Teaspoons to Fluid Ounces
Type a value in either box to convert between teaspoons and fluid ounces. The factor is 0.166667.
| Teaspoons | Fluid Ounces |
|---|---|
| 1 tsp | 0.166667 fl oz |
| 2 tsp | 0.333333 fl oz |
| 3 tsp | 0.5 fl oz |
| 5 tsp | 0.833333 fl oz |
| 10 tsp | 1.666667 fl oz |
| 25 tsp | 4.166667 fl oz |
| 50 tsp | 8.333333 fl oz |
| 100 tsp | 16.666667 fl oz |
How to use
- Enter a value in the Teaspoons field.
- The Fluid Ounces figure appears immediately — no button to press.
- Typing in the Fluid Ounces field converts back to Teaspoons the same way.
- Use the reference table for the values that come up most often.
Teaspoons to Fluid Ounces formula
To convert teaspoons to fluid ounces, multiply by 0.166666667.
fl oz = tsp × 0.166666667
Put another way, one teaspoon is exactly 1/6 of a fluid ounce.
Why this factor: the teaspoon and the fluid ounce are both defined against the liter, so dividing one definition by the other gives 0.166666667 directly. Both definitions are set out in full below.
To go the other way, divide by 0.166666667 — or use the Fluid Ounces to Teaspoons converter, which is the same calculation reversed.
Worked example
Start with 2 tsp. Multiply by 0.166666667 to get 0.333333 fl oz.
2 tsp × 0.166666667 = 0.333333 fl oz
The converter above does this for any value you type, in either direction.
What is a teaspoon?
A US teaspoon is the smallest common cooking measure, one third of a tablespoon.
Definition: Exactly one sixth of a US fluid ounce, so about 4.9289 milliliters — conventionally rounded to 5 mL.
Where it is used: Recipes, spice and leavening quantities, and liquid medicine doses.
What is a fluid ounce?
A US fluid ounce is a small liquid volume, one eighth of a cup.
Definition: Exactly one 128th of a US liquid gallon, so exactly 29.5735295625 milliliters.
Where it is used: Beverage cans and bottles, cosmetics, and small liquid quantities in the US.
Worth knowing: Measures volume, not weight — a fluid ounce of water weighs about 1.04 avoirdupois ounces. The imperial fluid ounce is 28.41 mL.
Teaspoons vs Fluid Ounces
The teaspoon and the fluid ounce belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many fluid ounces are in a teaspoon?
One teaspoon equals 0.166666667 fluid ounces.
What is the formula to convert teaspoons to fluid ounces?
Multiply the number of teaspoons by 0.166666667. To reverse it, divide by 0.166666667 instead.
How do I convert fluid ounces back to teaspoons?
Divide by 0.166666667, which is the same as multiplying by 6.
How many fluid ounces are in 10 teaspoons?
10 tsp works out to 1.666667 fl oz.
Is there anything to watch out for with fluid ounces?
Measures volume, not weight — a fluid ounce of water weighs about 1.04 avoirdupois ounces. The imperial fluid ounce is 28.41 mL.
How is the teaspoon defined?
Exactly one sixth of a US fluid ounce, so about 4.9289 milliliters — conventionally rounded to 5 mL.