In the United States, 1 teaspoon = 5 ml.

teaspoon, or teaspoon, abbreviated as Tsp. The teaspoon is also a unit of cooking power. The standard for a teaspoon varies from country to country, but is usually around 5 milliliters. U.S. federal law states that a U.S.-made teaspoon is equal to 5 milliliters, and is also used in Australia, Canada, New Zealand and the United Kingdom.

Traditionally, a US-made teaspoon is equivalent to 0.1667 US-made fluid ounces (4.93 ml), while a traditional British-made teaspoon is equivalent to 0.125 UK-made fluid ounces (3 ．55ml). While one tablespoon equals 3 teaspoons in most places, Australia requires 4 teaspoons to equal 1 teaspoon.

Extended information:

Tbsp:

1 Tbsp = 3 teaspoons = 15 ml

Tbsp is also a unit of capacity. Tablespoon standards vary from country to country, but are usually around 15 ml. Traditionally, in the United States, for example, an American-made spoon is 0.5 ounce (14.8 ml) of liquid, or an American-made teaspoon. US federal law requires the use of US-made spoons, such as the 15ml.

On the other hand, Canada, New Zealand and the United Kingdom set a tablespoon equal to 20 milliliters. But in a traditional English spoon, the amount of liquid in one tablespoon can range from 0.5 to 0.625 ounces (14.2 to 17.8 ml).

Baidu Encyclopedia-Teaspoon