Convert Teaspoon to Fluid Ounce (tsp → fl oz)

Converting teaspoons to fluid ounces is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in teaspoons

   Start with the number of teaspoons (tsp) you want to convert.
2. 2
   Multiply by 0.166667

   The conversion factor from tsp to fl oz is 0.166667. Multiply your value by this number.
3. 3
   Read the result in fluid ounces

   The result is your value in fluid ounces (fl oz).

Multiply the value in teaspoons by 0.166667. For the reverse direction, multiply by 6.000002.

• ✓1 tsp = 5 ml (practical); 4.929 ml (US legal).
• ✓3 tsp = 1 tbsp universally.
• ✓Use a proper measuring spoon — household teaspoons vary 3–8 ml.

• ✗Using a regular cutlery teaspoon for medication — can over- or under-dose by 30–60%.
• ✗Mixing tsp and tbsp — 3× difference.
• ✗Assuming "a pinch" or "a dash" is reproducible — it varies 0.1 to 0.5 ml.

What is the Teaspoon?

The teaspoon equals exactly 5 milliliters (international culinary standard) or about 4.929 mL (US strict definition based on 1/3 of a tablespoon). The teaspoon is the smallest standard cooking measure, used worldwide for spices, baking soda, vanilla extract, salt, and small ingredient quantities. A flat (level) teaspoon is the recipe convention; rounded or heaping teaspoons are inconsistent and avoided in serious cooking. The teaspoon is also a medical unit: many liquid medications are dosed in teaspoons (5 mL standard). The teaspoon relates to the tablespoon (1 tbsp = 3 tsp), the cup (48 tsp = 1 cup), the milliliter (1 tsp = 5 mL conventional), and the fluid ounce (6 tsp = 1 fl oz). Standardized 5-mL measuring spoons are available globally to avoid the variability of household teaspoons (which range from 2 to 7 mL).

• Baking powder, salt and spices in recipes
• Over-the-counter liquid-medicine dosing
• Coffee and tea sweetener measurements

What is the Fluid Ounce?

The US fluid ounce equals exactly 29.5735295625 milliliters and is the standard small-volume unit for beverages, cocktails, personal-care products, and cooking in the United States. It is distinct from the (weight) ounce: 1 fluid ounce of water weighs about 1 ounce by weight at room temperature, but other liquids may weigh more or less. Soft-drink cans (12 fl oz), beer bottles (12 fl oz), shampoo bottles, and skin-cream tubs all label volume in fluid ounces. The US fluid ounce is slightly different from the UK imperial fluid ounce (28.4131 mL — about 4% smaller), reflecting the different gallon definitions. The US fl oz relates to the gallon (128 fl oz = 1 gal), the cup (8 fl oz = 1 cup), the tablespoon (2 tbsp = 1 fl oz), and the milliliter (1 fl oz ≈ 29.57 mL). Cocktail recipes universally use fluid ounces.

• US beverage and soda can sizes (12 fl oz)
• Cosmetic and personal-care product volumes
• US fluid recipes and cocktail measures