{
  "entity_type": "unit_conversion_page",
  "id": "micrometers-to-mm",
  "name": "Micrometers to Millimeters",
  "title": "Micrometers to Millimeters Converter (μm to mm)",
  "description": "Convert micrometers to millimeters: 1 μm = 0.001 mm. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.",
  "quantity": "length",
  "quantity_name": "Length",
  "base_unit": "m",
  "from_unit": {
    "symbol": "um",
    "display": "μm",
    "name": "micrometers",
    "singular": "micrometer"
  },
  "to_unit": {
    "symbol": "mm",
    "display": "mm",
    "name": "millimeters",
    "singular": "millimeter"
  },
  "linear": true,
  "factor": 0.001,
  "inverse_factor": 1000,
  "formula": "millimeters = micrometers × 0.001",
  "reverse_formula": "micrometers = millimeters × 1000",
  "unit_relation": "1 μm = 0.001 mm",
  "examples": [
    {
      "value": 5,
      "result": 0.005,
      "text": "5 μm = 0.005 mm"
    },
    {
      "value": 12.5,
      "result": 0.0125,
      "text": "12.5 μm = 0.0125 mm"
    },
    {
      "value": 100,
      "result": 0.1,
      "text": "100 μm = 0.1 mm"
    }
  ],
  "table": [
    {
      "um": 1,
      "mm": 0.001
    },
    {
      "um": 2,
      "mm": 0.002
    },
    {
      "um": 3,
      "mm": 0.003
    },
    {
      "um": 4,
      "mm": 0.004
    },
    {
      "um": 5,
      "mm": 0.005
    },
    {
      "um": 6,
      "mm": 0.006
    },
    {
      "um": 7,
      "mm": 0.007
    },
    {
      "um": 8,
      "mm": 0.008
    },
    {
      "um": 9,
      "mm": 0.009
    },
    {
      "um": 10,
      "mm": 0.01
    },
    {
      "um": 15,
      "mm": 0.015
    },
    {
      "um": 20,
      "mm": 0.02
    },
    {
      "um": 25,
      "mm": 0.025
    },
    {
      "um": 30,
      "mm": 0.03
    },
    {
      "um": 40,
      "mm": 0.04
    },
    {
      "um": 50,
      "mm": 0.05
    },
    {
      "um": 75,
      "mm": 0.075
    },
    {
      "um": 100,
      "mm": 0.1
    },
    {
      "um": 200,
      "mm": 0.2
    },
    {
      "um": 250,
      "mm": 0.25
    },
    {
      "um": 500,
      "mm": 0.5
    },
    {
      "um": 1000,
      "mm": 1
    }
  ],
  "faq": [
    {
      "q": "How many millimeters are in one micrometer?",
      "a": "1 μm = 0.001 mm. 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 micrometers to millimeters?",
      "a": "Multiply the value in micrometers by 0.001: millimeters = micrometers × 0.001. For example, 5 μm = 0.005 mm."
    },
    {
      "q": "How do I convert millimeters back to micrometers?",
      "a": "Multiply by the inverse factor 1000 (micrometers = millimeters × 1000), or use the millimeters-to-micrometers 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=um&to_unit=mm",
    "calculator": "https://tttkmbb.com/api/v1/calculate/length?value=5&from_unit=um&to_unit=mm",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "um",
      "to_unit": "mm"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/micrometers-to-mm",
    "markdown": "https://tttkmbb.com/conversion/micrometers-to-mm.md",
    "json": "https://tttkmbb.com/conversion/micrometers-to-mm.json",
    "reverse": "https://tttkmbb.com/conversion/mm-to-micrometers",
    "quantity_converter": "https://tttkmbb.com/conversion/length",
    "units": "https://tttkmbb.com/api/v1/units?quantity=length"
  },
  "timestamp": "2026-09-24"
}