Zeptoliter is 1e-21 liter units.
Zeptoliters to Attoliters Converter — zL to aL
Convert Zeptoliter (zL) to Attoliter (aL) using the exact conversion factor (1 zeptoliter = 0.001 attoliter). See the formula, worked examples, and conversion table.
Zeptoliters 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 1e-24 / 1e-21.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Zeptoliters to Attoliters
Zeptoliter 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. Specifically: Zeptoliter is 1e-21 liter units, and attoliter is 1e-18 liter units.
Formula
attoliters = zeptoliters × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptoliter equals 1e-24 base units, and 1 attoliter equals 1e-21 base units, so dividing one by the other gives the direct zeptoliter-to-attoliter factor of 0.001.
Simple example
1 zL × 0.001 = 0.001 aL
1 zeptoliter = 0.001 attoliters.
Real-world example
10 zL × 0.001 = 0.01 aL
10 zeptoliters = 0.01 attoliters.
Conversion table
| Zeptoliter (zL) | Attoliter (aL) |
|---|---|
| 1 zL | 0.001 aL |
| 5 zL | 0.005 aL |
| 10 zL | 0.01 aL |
| 25 zL | 0.025 aL |
| 50 zL | 0.05 aL |
| 100 zL | 0.1 aL |
Reverse conversion: Attoliter to Zeptoliter
0.001 aL × 1000 = 1 zL
0.001 attoliters = 1 zeptoliters.
zeptoliters = attoliters × 1000
For a page dedicated to this direction, see Attoliter to Zeptoliter.
Understanding the Zeptoliter (zL)
Zeptoliter is 1e-21 liter units.
Understanding the Attoliter (aL)
Attoliter is 1e-18 liter units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attoliters are in 1 zeptoliter?
1 zeptoliter equals 0.001 attoliters, using the exact defined conversion factor rather than an estimate.
How do I convert zeptoliter to attoliter?
Multiply the zeptoliter value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert attoliter back to zeptoliter?
Use the reverse factor: 1 attoliter equals 1,000 zeptoliters. You can also use the swap control in the converter above to flip the direction instantly.
What is a zeptoliter?
Zeptoliter (zL) is a unit of volume.
What is a attoliter?
Attoliter (aL) is a unit of volume.
Is the zeptoliter to attoliter conversion exact?
Yes. Both zeptoliter and attoliter are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.