Attoliter is 1e-18 liter units.
Attoliters to Quarts Converter — aL to qt
Convert Attoliter (aL) to Quart (qt) using the exact conversion factor (1 attoliter = 1.056688e-18 quart). See the formula, worked examples, conversion table, history, and common uses.
Attoliters to Quarts 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 US liquid quart is one quarter of a US gallon.
Result = input x 1e-21 / 0.000946352946.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Attoliters to Quarts
Attoliter and Quart 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. Specifically: Attoliter is 1e-18 liter units, and a US liquid quart is one quarter of a US gallon.
Formula
quarts = attoliters × 1.056688e-18
This factor comes from each unit's defined relationship to the category's base unit: 1 attoliter equals 1e-21 base units, and 1 quart equals 0.000946352946 base units, so dividing one by the other gives the direct attoliter-to-quart factor of 1.056688e-18.
Simple example
1 aL × 1.056688e-18 = 1.056688e-18 qt
1 attoliter = 1.056688e-18 quarts.
Real-world example
10 aL × 1.056688e-18 = 1.056688e-17 qt
10 attoliters = 1.056688e-17 quarts.
Conversion table
| Attoliter (aL) | Quart (qt) |
|---|---|
| 1 aL | 1.056688e-18 qt |
| 5 aL | 5.283441e-18 qt |
| 10 aL | 1.056688e-17 qt |
| 25 aL | 2.641721e-17 qt |
| 50 aL | 5.283441e-17 qt |
| 100 aL | 1.056688e-16 qt |
Reverse conversion: Quart to Attoliter
1.056688e-18 qt × 9.463529e+17 = 0.9999998018 aL
1.056688e-18 quarts = 0.9999998018 attoliters.
attoliters = quarts × 9.463529e+17
For a page dedicated to this direction, see Quart to Attoliter.
Understanding the Attoliter (aL)
Attoliter is 1e-18 liter units.
Understanding the Quart
Quart (qt) measures volume. The US liquid quart is exactly one-quarter of a US gallon: 0.946352946 liters. It is classified as a US customary unit.
Where it's used: United States (cooking, dairy, motor oil packaging)
Uses of the Quart today
- US recipe measurement (larger liquid volumes)
- US motor oil and automotive fluid packaging
- US dairy and beverage packaging (quart containers)
History of the Quart
The quart ('quarter' of a gallon) follows the same English wine-gallon lineage as the US gallon, retained by the US after England moved to a different imperial standard in 1824.
Historical origin. Quart was not the invention of a single named person; it developed through the process described above.
Quart — sources
- NIST Handbook 44, Appendix C — General tables of units including the US quart definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many quarts are in 1 attoliter?
1 attoliter equals 1.056688e-18 quarts, using the exact defined conversion factor rather than an estimate.
How do I convert attoliter to quart?
Multiply the attoliter value by 1.056688e-18. The converter above does this instantly to whatever precision you set.
How do I convert quart back to attoliter?
Use the reverse factor: 1 quart equals 9.463529e+17 attoliters. You can also use the swap control in the converter above to flip the direction instantly.
What is a attoliter?
Attoliter (aL) is a unit of volume.
What is a quart?
Quart (qt) measures volume. The US liquid quart is exactly one-quarter of a US gallon: 0.946352946 liters. It is classified as a US customary unit.
Is the attoliter to quart conversion exact?
Yes. The US liquid quart is exactly one-quarter of a US gallon: 0.946352946 liters. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.