Hectosiemens is 100 siemens units.
Hectosiemens to Attosiemens Converter — hS to aS
Convert Hectosiemens (hS) to Attosiemens (aS) using the exact conversion factor (1 hectosiemens = 1e+20 attosiemens). See the formula, worked examples, and conversion table.
Hectosiemens to Attosiemens converter
Converter
Electricity Converter
Convert electrical units by family and calculate voltage, current, resistance, power, and energy with context values.
Context values
Some unit families need one extra value for a physically accurate result.
Attosiemens is 1e-18 siemens units.
Result = input x 100 / 1e-18.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Hectosiemens to Attosiemens
Hectosiemens and Attosiemens both belong to the electricity family — voltage, current, resistance, power, or energy — units that show up constantly when working across the different standards used by household wiring (120V/240V depending on region), automotive electrical systems (12V/24V), and electronics design. Specifically: Hectosiemens is 100 siemens units, and attosiemens is 1e-18 siemens units.
Formula
attosiemens = hectosiemens × 1e+20
This factor comes from each unit's defined relationship to the category's base unit: 1 hectosiemens equals 100 base units, and 1 attosiemens equals 1e-18 base units, so dividing one by the other gives the direct hectosiemens-to-attosiemens factor of 1e+20.
Simple example
1 hS × 1e+20 = 1e+20 aS
1 hectosiemens = 1e+20 attosiemens.
Real-world example
120 hS × 1e+20 = 1.2e+22 aS
120 hectosiemens = 1.2e+22 attosiemens.
Conversion table
| Hectosiemens (hS) | Attosiemens (aS) |
|---|---|
| 1 hS | 1e+20 aS |
| 5 hS | 5e+20 aS |
| 12 hS | 1.2e+21 aS |
| 24 hS | 2.4e+21 aS |
| 120 hS | 1.2e+22 aS |
| 240 hS | 2.4e+22 aS |
Reverse conversion: Attosiemens to Hectosiemens
1e+20 aS × 1e-20 = 1 hS
1e+20 attosiemens = 1 hectosiemens.
hectosiemens = attosiemens × 1e-20
For a page dedicated to this direction, see Attosiemens to Hectosiemens.
Understanding the Hectosiemens (hS)
Hectosiemens is 100 siemens units.
Understanding the Attosiemens (aS)
Attosiemens is 1e-18 siemens units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attosiemens are in 1 hectosiemens?
1 hectosiemens equals 1e+20 attosiemens, using the exact defined conversion factor rather than an estimate.
How do I convert hectosiemens to attosiemens?
Multiply the hectosiemens value by 1e+20. The converter above does this instantly to whatever precision you set.
How do I convert attosiemens back to hectosiemens?
Use the reverse factor: 1 attosiemens equals 1e-20 hectosiemens. You can also use the swap control in the converter above to flip the direction instantly.
What is a hectosiemens?
Hectosiemens (hS) is a unit of electricity.
What is a attosiemens?
Attosiemens (aS) is a unit of electricity.
Is the hectosiemens to attosiemens conversion exact?
Yes. Both hectosiemens and attosiemens 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.
What's the difference between voltage, current, and resistance?
Voltage (volts) is the electrical potential difference driving current through a circuit. Current (amperes) is the rate of flow of electric charge. Resistance (ohms) is how much a component opposes that flow. They're related by Ohm's law (V = I × R), but they are distinct physical quantities, and this page converts between units of just one of them.