Definition:A teaspoon (symbol: tsp) is a unit of volume based on an item of cutlery. The United States customary teaspoon is equal to exactly 4.928922 mL. The metric teaspoon is equal to 5 mL. One milliliter is equal to 1 cubic centimeter (cm3), 1/1,000,000 cubic meters (m3), or 1/1000 liters. History/Origin:The base unit of the milliliter is the liter (US spelling), spelled "litre" in SI terms. Just type the number of teaspoons into the box and hit the Calculate button. The conversion ratio for Teaspoons to Milliliters is 1 teaspoon = 14.786765 Milliliters. So, we can see that the answer for converting 1 tsp to ml is: 1 teaspoon equals 14.786765 Milliliters. To convert Teaspoons to Milliliters, multiply the Volume by the conversion ratio. One Teaspoons is equal to 4.92892 Milliliters, so use this simple formula to convert: The converter follows the widely used metric convention where 1 teaspoon is equal to 5 milliliters. By using this fixed relationship, you can scale recipes, calculate nutrition data, and write prep sheets in mL while still thinking in teaspoon sized portions at the stove. May 6, 2026 ยท One US teaspoon equals 4.929 ml, while a metric teaspoon equals exactly 5 ml. DigiCalc's teaspoon to ml converter gives you instant, accurate results for any value you enter. To convert Teaspoons to Milliliters, multiply the Volume by the conversion ratio. One Teaspoons is equal to 4.92892 Milliliters, so use this simple formula to convert: Convert between teaspoons and milliliters (tsp and mL) using this calculator tool and conversion tables.