Convert from Teaspoon [US] to milliliter

Unit Definition (Teaspoon [US])
The teaspoon is a unit of volume used in food recipes. The U.S. teaspoon is equal to 1/3 tablespoon or 1/48 cup; this is equivalent to 1/6 fluid ounce, about 0.30 cubic inches, or approximately 4.9 milliliters.

Unit Definition (milliliter)
The milliliter is a very common metric unit of volume. One milliliter equals 0.001 liter, exactly one cubic centimeter (cm³ or cc), or approximately 0.061 023 7 cubic inch or 16.231 U.S. minims. The milliliter is used almost entirely for measuring the volumes of liquids, with solids being measured in cubic centimeters.