  "category": "convert",
  "subcategory": "weight",
  "url": "https://www.acalculator.org/convert/47-lbs-to-kg",
  "markdown": "https://www.acalculator.org/convert/47-lbs-to-kg.md",
  "kind": "formulas",
  "method": "kg = lb × 0.45359237",
  "assumptions": [
    "1 pound = 0.45359237 kilograms, from the exact definitions in NIST SP 811.",
    "Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up; an answer of 1 billion or more shows at most 15 significant digits."
  ],
  "inputs": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "value": {
        "title": "Pounds (lb)",
        "description": "The amount in pounds to convert.",
        "type": "number",
        "minimum": 0,
        "maximum": 1000000000000
      },
      "result": {
        "title": "Kilograms (kg)",
        "description": "The same amount in kilograms.",
        "type": "number",
        "minimum": 0,
        "maximum": 453592370000
      }
    }
  },
  "solve": {
    "fillAny": 1,
    "variables": [
      "value",
      "result"
    ],
    "inputsOnly": []
  },
  "outputs": {
    "value": {
      "label": "Pounds (lb)",
      "description": "The amount in pounds to convert.",
      "format": "number"
    },
    "result": {
      "label": "Kilograms (kg)",
      "description": "The amount in kilograms.",
      "format": "number"
    }
  },
  "defaultAnswer": {
    "inputs": {
      "value": 47
    },
    "outputs": {
      "result": 21.31884139
    },
    "text": "47 lb = 21.318841 kg."
  },
  "examples": [
    {
      "given": {
        "value": 1
      },
      "expect": {
        "result": 0.45359237
      },
      "source": "exact unit definitions in NIST SP 811 (2008), Appendix B.8"
    },
    {
      "given": {
        "value": 150
      },
      "expect": {
        "result": 68.0388555
      },
      "source": "exact unit definitions in NIST SP 811 (2008), Appendix B.8"
    },
    {
      "given": {
        "result": 70
      },
      "expect": {
        "value": 154.3235835294143
      },
      "source": "exact unit definitions in NIST SP 811 (2008), Appendix B.8"
    }
  ],
  "sources": [
    "NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B.8: Factors for Units Listed Alphabetically (bold factors are exact), retrieved 2026-10-18. https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8",
    "NIST SP 811 (2008), footnotes to Appendix B: 1 lb = 0.45359237 kg exactly (footnote 22); 1 lbf = 4.4482216152605 N exactly with standard gravity, 9.80665 m/s² (footnote 23), retrieved 2026-10-18. https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes"
  ],
  "related": [
    "lbs-to-kg",
    "46-lbs-to-kg",
    "48-lbs-to-kg",
    "kg-to-lbs"
  ],
  "changelog": []
}