Femtoampere is 1e-15 ampere units.
Femtoamperes to Amperes Converter — fA to A
Convert Femtoampere (fA) to Ampere (A) using the exact conversion factor (1 femtoampere = 1e-15 ampere). See the formula, worked examples, conversion table, history, and common uses.
Femtoamperes to Amperes 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.
Ampere is the SI unit of electric current.
Result = input x 1e-15 / 1.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Femtoamperes to Amperes
Femtoampere and Ampere 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: Femtoampere is 1e-15 ampere units, and ampere is the SI unit of electric current.
Formula
amperes = femtoamperes × 1e-15
This factor comes from each unit's defined relationship to the category's base unit: 1 femtoampere equals 1e-15 base units, and 1 ampere equals 1 base unit, so dividing one by the other gives the direct femtoampere-to-ampere factor of 1e-15.
Simple example
1 fA × 1e-15 = 1e-15 A
1 femtoampere = 1e-15 amperes.
Real-world example
120 fA × 1e-15 = 1.2e-13 A
120 femtoamperes = 1.2e-13 amperes.
Conversion table
| Femtoampere (fA) | Ampere (A) |
|---|---|
| 1 fA | 1e-15 A |
| 5 fA | 5e-15 A |
| 12 fA | 1.2e-14 A |
| 24 fA | 2.4e-14 A |
| 120 fA | 1.2e-13 A |
| 240 fA | 2.4e-13 A |
Reverse conversion: Ampere to Femtoampere
1e-15 A × 1e+15 = 1 fA
1e-15 amperes = 1 femtoampere.
femtoamperes = amperes × 1e+15
For a page dedicated to this direction, see Ampere to Femtoampere.
Understanding the Femtoampere (fA)
Femtoampere is 1e-15 ampere units.
Understanding the Ampere
Ampere (A) measures electric current. The SI base unit of electric current. It is classified as a SI base unit.
Where it's used: Universal — SI base unit used worldwide
Uses of the Ampere today
- Electrical circuit design and fuse/breaker ratings
- Battery and charger current specifications
- Motor and appliance current draw ratings
History of the Ampere
The ampere is named after André-Marie Ampère (1775–1836), a French physicist and mathematician regarded as one of the founders of classical electromagnetism, for his early work relating electric current to magnetic force.
Originally defined via the force between two parallel current-carrying wires, the ampere was redefined on 20 May 2019 by fixing the elementary charge at exactly 1.602176634 × 10⁻¹⁹ coulombs, so it can now be realized without reference to a specific physical apparatus.
Historical origin. Ampere was not the invention of a single named person; it developed through the process described above.
Ampere — sources
- BIPM SI Brochure, 9th edition — Official definition of the ampere since the 2019 redefinition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many amperes are in 1 femtoampere?
1 femtoampere equals 1e-15 amperes, using the exact defined conversion factor rather than an estimate.
How do I convert femtoampere to ampere?
Multiply the femtoampere value by 1e-15. The converter above does this instantly to whatever precision you set.
How do I convert ampere back to femtoampere?
Use the reverse factor: 1 ampere equals 1e+15 femtoamperes. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtoampere?
Femtoampere (fA) is a unit of electricity.
What is a ampere?
Ampere (A) measures electric current. The SI base unit of electric current. It is classified as a SI base unit.
Is the femtoampere to ampere conversion exact?
Yes. Both femtoampere and ampere are defined by fixed standards rather than physical artifacts, so the factor of 1e-15 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.