Hectoliter is 100 liter units.
Hectoliters to Attoliters Converter — hL to aL
Convert Hectoliter (hL) to Attoliter (aL) using the exact conversion factor (1 hectoliter = 1e+20 attoliter). See the formula, worked examples, and conversion table.
Hectoliters 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 0.1 / 1e-21.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Hectoliters to Attoliters
Hectoliter 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: Hectoliter is 100 liter units, and attoliter is 1e-18 liter units.
Formula
attoliters = hectoliters × 1e+20
This factor comes from each unit's defined relationship to the category's base unit: 1 hectoliter equals 0.1 base units, and 1 attoliter equals 1e-21 base units, so dividing one by the other gives the direct hectoliter-to-attoliter factor of 1e+20.
Simple example
1 hL × 1e+20 = 1e+20 aL
1 hectoliter = 1e+20 attoliters.
Real-world example
10 hL × 1e+20 = 1e+21 aL
10 hectoliters = 1e+21 attoliters.
Conversion table
| Hectoliter (hL) | Attoliter (aL) |
|---|---|
| 1 hL | 1e+20 aL |
| 5 hL | 5e+20 aL |
| 10 hL | 1e+21 aL |
| 25 hL | 2.5e+21 aL |
| 50 hL | 5e+21 aL |
| 100 hL | 1e+22 aL |
Reverse conversion: Attoliter to Hectoliter
1e+20 aL × 1e-20 = 1 hL
1e+20 attoliters = 1 hectoliter.
hectoliters = attoliters × 1e-20
For a page dedicated to this direction, see Attoliter to Hectoliter.
Understanding the Hectoliter (hL)
Hectoliter is 100 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 hectoliter?
1 hectoliter equals 1e+20 attoliters, using the exact defined conversion factor rather than an estimate.
How do I convert hectoliter to attoliter?
Multiply the hectoliter value by 1e+20. The converter above does this instantly to whatever precision you set.
How do I convert attoliter back to hectoliter?
Use the reverse factor: 1 attoliter equals 1e-20 hectoliters. You can also use the swap control in the converter above to flip the direction instantly.
What is a hectoliter?
Hectoliter (hL) is a unit of volume.
What is a attoliter?
Attoliter (aL) is a unit of volume.
Is the hectoliter to attoliter conversion exact?
Yes. Both hectoliter and attoliter are defined by fixed standards rather than physical artifacts, so the factor of 1e+20 used above is exact to as many digits as you choose to display.