A US fluid ounce is 1/128 of a US gallon.
Fluid ounces to Attoliters Converter — fl oz to aL
Convert Fluid ounce (fl oz) to Attoliter (aL) using the exact conversion factor (1 fluid ounce = 2.957353e+16 attoliter). See the formula, worked examples, conversion table, history, and common uses.
Fluid ounces to Attoliters 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.
Attoliter is 1e-18 liter units.
Result = input x 2.95735296e-5 / 1e-21.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Fluid ounces to Attoliters
Fluid ounce and Attoliter 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
attoliters = fluid ounces × 2.957353e+16
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 attoliter equals 1e-21 base units, so dividing one by the other gives the direct fluid ounce-to-attoliter factor of 2.957353e+16.
Simple example
1 fl oz × 2.957353e+16 = 2.957353e+16 aL
1 fluid ounce = 2.957353e+16 attoliters.
Real-world example
10 fl oz × 2.957353e+16 = 2.957353e+17 aL
10 fluid ounces = 2.957353e+17 attoliters.
Conversion table
| Fluid ounce (fl oz) | Attoliter (aL) |
|---|---|
| 1 fl oz | 2.957353e+16 aL |
| 5 fl oz | 1.478676e+17 aL |
| 10 fl oz | 2.957353e+17 aL |
| 25 fl oz | 7.393382e+17 aL |
| 50 fl oz | 1.478676e+18 aL |
| 100 fl oz | 2.957353e+18 aL |
Reverse conversion: Attoliter to Fluid ounce
2.957353e+16 aL × 3.381402e-17 = 1.000000015 fl oz
2.957353e+16 attoliters = 1.000000015 fluid ounces.
fluid ounces = attoliters × 3.381402e-17
For a page dedicated to this direction, see Attoliter 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 Attoliter (aL)
Attoliter is 1e-18 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 attoliters are in 1 fluid ounce?
1 fluid ounce equals 2.957353e+16 attoliters, using the exact defined conversion factor rather than an estimate.
How do I convert fluid ounce to attoliter?
Multiply the fluid ounce value by 2.957353e+16. The converter above does this instantly to whatever precision you set.
How do I convert attoliter back to fluid ounce?
Use the reverse factor: 1 attoliter equals 3.381402e-17 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 attoliter?
Attoliter (aL) is a unit of volume.
Is the fluid ounce to attoliter 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)