One teaspoon of water is equal to 5 grams, and 1 tablespoon of water is approximately equivalent to 15 grams. However, grams are used to measure weight, whereas teaspoons and tablespoons measure volume, so these conversions are not applicable to different ingredients.
Some cultures use ingredient weight such as grams and kilograms in recipes, while others, such as the United States, rely on volume measurements such as cups, teaspoons and tablespoons. Due to variations in density of ingredients, many people view weight to be a more accurate method. Many cookbooks and recipes provide both weight and volume measurements, and home cooks can weigh their ingredients with a small kitchen scale.