{
  "entity_type": "unit_conversion_page",
  "id": "teaspoons-to-ml",
  "name": "US teaspoons to Milliliters",
  "title": "US teaspoons to Milliliters Converter (tsp to mL)",
  "description": "Convert US teaspoons to milliliters: 1 tsp = 4.92892 mL. 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": "tsp",
    "display": "tsp",
    "name": "US teaspoons",
    "singular": "teaspoon"
  },
  "to_unit": {
    "symbol": "mL",
    "display": "mL",
    "name": "milliliters",
    "singular": "milliliter"
  },
  "linear": true,
  "factor": 4.928921594,
  "inverse_factor": 0.2028841362,
  "formula": "milliliters = US teaspoons × 4.928921594",
  "reverse_formula": "US teaspoons = milliliters × 0.2028841362",
  "unit_relation": "1 tsp = 4.92892 mL",
  "examples": [
    {
      "value": 5,
      "result": 24.6446,
      "text": "5 tsp = 24.6446 mL"
    },
    {
      "value": 12.5,
      "result": 61.6115,
      "text": "12.5 tsp = 61.6115 mL"
    },
    {
      "value": 100,
      "result": 492.892,
      "text": "100 tsp = 492.892 mL"
    }
  ],
  "table": [
    {
      "tsp": 1,
      "mL": 4.92892
    },
    {
      "tsp": 2,
      "mL": 9.85784
    },
    {
      "tsp": 3,
      "mL": 14.7868
    },
    {
      "tsp": 4,
      "mL": 19.7157
    },
    {
      "tsp": 5,
      "mL": 24.6446
    },
    {
      "tsp": 6,
      "mL": 29.5735
    },
    {
      "tsp": 7,
      "mL": 34.5025
    },
    {
      "tsp": 8,
      "mL": 39.4314
    },
    {
      "tsp": 9,
      "mL": 44.3603
    },
    {
      "tsp": 10,
      "mL": 49.2892
    },
    {
      "tsp": 15,
      "mL": 73.9338
    },
    {
      "tsp": 20,
      "mL": 98.5784
    },
    {
      "tsp": 25,
      "mL": 123.223
    },
    {
      "tsp": 30,
      "mL": 147.868
    },
    {
      "tsp": 40,
      "mL": 197.157
    },
    {
      "tsp": 50,
      "mL": 246.446
    },
    {
      "tsp": 75,
      "mL": 369.669
    },
    {
      "tsp": 100,
      "mL": 492.892
    },
    {
      "tsp": 200,
      "mL": 985.784
    },
    {
      "tsp": 250,
      "mL": 1232.23
    },
    {
      "tsp": 500,
      "mL": 2464.46
    },
    {
      "tsp": 1000,
      "mL": 4928.92
    }
  ],
  "faq": [
    {
      "q": "How many milliliters are in one teaspoon?",
      "a": "1 tsp = 4.92892 mL. 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 US teaspoons to milliliters?",
      "a": "Multiply the value in US teaspoons by 4.928921594: milliliters = US teaspoons × 4.928921594. For example, 5 tsp = 24.6446 mL."
    },
    {
      "q": "How do I convert milliliters back to US teaspoons?",
      "a": "Multiply by the inverse factor 0.2028841362 (US teaspoons = milliliters × 0.2028841362), or use the milliliters-to-US teaspoons 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=tsp&to_unit=mL",
    "calculator": "https://tttkmbb.com/api/v1/calculate/volume?value=5&from_unit=tsp&to_unit=mL",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "tsp",
      "to_unit": "mL"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/teaspoons-to-ml",
    "markdown": "https://tttkmbb.com/conversion/teaspoons-to-ml.md",
    "json": "https://tttkmbb.com/conversion/teaspoons-to-ml.json",
    "reverse": "https://tttkmbb.com/conversion/ml-to-teaspoons",
    "quantity_converter": "https://tttkmbb.com/conversion/volume",
    "units": "https://tttkmbb.com/api/v1/units?quantity=volume"
  },
  "timestamp": "2026-09-24"
}