Femtosiemens is 1e-15 siemens units.
Femtosiemens to Kilosiemens Converter — fS to kS
Convert Femtosiemens (fS) to Kilosiemens (kS) using the exact conversion factor (1 femtosiemens = 1e-18 kilosiemens). See the formula, worked examples, and conversion table.
Femtosiemens to Kilosiemens 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.
Kilosiemens is 1000 siemens units.
Result = input x 1e-15 / 1000.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Femtosiemens to Kilosiemens
Femtosiemens and Kilosiemens 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 kilosiemens is 1000 siemens units.
Formula
kilosiemens = femtosiemens × 1e-18
This factor comes from each unit's defined relationship to the category's base unit: 1 femtosiemens equals 1e-15 base units, and 1 kilosiemens equals 1000 base units, so dividing one by the other gives the direct femtosiemens-to-kilosiemens factor of 1e-18.
Simple example
1 fS × 1e-18 = 1e-18 kS
1 femtosiemens = 1e-18 kilosiemens.
Real-world example
120 fS × 1e-18 = 1.2e-16 kS
120 femtosiemens = 1.2e-16 kilosiemens.
Conversion table
| Femtosiemens (fS) | Kilosiemens (kS) |
|---|---|
| 1 fS | 1e-18 kS |
| 5 fS | 5e-18 kS |
| 12 fS | 1.2e-17 kS |
| 24 fS | 2.4e-17 kS |
| 120 fS | 1.2e-16 kS |
| 240 fS | 2.4e-16 kS |
Reverse conversion: Kilosiemens to Femtosiemens
1e-18 kS × 1e+18 = 1 fS
1e-18 kilosiemens = 1 femtosiemens.
femtosiemens = kilosiemens × 1e+18
For a page dedicated to this direction, see Kilosiemens to Femtosiemens.
Understanding the Femtosiemens (fS)
Femtosiemens is 1e-15 siemens units.
Understanding the Kilosiemens (kS)
Kilosiemens is 1000 siemens units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilosiemens are in 1 femtosiemens?
1 femtosiemens equals 1e-18 kilosiemens, using the exact defined conversion factor rather than an estimate.
How do I convert femtosiemens to kilosiemens?
Multiply the femtosiemens value by 1e-18. The converter above does this instantly to whatever precision you set.
How do I convert kilosiemens back to femtosiemens?
Use the reverse factor: 1 kilosiemens equals 1e+18 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 kilosiemens?
Kilosiemens (kS) is a unit of electricity.
Is the femtosiemens to kilosiemens conversion exact?
Yes. Both femtosiemens and kilosiemens are defined by fixed standards rather than physical artifacts, so the factor of 1e-18 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.