1 TSP = how many grams?

The object being measured needs to be known to answer the question, as a teaspoon is a unit of volume and grams are a unit of mass. If we are to assume water, that is at sea level and 39.2 degrees F, then 1 cubic centimeter of water equals 1 gram. Since 1 teaspoon has 4.929 cubic centimeters, that means 1 teaspoon weighs 4.929 grams.

Monday, February 06 2012
Source: http://ga.water.usgs.gov/edu/waterproperties.html