Femtofarad is 1e-15 farad units.
Femtofarads to Farads Converter — fF to F
Convert Femtofarad (fF) to Farad (F) using the exact conversion factor (1 femtofarad = 1e-15 farad). See the formula, worked examples, conversion table, history, and common uses.
Femtofarads to Farads 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.
Farad is the SI unit of capacitance.
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 Femtofarads to Farads
Femtofarad and Farad 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: Femtofarad is 1e-15 farad units, and farad is the SI unit of capacitance.
Formula
farads = femtofarads × 1e-15
This factor comes from each unit's defined relationship to the category's base unit: 1 femtofarad equals 1e-15 base units, and 1 farad equals 1 base unit, so dividing one by the other gives the direct femtofarad-to-farad factor of 1e-15.
Simple example
1 fF × 1e-15 = 1e-15 F
1 femtofarad = 1e-15 farads.
Real-world example
120 fF × 1e-15 = 1.2e-13 F
120 femtofarads = 1.2e-13 farads.
Conversion table
| Femtofarad (fF) | Farad (F) |
|---|---|
| 1 fF | 1e-15 F |
| 5 fF | 5e-15 F |
| 12 fF | 1.2e-14 F |
| 24 fF | 2.4e-14 F |
| 120 fF | 1.2e-13 F |
| 240 fF | 2.4e-13 F |
Reverse conversion: Farad to Femtofarad
1e-15 F × 1e+15 = 1 fF
1e-15 farads = 1 femtofarad.
femtofarads = farads × 1e+15
For a page dedicated to this direction, see Farad to Femtofarad.
Understanding the Femtofarad (fF)
Femtofarad is 1e-15 farad units.
Understanding the Farad
Farad (F) measures electrical capacitance. The SI derived unit of electrical capacitance. One farad is an extremely large capacitance for practical electronics — most real-world capacitors are rated in microfarads (µF) or picofarads (pF). It is classified as a SI derived unit.
Where it's used: Universal — SI derived unit used worldwide
Uses of the Farad today
- Capacitor ratings in electronics design
- Circuit timing and filtering calculations
- Battery and supercapacitor energy-storage specifications
History of the Farad
The farad is named after Michael Faraday (1791–1867), an English scientist whose experiments established the laws of electromagnetic induction and electrolysis, laying much of the groundwork for practical electrical engineering.
Historical origin. Farad was not the invention of a single named person; it developed through the process described above.
Farad — sources
- BIPM SI Brochure, 9th edition — Definition of the farad as a coherent SI derived unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many farads are in 1 femtofarad?
1 femtofarad equals 1e-15 farads, using the exact defined conversion factor rather than an estimate.
How do I convert femtofarad to farad?
Multiply the femtofarad value by 1e-15. The converter above does this instantly to whatever precision you set.
How do I convert farad back to femtofarad?
Use the reverse factor: 1 farad equals 1e+15 femtofarads. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtofarad?
Femtofarad (fF) is a unit of electricity.
What is a farad?
Farad (F) measures electrical capacitance. The SI derived unit of electrical capacitance. One farad is an extremely large capacitance for practical electronics — most real-world capacitors are rated in microfarads (µF) or picofarads (pF). It is classified as a SI derived unit.
Is the femtofarad to farad conversion exact?
Yes. Both femtofarad and farad 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.