A US fluid ounce is 1/128 of a US gallon.
Fluid ounces to Deciliters Converter — fl oz to dL
Convert Fluid ounce (fl oz) to Deciliter (dL) using the exact conversion factor (1 fluid ounce = 0.2957352956 deciliter). See the formula, worked examples, conversion table, history, and common uses.
Fluid ounces to Deciliters 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.
Deciliter is 0.1 liter units.
Result = input x 2.95735296e-5 / 0.0001.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Fluid ounces to Deciliters
Fluid ounce and Deciliter 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
deciliters = fluid ounces × 0.295735295625
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 deciliter equals 0.0001 base units, so dividing one by the other gives the direct fluid ounce-to-deciliter factor of 0.295735295625.
Simple example
1 fl oz × 0.2957352956 = 0.2957352956 dL
1 fluid ounce = 0.2957352956 deciliters.
Real-world example
10 fl oz × 0.2957352956 = 2.957352956 dL
10 fluid ounces = 2.957352956 deciliters.
Conversion table
| Fluid ounce (fl oz) | Deciliter (dL) |
|---|---|
| 1 fl oz | 0.2957352956 dL |
| 5 fl oz | 1.478676478 dL |
| 10 fl oz | 2.957352956 dL |
| 25 fl oz | 7.393382391 dL |
| 50 fl oz | 14.78676478 dL |
| 100 fl oz | 29.57352956 dL |
Reverse conversion: Deciliter to Fluid ounce
0.2957352956 dL × 3.38140227 = 0.9999999999 fl oz
0.2957352956 deciliters = 0.9999999999 fluid ounces.
fluid ounces = deciliters × 3.38140227018
For a page dedicated to this direction, see Deciliter 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 Deciliter (dL)
Deciliter is 0.1 liter units.
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 deciliters are in 1 fluid ounce?
1 fluid ounce equals 0.2957352956 deciliters, using the exact defined conversion factor rather than an estimate.
How do I convert fluid ounce to deciliter?
Multiply the fluid ounce value by 0.2957352956. The converter above does this instantly to whatever precision you set.
How do I convert deciliter back to fluid ounce?
Use the reverse factor: 1 deciliter equals 3.38140227 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 deciliter?
Deciliter (dL) is a unit of volume.
Is the fluid ounce to deciliter 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)