how many ml are in one teaspoon
1 Teaspoon [US] = 4.92892159 Milliliters. Teaspoon is a volume unit mostly used in cooking recipes and prescriptions. 1 US tsp is about 5 milliliters and 1/6 of fluid ounces. The abbreviations are tsp, ts. Milliliter is a volume unit in metric system. The abbreviation is ml.