Attoampere is 1e-18 ampere units.
Attoamperes to Femtoamperes Converter — aA to fA
Convert Attoampere (aA) to Femtoampere (fA) using the exact conversion factor (1 attoampere = 0.001 femtoampere). See the formula, worked examples, and conversion table.
Attoamperes 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-18 / 1e-15.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Attoamperes to Femtoamperes
Attoampere 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: Attoampere is 1e-18 ampere units, and femtoampere is 1e-15 ampere units.
Formula
femtoamperes = attoamperes × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 attoampere equals 1e-18 base units, and 1 femtoampere equals 1e-15 base units, so dividing one by the other gives the direct attoampere-to-femtoampere factor of 0.001.
Simple example
1 aA × 0.001 = 0.001 fA
1 attoampere = 0.001 femtoamperes.
Real-world example
120 aA × 0.001 = 0.12 fA
120 attoamperes = 0.12 femtoamperes.
Conversion table
| Attoampere (aA) | Femtoampere (fA) |
|---|---|
| 1 aA | 0.001 fA |
| 5 aA | 0.005 fA |
| 12 aA | 0.012 fA |
| 24 aA | 0.024 fA |
| 120 aA | 0.12 fA |
| 240 aA | 0.24 fA |
Reverse conversion: Femtoampere to Attoampere
0.001 fA × 1000 = 1 aA
0.001 femtoamperes = 1 attoampere.
attoamperes = femtoamperes × 1000
For a page dedicated to this direction, see Femtoampere to Attoampere.
Understanding the Attoampere (aA)
Attoampere is 1e-18 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 attoampere?
1 attoampere equals 0.001 femtoamperes, using the exact defined conversion factor rather than an estimate.
How do I convert attoampere to femtoampere?
Multiply the attoampere value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert femtoampere back to attoampere?
Use the reverse factor: 1 femtoampere equals 1,000 attoamperes. You can also use the swap control in the converter above to flip the direction instantly.
What is a attoampere?
Attoampere (aA) is a unit of electricity.
What is a femtoampere?
Femtoampere (fA) is a unit of electricity.
Is the attoampere to femtoampere conversion exact?
Yes. Both attoampere and femtoampere are defined by fixed standards rather than physical artifacts, so the factor of 0.001 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.