is 1 ml equal to 1 teaspoon?
One teaspoon is equal to around 4.9 milliliters, but in nutrition labelling, one teaspoon is equal to exactly 5 milliliters. The teaspoon is a US customary unit of volume. ... For example, 1 teaspoon can be written as 1 tsp, 1 t, 1 ts, or 1 tspn.