{
  "entity_type": "unit_conversion_page",
  "id": "ml-to-teaspoons",
  "name": "Milliliters to US teaspoons",
  "title": "Milliliters to US teaspoons Converter (mL to tsp)",
  "description": "Convert milliliters to US teaspoons: 1 mL = 0.202884 tsp. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.",
  "quantity": "volume",
  "quantity_name": "Volume",
  "base_unit": "L",
  "from_unit": {
    "symbol": "mL",
    "display": "mL",
    "name": "milliliters",
    "singular": "milliliter"
  },
  "to_unit": {
    "symbol": "tsp",
    "display": "tsp",
    "name": "US teaspoons",
    "singular": "teaspoon"
  },
  "linear": true,
  "factor": 0.2028841362,
  "inverse_factor": 4.928921594,
  "formula": "US teaspoons = milliliters × 0.2028841362",
  "reverse_formula": "milliliters = US teaspoons × 4.928921594",
  "unit_relation": "1 mL = 0.202884 tsp",
  "examples": [
    {
      "value": 5,
      "result": 1.01442,
      "text": "5 mL = 1.01442 tsp"
    },
    {
      "value": 12.5,
      "result": 2.53605,
      "text": "12.5 mL = 2.53605 tsp"
    },
    {
      "value": 100,
      "result": 20.2884,
      "text": "100 mL = 20.2884 tsp"
    }
  ],
  "table": [
    {
      "mL": 1,
      "tsp": 0.202884
    },
    {
      "mL": 2,
      "tsp": 0.405768
    },
    {
      "mL": 3,
      "tsp": 0.608652
    },
    {
      "mL": 4,
      "tsp": 0.811537
    },
    {
      "mL": 5,
      "tsp": 1.01442
    },
    {
      "mL": 6,
      "tsp": 1.2173
    },
    {
      "mL": 7,
      "tsp": 1.42019
    },
    {
      "mL": 8,
      "tsp": 1.62307
    },
    {
      "mL": 9,
      "tsp": 1.82596
    },
    {
      "mL": 10,
      "tsp": 2.02884
    },
    {
      "mL": 15,
      "tsp": 3.04326
    },
    {
      "mL": 20,
      "tsp": 4.05768
    },
    {
      "mL": 25,
      "tsp": 5.0721
    },
    {
      "mL": 30,
      "tsp": 6.08652
    },
    {
      "mL": 40,
      "tsp": 8.11537
    },
    {
      "mL": 50,
      "tsp": 10.1442
    },
    {
      "mL": 75,
      "tsp": 15.2163
    },
    {
      "mL": 100,
      "tsp": 20.2884
    },
    {
      "mL": 200,
      "tsp": 40.5768
    },
    {
      "mL": 250,
      "tsp": 50.721
    },
    {
      "mL": 500,
      "tsp": 101.442
    },
    {
      "mL": 1000,
      "tsp": 202.884
    }
  ],
  "faq": [
    {
      "q": "How many US teaspoons are in one milliliter?",
      "a": "1 mL = 0.202884 tsp. 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 milliliters to US teaspoons?",
      "a": "Multiply the value in milliliters by 0.2028841362: US teaspoons = milliliters × 0.2028841362. For example, 5 mL = 1.01442 tsp."
    },
    {
      "q": "How do I convert US teaspoons back to milliliters?",
      "a": "Multiply by the inverse factor 4.928921594 (milliliters = US teaspoons × 4.928921594), or use the US teaspoons-to-milliliters 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=mL&to_unit=tsp",
    "calculator": "https://tttkmbb.com/api/v1/calculate/volume?value=5&from_unit=mL&to_unit=tsp",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "mL",
      "to_unit": "tsp"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/ml-to-teaspoons",
    "markdown": "https://tttkmbb.com/conversion/ml-to-teaspoons.md",
    "json": "https://tttkmbb.com/conversion/ml-to-teaspoons.json",
    "reverse": "https://tttkmbb.com/conversion/teaspoons-to-ml",
    "quantity_converter": "https://tttkmbb.com/conversion/volume",
    "units": "https://tttkmbb.com/api/v1/units?quantity=volume"
  },
  "timestamp": "2026-09-24"
}