Teaspoons to Milliliters Conversion How many mL in a tsp?
To find out how many milliliters in teaspoons, multiply by the conversion factor or use the converter. 1 Teaspoon [US] = mL 1 Teaspoon [Metric, Australia] = 5 mL Teaspoon is a volume unit that is 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 ".