{
  "entity_type": "unit_conversion_page",
  "id": "mpa-to-psi",
  "name": "Megapascals to Psi",
  "title": "Megapascals to Psi Converter (MPa to psi)",
  "description": "Convert megapascals to psi: 1 MPa = 145.038 psi. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.",
  "quantity": "pressure",
  "quantity_name": "Pressure",
  "base_unit": "Pa",
  "from_unit": {
    "symbol": "MPa",
    "display": "MPa",
    "name": "megapascals",
    "singular": "megapascal"
  },
  "to_unit": {
    "symbol": "psi",
    "display": "psi",
    "name": "psi",
    "singular": "psi"
  },
  "linear": true,
  "factor": 145.0377377,
  "inverse_factor": 0.006894757293,
  "formula": "psi = megapascals × 145.0377377",
  "reverse_formula": "megapascals = psi × 0.006894757293",
  "unit_relation": "1 MPa = 145.038 psi",
  "examples": [
    {
      "value": 5,
      "result": 725.189,
      "text": "5 MPa = 725.189 psi"
    },
    {
      "value": 12.5,
      "result": 1812.97,
      "text": "12.5 MPa = 1812.97 psi"
    },
    {
      "value": 100,
      "result": 14503.8,
      "text": "100 MPa = 14503.8 psi"
    }
  ],
  "table": [
    {
      "MPa": 1,
      "psi": 145.038
    },
    {
      "MPa": 2,
      "psi": 290.075
    },
    {
      "MPa": 3,
      "psi": 435.113
    },
    {
      "MPa": 4,
      "psi": 580.151
    },
    {
      "MPa": 5,
      "psi": 725.189
    },
    {
      "MPa": 6,
      "psi": 870.226
    },
    {
      "MPa": 7,
      "psi": 1015.26
    },
    {
      "MPa": 8,
      "psi": 1160.3
    },
    {
      "MPa": 9,
      "psi": 1305.34
    },
    {
      "MPa": 10,
      "psi": 1450.38
    },
    {
      "MPa": 15,
      "psi": 2175.57
    },
    {
      "MPa": 20,
      "psi": 2900.75
    },
    {
      "MPa": 25,
      "psi": 3625.94
    },
    {
      "MPa": 30,
      "psi": 4351.13
    },
    {
      "MPa": 40,
      "psi": 5801.51
    },
    {
      "MPa": 50,
      "psi": 7251.89
    },
    {
      "MPa": 75,
      "psi": 10877.8
    },
    {
      "MPa": 100,
      "psi": 14503.8
    },
    {
      "MPa": 200,
      "psi": 29007.5
    },
    {
      "MPa": 250,
      "psi": 36259.4
    },
    {
      "MPa": 500,
      "psi": 72518.9
    },
    {
      "MPa": 1000,
      "psi": 145038
    }
  ],
  "faq": [
    {
      "q": "How many psi are in one megapascal?",
      "a": "1 MPa = 145.038 psi. 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 megapascals to psi?",
      "a": "Multiply the value in megapascals by 145.0377377: psi = megapascals × 145.0377377. For example, 5 MPa = 725.189 psi."
    },
    {
      "q": "How do I convert psi back to megapascals?",
      "a": "Multiply by the inverse factor 0.006894757293 (megapascals = psi × 0.006894757293), or use the psi-to-megapascals 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=MPa&to_unit=psi",
    "calculator": "https://tttkmbb.com/api/v1/calculate/pressure?value=5&from_unit=MPa&to_unit=psi",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "MPa",
      "to_unit": "psi"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/mpa-to-psi",
    "markdown": "https://tttkmbb.com/conversion/mpa-to-psi.md",
    "json": "https://tttkmbb.com/conversion/mpa-to-psi.json",
    "reverse": "https://tttkmbb.com/conversion/psi-to-mpa",
    "quantity_converter": "https://tttkmbb.com/conversion/pressure",
    "units": "https://tttkmbb.com/api/v1/units?quantity=pressure"
  },
  "timestamp": "2026-09-24"
}