{
  "entity_type": "unit_conversion_page",
  "id": "calories-to-kcal",
  "name": "Calories (small, thermochemical) to Kilocalories (food calories)",
  "title": "Calories (small, thermochemical) to Kilocalories (food calories) Converter (cal to kcal)",
  "description": "Convert calories (small, thermochemical) to kilocalories (food calories): 1 cal = 0.001 kcal. 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": "cal",
    "display": "cal",
    "name": "calories (small, thermochemical)",
    "singular": "calorie"
  },
  "to_unit": {
    "symbol": "kcal",
    "display": "kcal",
    "name": "kilocalories (food calories)",
    "singular": "kilocalorie"
  },
  "linear": true,
  "factor": 0.001,
  "inverse_factor": 1000,
  "formula": "kilocalories (food calories) = calories (small, thermochemical) × 0.001",
  "reverse_formula": "calories (small, thermochemical) = kilocalories (food calories) × 1000",
  "unit_relation": "1 cal = 0.001 kcal",
  "examples": [
    {
      "value": 5,
      "result": 0.005,
      "text": "5 cal = 0.005 kcal"
    },
    {
      "value": 12.5,
      "result": 0.0125,
      "text": "12.5 cal = 0.0125 kcal"
    },
    {
      "value": 100,
      "result": 0.1,
      "text": "100 cal = 0.1 kcal"
    }
  ],
  "table": [
    {
      "cal": 1,
      "kcal": 0.001
    },
    {
      "cal": 2,
      "kcal": 0.002
    },
    {
      "cal": 3,
      "kcal": 0.003
    },
    {
      "cal": 4,
      "kcal": 0.004
    },
    {
      "cal": 5,
      "kcal": 0.005
    },
    {
      "cal": 6,
      "kcal": 0.006
    },
    {
      "cal": 7,
      "kcal": 0.007
    },
    {
      "cal": 8,
      "kcal": 0.008
    },
    {
      "cal": 9,
      "kcal": 0.009
    },
    {
      "cal": 10,
      "kcal": 0.01
    },
    {
      "cal": 15,
      "kcal": 0.015
    },
    {
      "cal": 20,
      "kcal": 0.02
    },
    {
      "cal": 25,
      "kcal": 0.025
    },
    {
      "cal": 30,
      "kcal": 0.03
    },
    {
      "cal": 40,
      "kcal": 0.04
    },
    {
      "cal": 50,
      "kcal": 0.05
    },
    {
      "cal": 75,
      "kcal": 0.075
    },
    {
      "cal": 100,
      "kcal": 0.1
    },
    {
      "cal": 200,
      "kcal": 0.2
    },
    {
      "cal": 250,
      "kcal": 0.25
    },
    {
      "cal": 500,
      "kcal": 0.5
    },
    {
      "cal": 1000,
      "kcal": 1
    }
  ],
  "faq": [
    {
      "q": "How many kilocalories (food calories) are in one calorie?",
      "a": "1 cal = 0.001 kcal. 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 calories (small, thermochemical) to kilocalories (food calories)?",
      "a": "Multiply the value in calories (small, thermochemical) by 0.001: kilocalories (food calories) = calories (small, thermochemical) × 0.001. For example, 5 cal = 0.005 kcal."
    },
    {
      "q": "How do I convert kilocalories (food calories) back to calories (small, thermochemical)?",
      "a": "Multiply by the inverse factor 1000 (calories (small, thermochemical) = kilocalories (food calories) × 1000), or use the kilocalories (food calories)-to-calories (small, thermochemical) 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=cal&to_unit=kcal",
    "calculator": "https://tttkmbb.com/api/v1/calculate/energy?value=5&from_unit=cal&to_unit=kcal",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "cal",
      "to_unit": "kcal"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/calories-to-kcal",
    "markdown": "https://tttkmbb.com/conversion/calories-to-kcal.md",
    "json": "https://tttkmbb.com/conversion/calories-to-kcal.json",
    "reverse": "https://tttkmbb.com/conversion/kcal-to-calories",
    "quantity_converter": "https://tttkmbb.com/conversion/energy",
    "units": "https://tttkmbb.com/api/v1/units?quantity=energy"
  },
  "timestamp": "2026-09-24"
}