This calculator allows you to convert from Teaspoon (UK) to Fluid ounce (US) and in a reverse direction. To convert from Teaspoon (UK) to Fluid ounce (US), enter the amount of Teaspoon (UK) into the first input and to convert from Fluid ounce (US) to Teaspoon (UK), enter the amount of Fluid ounce (US) into the second input.