Teaspoon to Milliliter Converter (tsp to mL)
1 teaspoon equals 4.928922 milliliters (mL) — multiply teaspoons by 4.928922 to convert. This is the exact US customary teaspoon. (A metric teaspoon is 5 mL, but the US definition of 4.928922 mL is used here.) It is one of the most common kitchen and medicine conversions.
The formula
Multiply teaspoons by the factor to get milliliters:
milliliters = teaspoons × 4.928922For example, 2 tsp × 4.928922 = 9.857844 mL. To reverse, divide by 4.928922 (or multiply mL by 0.20288414).
Conversion table
| Teaspoons (tsp) | Milliliters (mL) |
|---|---|
| 1 | 4.928922 |
| 2 | 9.857844 |
| 5 | 24.644608 |
| 10 | 49.289216 |
| 25 | 123.223040 |
| 50 | 246.446080 |
| 100 | 492.892159 |
| 500 | 2,464.460796 |
| 1000 | 4,928.921593 |
How to convert online
- Type the number of teaspoons into the first box.
- Read the equivalent milliliter value instantly in the second box.
- Type a milliliter value to convert back to teaspoons — it works both ways.
Use the Teaspoon to Milliliter Converter — free and instant in your browser.
Where this conversion is used
This conversion is everywhere: measuring liquid medicine doses, following metric recipes with US spoons, mixing supplements, and lab work. Because milliliters are precise and universal, converting teaspoons to mL removes guesswork when accuracy matters.
FAQ
How many mL are in a teaspoon?
A US teaspoon is 4.928922 mL. Many everyday references round this to 5 mL.
What is the formula to convert teaspoons to milliliters?
Multiply the teaspoon value by 4.928922. In symbols, mL = tsp × 4.928922.
How do I convert milliliters back to teaspoons?
Divide mL by 4.928922, or multiply by 0.20288414. So 10 mL ≈ 2.028841 tsp.
Is a teaspoon exactly 5 mL?
No — the US teaspoon is 4.928922 mL. The 5 mL figure is the metric teaspoon used for dosing convenience.
Related converters
- Milliliter to Teaspoon Converter
- Teaspoon to Tablespoon Converter
- Teaspoon to Liter Converter
- Teaspoon to Cup Converter
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