Femtosiemens is 1e-15 siemens units.
Femtosiemens to Zeptosiemens Converter — fS to zS
Convert Femtosiemens (fS) to Zeptosiemens (zS) using the exact conversion factor (1 femtosiemens = 1,000,000 zeptosiemens). See the formula, worked examples, and conversion table.
Femtosiemens to Zeptosiemens 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.
Zeptosiemens is 1e-21 siemens units.
Result = input x 1e-15 / 1e-21.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Femtosiemens to Zeptosiemens
Femtosiemens and Zeptosiemens 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 zeptosiemens is 1e-21 siemens units.
Formula
zeptosiemens = femtosiemens × 1000000
This factor comes from each unit's defined relationship to the category's base unit: 1 femtosiemens equals 1e-15 base units, and 1 zeptosiemens equals 1e-21 base units, so dividing one by the other gives the direct femtosiemens-to-zeptosiemens factor of 1000000.
Simple example
1 fS × 1000000 = 1,000,000 zS
1 femtosiemens = 1,000,000 zeptosiemens.
Real-world example
120 fS × 1000000 = 120,000,000 zS
120 femtosiemens = 120,000,000 zeptosiemens.
Conversion table
| Femtosiemens (fS) | Zeptosiemens (zS) |
|---|---|
| 1 fS | 1,000,000 zS |
| 5 fS | 5,000,000 zS |
| 12 fS | 12,000,000 zS |
| 24 fS | 24,000,000 zS |
| 120 fS | 120,000,000 zS |
| 240 fS | 240,000,000 zS |
Reverse conversion: Zeptosiemens to Femtosiemens
1 zS × 1e-6 = 1e-6 fS
1 zeptosiemens = 1e-6 femtosiemens.
femtosiemens = zeptosiemens × 1e-6
For a page dedicated to this direction, see Zeptosiemens to Femtosiemens.
Understanding the Femtosiemens (fS)
Femtosiemens is 1e-15 siemens units.
Understanding the Zeptosiemens (zS)
Zeptosiemens is 1e-21 siemens units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zeptosiemens are in 1 femtosiemens?
1 femtosiemens equals 1,000,000 zeptosiemens, using the exact defined conversion factor rather than an estimate.
How do I convert femtosiemens to zeptosiemens?
Multiply the femtosiemens value by 1000000. The converter above does this instantly to whatever precision you set.
How do I convert zeptosiemens back to femtosiemens?
Use the reverse factor: 1 zeptosiemens equals 1e-6 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 zeptosiemens?
Zeptosiemens (zS) is a unit of electricity.
Is the femtosiemens to zeptosiemens conversion exact?
Yes. Both femtosiemens and zeptosiemens are defined by fixed standards rather than physical artifacts, so the factor of 1000000 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.