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