Femtosiemens is 1e-15 siemens units.
Femtosiemens to Centisiemens Converter — fS to cS
Convert Femtosiemens (fS) to Centisiemens (cS) using the exact conversion factor (1 femtosiemens = 1e-13 centisiemens). See the formula, worked examples, and conversion table.
Femtosiemens to Centisiemens 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.
Centisiemens is 0.01 siemens units.
Result = input x 1e-15 / 0.01.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Femtosiemens to Centisiemens
Femtosiemens and Centisiemens 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 centisiemens is 0.01 siemens units.
Formula
centisiemens = femtosiemens × 1e-13
This factor comes from each unit's defined relationship to the category's base unit: 1 femtosiemens equals 1e-15 base units, and 1 centisiemens equals 0.01 base units, so dividing one by the other gives the direct femtosiemens-to-centisiemens factor of 1e-13.
Simple example
1 fS × 1e-13 = 1e-13 cS
1 femtosiemens = 1e-13 centisiemens.
Real-world example
120 fS × 1e-13 = 1.2e-11 cS
120 femtosiemens = 1.2e-11 centisiemens.
Conversion table
| Femtosiemens (fS) | Centisiemens (cS) |
|---|---|
| 1 fS | 1e-13 cS |
| 5 fS | 5e-13 cS |
| 12 fS | 1.2e-12 cS |
| 24 fS | 2.4e-12 cS |
| 120 fS | 1.2e-11 cS |
| 240 fS | 2.4e-11 cS |
Reverse conversion: Centisiemens to Femtosiemens
1e-13 cS × 1e+13 = 1 fS
1e-13 centisiemens = 1 femtosiemens.
femtosiemens = centisiemens × 1e+13
For a page dedicated to this direction, see Centisiemens to Femtosiemens.
Understanding the Femtosiemens (fS)
Femtosiemens is 1e-15 siemens units.
Understanding the Centisiemens (cS)
Centisiemens is 0.01 siemens units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many centisiemens are in 1 femtosiemens?
1 femtosiemens equals 1e-13 centisiemens, using the exact defined conversion factor rather than an estimate.
How do I convert femtosiemens to centisiemens?
Multiply the femtosiemens value by 1e-13. The converter above does this instantly to whatever precision you set.
How do I convert centisiemens back to femtosiemens?
Use the reverse factor: 1 centisiemens equals 1e+13 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 centisiemens?
Centisiemens (cS) is a unit of electricity.
Is the femtosiemens to centisiemens conversion exact?
Yes. Both femtosiemens and centisiemens are defined by fixed standards rather than physical artifacts, so the factor of 1e-13 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.