A US fluid ounce is 1/128 of a US gallon.
Fluid ounces to Metric teaspoons Converter — fl oz to metric tsp
Convert Fluid ounce (fl oz) to Metric teaspoon (metric tsp) using the exact conversion factor (1 fluid ounce = 5.914705912 metric teaspoon). See the formula, worked examples, conversion table, history, and common uses.
Fluid ounces to Metric teaspoons converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
A metric teaspoon is 5 milliliters.
Result = input x 2.95735296e-5 / 5e-6.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Fluid ounces to Metric teaspoons
Fluid ounce and Metric teaspoon appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Fluid ounce is most often used for us beverage container sizing (soda, water bottles).
Formula
metric teaspoons = fluid ounces × 5.9147059125
This factor comes from each unit's defined relationship to the category's base unit: 1 fluid ounce equals 0.0000295735295625 base units, and 1 metric teaspoon equals 0.000005 base units, so dividing one by the other gives the direct fluid ounce-to-metric teaspoon factor of 5.9147059125.
Simple example
1 fl oz × 5.914705912 = 5.914705912 metric tsp
1 fluid ounce = 5.914705912 metric teaspoons.
Real-world example
10 fl oz × 5.914705912 = 59.14705912 metric tsp
10 fluid ounces = 59.14705912 metric teaspoons.
Conversion table
| Fluid ounce (fl oz) | Metric teaspoon (metric tsp) |
|---|---|
| 1 fl oz | 5.914705912 metric tsp |
| 5 fl oz | 29.57352956 metric tsp |
| 10 fl oz | 59.14705912 metric tsp |
| 25 fl oz | 147.8676478 metric tsp |
| 50 fl oz | 295.7352956 metric tsp |
| 100 fl oz | 591.4705912 metric tsp |
Reverse conversion: Metric teaspoon to Fluid ounce
5.914705912 metric tsp × 0.1690701135 = 0.9999999999 fl oz
5.914705912 metric teaspoons = 0.9999999999 fluid ounces.
fluid ounces = metric teaspoons × 0.169070113509
For a page dedicated to this direction, see Metric teaspoon to Fluid ounce.
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.
Understanding the Metric teaspoon (metric tsp)
A metric teaspoon is 5 milliliters.
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 metric teaspoons are in 1 fluid ounce?
1 fluid ounce equals 5.914705912 metric teaspoons, using the exact defined conversion factor rather than an estimate.
How do I convert fluid ounce to metric teaspoon?
Multiply the fluid ounce value by 5.914705912. The converter above does this instantly to whatever precision you set.
How do I convert metric teaspoon back to fluid ounce?
Use the reverse factor: 1 metric teaspoon equals 0.1690701135 fluid ounces. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a metric teaspoon?
Metric teaspoon (metric tsp) is a unit of volume.
Is the fluid ounce to metric teaspoon 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.
Where is the fluid ounce still used today?
United States (beverage, nutrition labeling)