According to the Southern Food Expert of About.com, one gram equals .21 teaspoons. Conversely, this means one teaspoon equals approximately 4.76 grams when you need to compare.
Teaspoons and grams focus on two different types of measurement, so comparison of the two becomes difficult. Teaspoons measure volume, the amount of space something takes up. However, grams measure weight. This means this method of conversion of teaspoons to grams does not work with every form of volume and teaspoons. When making such conversions, you must consider the specific items you want to convert in order to get a more accurate measurement.