{
  "entity_type": "unit_conversion_page",
  "id": "stone-to-lbs",
  "name": "Stone to Pounds",
  "title": "Stone to Pounds Converter (st to lb)",
  "description": "Convert stone to pounds: 1 st = 14 lb. 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": "st",
    "display": "st",
    "name": "stone",
    "singular": "stone"
  },
  "to_unit": {
    "symbol": "lb",
    "display": "lb",
    "name": "pounds",
    "singular": "pound"
  },
  "linear": true,
  "factor": 14,
  "inverse_factor": 0.07142857143,
  "formula": "pounds = stone × 14",
  "reverse_formula": "stone = pounds × 0.07142857143",
  "unit_relation": "1 st = 14 lb",
  "examples": [
    {
      "value": 5,
      "result": 70,
      "text": "5 st = 70 lb"
    },
    {
      "value": 12.5,
      "result": 175,
      "text": "12.5 st = 175 lb"
    },
    {
      "value": 100,
      "result": 1400,
      "text": "100 st = 1400 lb"
    }
  ],
  "table": [
    {
      "st": 1,
      "lb": 14
    },
    {
      "st": 2,
      "lb": 28
    },
    {
      "st": 3,
      "lb": 42
    },
    {
      "st": 4,
      "lb": 56
    },
    {
      "st": 5,
      "lb": 70
    },
    {
      "st": 6,
      "lb": 84
    },
    {
      "st": 7,
      "lb": 98
    },
    {
      "st": 8,
      "lb": 112
    },
    {
      "st": 9,
      "lb": 126
    },
    {
      "st": 10,
      "lb": 140
    },
    {
      "st": 15,
      "lb": 210
    },
    {
      "st": 20,
      "lb": 280
    },
    {
      "st": 25,
      "lb": 350
    },
    {
      "st": 30,
      "lb": 420
    },
    {
      "st": 40,
      "lb": 560
    },
    {
      "st": 50,
      "lb": 700
    },
    {
      "st": 75,
      "lb": 1050
    },
    {
      "st": 100,
      "lb": 1400
    },
    {
      "st": 200,
      "lb": 2800
    },
    {
      "st": 250,
      "lb": 3500
    },
    {
      "st": 500,
      "lb": 7000
    },
    {
      "st": 1000,
      "lb": 14000
    }
  ],
  "faq": [
    {
      "q": "How many pounds are in one stone?",
      "a": "1 st = 14 lb. 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 stone to pounds?",
      "a": "Multiply the value in stone by 14: pounds = stone × 14. For example, 5 st = 70 lb."
    },
    {
      "q": "How do I convert pounds back to stone?",
      "a": "Multiply by the inverse factor 0.07142857143 (stone = pounds × 0.07142857143), or use the pounds-to-stone 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=st&to_unit=lb",
    "calculator": "https://tttkmbb.com/api/v1/calculate/mass?value=5&from_unit=st&to_unit=lb",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "st",
      "to_unit": "lb"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/stone-to-lbs",
    "markdown": "https://tttkmbb.com/conversion/stone-to-lbs.md",
    "json": "https://tttkmbb.com/conversion/stone-to-lbs.json",
    "reverse": "https://tttkmbb.com/conversion/lbs-to-stone",
    "quantity_converter": "https://tttkmbb.com/conversion/mass",
    "units": "https://tttkmbb.com/api/v1/units?quantity=mass"
  },
  "timestamp": "2026-09-24"
}