A metric teaspoon is 5 milliliters.
Metric teaspoons to Fluid ounces Converter — metric tsp to fl oz
Convert Metric teaspoon (metric tsp) to Fluid ounce (fl oz) using the exact conversion factor (1 metric teaspoon = 0.1690701135 fluid ounce). See the formula, worked examples, conversion table, history, and common uses.
Metric teaspoons to Fluid ounces converter
Converter
Cooking Converter
Convert cooking volume and mass units used in recipes and nutrition workflows.
Context values
Some unit families need one extra value for a physically accurate result.
A US fluid ounce is 1/128 of a US gallon.
Result = input x 5e-6 / 2.95735296e-5.
Volume units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Metric teaspoons to Fluid ounces
Metric teaspoon and Fluid ounce both show up in recipes, and converting between them matters whenever a recipe from one country's cookbook needs to be followed with another country's measuring tools. Specifically: A metric teaspoon is 5 milliliters, and a US fluid ounce is 1/128 of a US gallon.
Formula
fluid ounces = metric teaspoons × 0.169070113509
This factor comes from each unit's defined relationship to the category's base unit: 1 metric teaspoon equals 0.000005 base units, and 1 fluid ounce equals 0.0000295735295625 base units, so dividing one by the other gives the direct metric teaspoon-to-fluid ounce factor of 0.169070113509.
Simple example
1 metric tsp × 0.1690701135 = 0.1690701135 fl oz
1 metric teaspoon = 0.1690701135 fluid ounces.
Real-world example
2 metric tsp × 0.1690701135 = 0.338140227 fl oz
2 metric teaspoons = 0.338140227 fluid ounces.
Conversion table
| Metric teaspoon (metric tsp) | Fluid ounce (fl oz) |
|---|---|
| 0.25 metric tsp | 0.0422675284 fl oz |
| 0.5 metric tsp | 0.0845350568 fl oz |
| 1 metric tsp | 0.1690701135 fl oz |
| 2 metric tsp | 0.338140227 fl oz |
| 4 metric tsp | 0.676280454 fl oz |
| 8 metric tsp | 1.352560908 fl oz |
Reverse conversion: Fluid ounce to Metric teaspoon
0.1690701135 fl oz × 5.914705912 = 0.9999999999 metric tsp
0.1690701135 fluid ounces = 0.9999999999 metric teaspoons.
metric teaspoons = fluid ounces × 5.9147059125
For a page dedicated to this direction, see Fluid ounce to Metric teaspoon.
Understanding the Metric teaspoon (metric tsp)
A metric teaspoon is 5 milliliters.
Understanding the Fluid ounce
Fluid ounce (fl oz) measures volume. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. It is classified as a US customary unit.
Where it's used: United States (beverage, nutrition labeling)
Uses of the Fluid ounce today
- US beverage container sizing (soda, water bottles)
- US nutrition and medication dosing labels
History of the Fluid ounce
The US fluid ounce follows from the same English wine-gallon system as the rest of the US liquid volume units, defined as a consistent fraction of the gallon.
Historical origin. Fluid ounce was not the invention of a single named person; it developed through the process described above.
Fluid ounce — sources
- NIST Handbook 44, Appendix C — General tables of units including the US fluid ounce definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many fluid ounces are in 1 metric teaspoon?
1 metric teaspoon equals 0.1690701135 fluid ounces, using the exact defined conversion factor rather than an estimate.
How do I convert metric teaspoon to fluid ounce?
Multiply the metric teaspoon value by 0.1690701135. The converter above does this instantly to whatever precision you set.
How do I convert fluid ounce back to metric teaspoon?
Use the reverse factor: 1 fluid ounce equals 5.914705912 metric teaspoons. You can also use the swap control in the converter above to flip the direction instantly.
What is a metric teaspoon?
Metric teaspoon (metric tsp) is a unit of cooking.
What is a fluid ounce?
Fluid ounce (fl oz) measures volume. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. It is classified as a US customary unit.
Is the metric teaspoon to fluid ounce conversion exact?
Yes. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.