{
  "id": "teaspoons-to-ml",
  "version": "388265b3c203",
  "status": "published",
  "name": "Teaspoons to Ml Converter",
  "question": "How do I convert teaspoons to ml?",
  "summary": "Converts teaspoons (tsp) to milliliters (mL) and back, with the exact unit definitions.",
  "category": "convert",
  "subcategory": "cooking",
  "url": "https://www.acalculator.org/convert/teaspoons-to-ml",
  "markdown": "https://www.acalculator.org/convert/teaspoons-to-ml.md",
  "kind": "formulas",
  "method": "mL = tsp × 4.92892159375",
  "assumptions": [
    "1 teaspoon = 4.92892159375 milliliters, from the exact definitions in NIST SP 811.",
    "Cups, ounces, tablespoons, teaspoons, pints, quarts, and gallons are US customary units: 1 US cup is 8 US fluid ounces.",
    "Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up; an answer of 1 billion or more shows at most 15 significant digits."
  ],
  "inputs": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "value": {
        "title": "Teaspoons (tsp)",
        "description": "The amount in teaspoons to convert.",
        "type": "number",
        "minimum": 0,
        "maximum": 1000000000000
      },
      "result": {
        "title": "Milliliters (mL)",
        "description": "The same amount in milliliters.",
        "type": "number",
        "minimum": 0,
        "maximum": 4928921593750
      }
    }
  },
  "solve": {
    "fillAny": 1,
    "variables": [
      "value",
      "result"
    ],
    "inputsOnly": []
  },
  "outputs": {
    "value": {
      "label": "Teaspoons (tsp)",
      "description": "The amount in teaspoons to convert.",
      "format": "number"
    },
    "result": {
      "label": "Milliliters (mL)",
      "description": "The amount in milliliters.",
      "format": "number"
    }
  },
  "defaultAnswer": {
    "inputs": {
      "value": 1
    },
    "outputs": {
      "result": 4.92892159375
    },
    "text": "1 tsp = 4.928922 mL."
  },
  "examples": [
    {
      "given": {
        "value": 1
      },
      "expect": {
        "result": 4.92892159375
      },
      "source": "exact unit definitions in NIST SP 811 (2008), Appendix B.8"
    },
    {
      "given": {
        "value": 3
      },
      "expect": {
        "result": 14.78676478125
      },
      "source": "exact unit definitions in NIST SP 811 (2008), Appendix B.8"
    },
    {
      "given": {
        "result": 14.78676478125
      },
      "expect": {
        "value": 3
      },
      "source": "exact unit definitions in NIST SP 811 (2008), Appendix B.8"
    }
  ],
  "sources": [
    "NIST Office of Weights and Measures, Metric Household: 1 teaspoon = 1/3 tablespoon = 1/6 fluid ounce, 1 tablespoon = 1/2 fluid ounce, 1 cup = 8 fluid ounces (exact), retrieved 2026-10-18. https://www.nist.gov/pml/owm/metric-household",
    "NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B.8: Factors for Units Listed Alphabetically (bold factors are exact), retrieved 2026-10-18. https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8",
    "NIST Office of Weights and Measures, Metric Kitchen: Cooking Measurement Equivalencies (approximate: 1 teaspoon = 5 mL, 1 tablespoon = 15 mL), retrieved 2026-10-18. https://www.nist.gov/pml/owm/metric-si/metric-kitchen/metric-kitchen-cooking-measurement-equivalencies"
  ],
  "related": [
    "ml-to-oz",
    "ml-to-cups",
    "cups-to-ml",
    "teaspoons-to-cups",
    "teaspoons-to-tablespoons"
  ],
  "changelog": []
}