Convert US teaspoons to US fluid ounces
1 US teaspoon is 0.17 fl oz. One US teaspoon is exactly 0.166666666667 US fluid ounces.
One US teaspoon is 0.16666667 US fluid ounces. To convert US teaspoons to US fluid ounces, multiply by 0.16666667; to go the other way, divide by 0.16666667 or multiply by 6. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 130. One third of a tablespoon, about 4.93 ml.
Factor checked against the defining standard · How we check
- US teaspoons × 0.16666667
1 * 0.16666670.167 fl oz
1 US teaspoon in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons (as entered) | 1 tsp | — |
| US tablespoons | 0.3333333333 tbsp | × 0.333333333333 |
| US fluid ounces | 0.1666666667 fl oz | × 0.166666666667 |
| US cups | 0.02083333333 cup | × 0.0208333333333 |
| US pints | 0.01041666667 pt | × 0.0104166666667 |
| US quarts | 0.005208333333 qt | × 0.00520833333333 |
| US gallons | 0.001302083333 gal | × 0.00130208333333 |
| milliliters | 4.928921594 ml | × 4.92892159375 |
| liters | 0.004928921594 L | × 0.00492892159375 |
| imperial gallons | 0.001084211178 gal (UK) | × 0.0010842111779 |
| imperial quarts | 0.004336844712 qt (UK) | × 0.00433684471161 |
| imperial pints | 0.008673689423 pt (UK) | × 0.00867368942322 |
| imperial fluid ounces | 0.1734737885 fl oz (UK) | × 0.173473788464 |
| imperial gills | 0.03469475769 gi (UK) | × 0.0346947576929 |
| cubic millimetres | 4,928.921594 mm³ | × 4,928.92159375 |
| cubic centimetres | 4.928921594 cm³ | × 4.92892159375 |
| cubic inches | 0.30078125 in³ | × 0.30078125 |
| cubic feet | 0.0001740632234 ft³ | × 0.00017406322338 |
| cubic yards | 0.000006446786051 yd³ | × 0.0000064467860511 |
| cubic metres | 0.000004928921594 m³ | × 0.00000492892159375 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert US teaspoons to US fluid ounces? The converter and the working
- 1.Take the measurement in US teaspoons.
- 2.Multiply by 0.16666667 — that is how many US fluid ounces fit in one US teaspoon.
- 3.To go back the other way, divide by 0.16666667, or multiply by 6.
Worked example: 25 US teaspoons to US fluid ounces
- Formula
- tsp × 0.16666667 = fl oz
- Arithmetic
- 25 × 0.16666667 = 4.17 fl oz
- Answer
- 25 tsp = 4.17 fl oz
The factor is rounded for display; the figure above is computed from the full value.
US teaspoons to US fluid ounces conversion table
| US teaspoons | US fluid ounces |
|---|---|
| 1 tsp | 0.17 fl oz |
| 2 tsp | 0.33 fl oz |
| 3 tsp | 0.5 fl oz |
| 4 tsp | 0.67 fl oz |
| 5 tsp | 0.83 fl oz |
| 6 tsp | 1 fl oz |
| 7 tsp | 1.17 fl oz |
| 8 tsp | 1.33 fl oz |
| 9 tsp | 1.5 fl oz |
| 10 tsp | 1.67 fl oz |
| 12 tsp | 2 fl oz |
| 15 tsp | 2.5 fl oz |
| 20 tsp | 3.33 fl oz |
| 25 tsp | 4.17 fl oz |
| 50 tsp | 8.33 fl oz |
| 100 tsp | 16.67 fl oz |
| 200 tsp | 33.33 fl oz |
| 300 tsp | 50 fl oz |
| 500 tsp | 83.33 fl oz |
| 1000 tsp | 166.67 fl oz |
| 2000 tsp | 333.33 fl oz |
| 5000 tsp | 833.33 fl oz |
| 10000 tsp | 1,666.67 fl oz |
What is a US teaspoon?
One third of a tablespoon, about 4.93 ml. A metric teaspoon is a round 5 ml, which is why recipes rarely notice the difference.
What is a US fluid ounce?
Exactly one 128th of a US gallon, which makes it 29.5735295625 ml exactly. The imperial fluid ounce is a different unit at exactly 28.4130625 ml, so a UK recipe calling for 10 fl oz means 284 ml and a US one means 296 ml. It is also a volume, not a weight: an ounce of flour is not a fluid ounce of flour.
How many US fluid ounces are in a US teaspoon?
One US teaspoon is 0.16666667 US fluid ounces. Going the other way, one US fluid ounce is 6 US teaspoons. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a US teaspoon.
Cite this page
- APA
- Rule Calculator. (2026). Convert US teaspoons to US fluid ounces. Rule Calculator. https://rulecalculators.com/convert/teaspoon-to-fluid-ounce
- MLA
- "Convert US teaspoons to US fluid ounces." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/teaspoon-to-fluid-ounce.
- Chicago
- Rule Calculator. "Convert US teaspoons to US fluid ounces." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/teaspoon-to-fluid-ounce.
The date is when the figures on this page were last checked against their source, not the day you opened it. Add your own access date if your style needs one.
Questions people actually ask
- How many US fluid ounces are in a US teaspoon?
- 0.16666667. Exactly one 128th of a US gallon, which makes it 29.5735295625 ml exactly. The imperial fluid ounce is a different unit at exactly 28.4130625 ml, so a UK recipe calling for 10 fl oz means 284 ml and a US one means 296 ml. It is also a volume, not a weight: an ounce of flour is not a fluid ounce of flour.
- How do I convert US fluid ounces back to US teaspoons?
- Divide by 0.16666667, or multiply by 6 — they are the same operation.
Other volume conversions
US fluid ounces to US teaspoons — the same conversion the other way.