Zeptoampere is 1e-21 ampere units.
Zeptoamperes to Femtoamperes Converter — zA to fA
Convert Zeptoampere (zA) to Femtoampere (fA) using the exact conversion factor (1 zeptoampere = 1e-6 femtoampere). See the formula, worked examples, and conversion table.
Zeptoamperes to Femtoamperes 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.
Femtoampere is 1e-15 ampere units.
Result = input x 1e-21 / 1e-15.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Zeptoamperes to Femtoamperes
Zeptoampere and Femtoampere 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: Zeptoampere is 1e-21 ampere units, and femtoampere is 1e-15 ampere units.
Formula
femtoamperes = zeptoamperes × 1e-6
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptoampere equals 1e-21 base units, and 1 femtoampere equals 1e-15 base units, so dividing one by the other gives the direct zeptoampere-to-femtoampere factor of 1e-6.
Simple example
1 zA × 1e-6 = 1e-6 fA
1 zeptoampere = 1e-6 femtoamperes.
Real-world example
120 zA × 1e-6 = 0.00012 fA
120 zeptoamperes = 0.00012 femtoamperes.
Conversion table
| Zeptoampere (zA) | Femtoampere (fA) |
|---|---|
| 1 zA | 1e-6 fA |
| 5 zA | 0.000005 fA |
| 12 zA | 0.000012 fA |
| 24 zA | 0.000024 fA |
| 120 zA | 0.00012 fA |
| 240 zA | 0.00024 fA |
Reverse conversion: Femtoampere to Zeptoampere
0.000001 fA × 1000000 = 1 zA
0.000001 femtoamperes = 1 zeptoamperes.
zeptoamperes = femtoamperes × 1000000
For a page dedicated to this direction, see Femtoampere to Zeptoampere.
Understanding the Zeptoampere (zA)
Zeptoampere is 1e-21 ampere units.
Understanding the Femtoampere (fA)
Femtoampere is 1e-15 ampere units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtoamperes are in 1 zeptoampere?
1 zeptoampere equals 1e-6 femtoamperes, using the exact defined conversion factor rather than an estimate.
How do I convert zeptoampere to femtoampere?
Multiply the zeptoampere value by 1e-6. The converter above does this instantly to whatever precision you set.
How do I convert femtoampere back to zeptoampere?
Use the reverse factor: 1 femtoampere equals 1,000,000 zeptoamperes. You can also use the swap control in the converter above to flip the direction instantly.
What is a zeptoampere?
Zeptoampere (zA) is a unit of electricity.
What is a femtoampere?
Femtoampere (fA) is a unit of electricity.
Is the zeptoampere to femtoampere conversion exact?
Yes. Both zeptoampere and femtoampere are defined by fixed standards rather than physical artifacts, so the factor of 1e-6 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.