UK fluid ounces
A UK fluid ounce is about 28.41 milliliters, a little smaller than the US fluid ounce of about 29.57 milliliters. So 1 US fluid ounce is about 1.04 UK fluid ounces.
US teaspoons
A US teaspoon is a measurement used in the United States for cooking and baking. One US teaspoon is about 4.93 milliliters.