Weight of 1 milliliter (ml) of pure water at temperature 4 °C = 1 gram (g). 1 US tablespoon (tbsp) = 14.7867648 grams (g) of water = 14.7867648 milliliters (mL) = 0.5 US fluid ounce (fl. oz.) = 3 US teaspoons (tsp). The tablespoon is rounded to precisely 15 mL by US federal regulations (FDA) for food labeling purposes.