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Volume
Teaspoons to Milliliters
Convert teaspoons (tsp) to milliliters (mL). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 tsp = 4.9289 mL
Teaspoons to Milliliters Conversion Table
Common values, ready to copy:
| teaspoons | milliliters |
|---|---|
| 1 tsp | 4.9289 mL |
| 2 tsp | 9.8578 mL |
| 5 tsp | 24.6446 mL |
| 10 tsp | 49.2892 mL |
| 25 tsp | 123.22 mL |
| 50 tsp | 246.45 mL |
| 100 tsp | 492.89 mL |
| 1,000 tsp | 4928.92 mL |
Formula
milliliters = teaspoons × 4.92892
Volume conversions use US customary measure (the cup, fluid ounce, and gallon are US definitions, not imperial). 1 US cup = 236.588 mL, 1 US gallon = 3.785411784 L.
About Teaspoons and Milliliters
Teaspoons (tsp): Standardized at about 5 mL for cooking purposes; US legal definition is exactly 4.92892 mL, but international cooking convention uses 5 mL even in the US. Common uses: Small cooking measurements (spices, baking powder, vanilla extract), liquid medication dosing for adults (often 1 or 2 teaspoons = 5 or 10 mL).
Milliliters (mL): One thousandth of a liter, where the liter is defined as one cubic decimeter; not strictly an SI unit (the SI volume unit is the cubic meter) but universal in cooking, medicine, and chemistry. Common uses: Liquid medication dosing, lab work, cooking (especially in metric countries), bartending, and any small-volume liquid measurement.
How the conversion works
Volume conversions use US customary measure (the cup, fluid ounce, and gallon are US definitions, not imperial). 1 US cup = 236.588 mL, 1 US gallon = 3.785411784 L.
The exact relationship is milliliters = teaspoons × 4.92892, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between teaspoons and milliliters comes up wherever volume measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.