When converting metric to United States customary units, 1 milliliter converts to 13/64 of a teaspoon, which is slightly less than 1/4 teaspoon. An exact conversion of 1/4 teaspoon to milliliters is 1.23 milliliters.
Being able to convert metric measurements in recipes is extremely important, especially for specific recipes for baking. Examples of when this is necessary would be when working with recipes from countries that use the metric system, such as Great Britain.
The United States is the largest nation in the world that does not use the metric system as its common standard of measurement. In fact, only two other nations, Liberia and Myanmar, do not use the metric system. As of 2013, the metric system was slowly being adopted in both of these nations as well.