Attosiemens is 1e-18 siemens units.
Attosiemens to Femtosiemens Converter — aS to fS
Convert Attosiemens (aS) to Femtosiemens (fS) using the exact conversion factor (1 attosiemens = 0.001 femtosiemens). See the formula, worked examples, and conversion table.
Attosiemens to Femtosiemens 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.
Femtosiemens is 1e-15 siemens units.
Result = input x 1e-18 / 1e-15.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Attosiemens to Femtosiemens
Attosiemens and Femtosiemens 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: Attosiemens is 1e-18 siemens units, and femtosiemens is 1e-15 siemens units.
Formula
femtosiemens = attosiemens × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 attosiemens equals 1e-18 base units, and 1 femtosiemens equals 1e-15 base units, so dividing one by the other gives the direct attosiemens-to-femtosiemens factor of 0.001.
Simple example
1 aS × 0.001 = 0.001 fS
1 attosiemens = 0.001 femtosiemens.
Real-world example
120 aS × 0.001 = 0.12 fS
120 attosiemens = 0.12 femtosiemens.
Conversion table
| Attosiemens (aS) | Femtosiemens (fS) |
|---|---|
| 1 aS | 0.001 fS |
| 5 aS | 0.005 fS |
| 12 aS | 0.012 fS |
| 24 aS | 0.024 fS |
| 120 aS | 0.12 fS |
| 240 aS | 0.24 fS |
Reverse conversion: Femtosiemens to Attosiemens
0.001 fS × 1000 = 1 aS
0.001 femtosiemens = 1 attosiemens.
attosiemens = femtosiemens × 1000
For a page dedicated to this direction, see Femtosiemens to Attosiemens.
Understanding the Attosiemens (aS)
Attosiemens is 1e-18 siemens units.
Understanding the Femtosiemens (fS)
Femtosiemens is 1e-15 siemens units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtosiemens are in 1 attosiemens?
1 attosiemens equals 0.001 femtosiemens, using the exact defined conversion factor rather than an estimate.
How do I convert attosiemens to femtosiemens?
Multiply the attosiemens value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert femtosiemens back to attosiemens?
Use the reverse factor: 1 femtosiemens equals 1,000 attosiemens. You can also use the swap control in the converter above to flip the direction instantly.
What is a attosiemens?
Attosiemens (aS) is a unit of electricity.
What is a femtosiemens?
Femtosiemens (fS) is a unit of electricity.
Is the attosiemens to femtosiemens conversion exact?
Yes. Both attosiemens and femtosiemens 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.
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.