Convert US teaspoons to Imperial fluid ounces
1 US teaspoon is 0.17 fl oz (UK). One US teaspoon is exactly 0.173473788464 imperial fluid ounces.
One US teaspoon is 0.17347379 imperial fluid ounces. To convert US teaspoons to imperial fluid ounces, multiply by 0.17347379; to go the other way, divide by 0.17347379 or multiply by 5.7645596. 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 × 0.17347379
1 * 0.17347380.173 fl oz (UK)
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 imperial fluid ounces? The converter and the working
- 1.Take the measurement in US teaspoons.
- 2.Multiply by 0.17347379 — that is how many imperial fluid ounces fit in one US teaspoon.
- 3.To go back the other way, divide by 0.17347379, or multiply by 5.7645596.
Worked example: 25 US teaspoons to imperial fluid ounces
- Formula
- tsp × 0.17347379 = fl oz (UK)
- Arithmetic
- 25 × 0.17347379 = 4.34 fl oz (UK)
- Answer
- 25 tsp = 4.34 fl oz (UK)
The factor is rounded for display; the figure above is computed from the full value.
US teaspoons to imperial fluid ounces conversion table
| US teaspoons | Imperial fluid ounces |
|---|---|
| 1 tsp | 0.17 fl oz (UK) |
| 2 tsp | 0.35 fl oz (UK) |
| 3 tsp | 0.52 fl oz (UK) |
| 4 tsp | 0.69 fl oz (UK) |
| 5 tsp | 0.87 fl oz (UK) |
| 6 tsp | 1.04 fl oz (UK) |
| 7 tsp | 1.21 fl oz (UK) |
| 8 tsp | 1.39 fl oz (UK) |
| 9 tsp | 1.56 fl oz (UK) |
| 10 tsp | 1.73 fl oz (UK) |
| 12 tsp | 2.08 fl oz (UK) |
| 15 tsp | 2.6 fl oz (UK) |
| 20 tsp | 3.47 fl oz (UK) |
| 25 tsp | 4.34 fl oz (UK) |
| 50 tsp | 8.67 fl oz (UK) |
| 100 tsp | 17.35 fl oz (UK) |
| 200 tsp | 34.69 fl oz (UK) |
| 300 tsp | 52.04 fl oz (UK) |
| 500 tsp | 86.74 fl oz (UK) |
| 1000 tsp | 173.47 fl oz (UK) |
| 2000 tsp | 346.95 fl oz (UK) |
| 5000 tsp | 867.37 fl oz (UK) |
| 10000 tsp | 1,734.74 fl oz (UK) |
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 an imperial fluid ounce?
One 160th of an imperial gallon, 28.4130625 ml exactly. The US fluid ounce is one 128th of a smaller gallon at 29.57 ml, so the two ounces differ by about 4% in the opposite direction to the gallons.
How many imperial fluid ounces are in a US teaspoon?
One US teaspoon is 0.17347379 imperial fluid ounces. Going the other way, one imperial fluid ounce is 5.7645596 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 imperial fluid ounces. Rule Calculator. https://rulecalculators.com/convert/teaspoon-to-imperial-fluid-ounce
- MLA
- "Convert US teaspoons to imperial fluid ounces." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/teaspoon-to-imperial-fluid-ounce.
- Chicago
- Rule Calculator. "Convert US teaspoons to imperial fluid ounces." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/teaspoon-to-imperial-fluid-ounce.
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Questions people actually ask
- How many imperial fluid ounces are in a US teaspoon?
- 0.17347379. One 160th of an imperial gallon, 28.4130625 ml exactly. The US fluid ounce is one 128th of a smaller gallon at 29.57 ml, so the two ounces differ by about 4% in the opposite direction to the gallons.
- How do I convert imperial fluid ounces back to US teaspoons?
- Divide by 0.17347379, or multiply by 5.7645596 — they are the same operation.
Other volume conversions
Imperial fluid ounces to US teaspoons — the same conversion the other way.