Femtofarad is 1e-15 farad units.
Femtofarads to Rontofarads Converter — fF to rF
Convert Femtofarad (fF) to Rontofarad (rF) using the exact conversion factor (1 femtofarad = 1e+12 rontofarad). See the formula, worked examples, and conversion table.
Femtofarads to Rontofarads 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.
Rontofarad is 1e-27 farad units.
Result = input x 1e-15 / 1e-27.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Femtofarads to Rontofarads
Femtofarad and Rontofarad 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 rontofarad is 1e-27 farad units.
Formula
rontofarads = femtofarads × 1e+12
This factor comes from each unit's defined relationship to the category's base unit: 1 femtofarad equals 1e-15 base units, and 1 rontofarad equals 1e-27 base units, so dividing one by the other gives the direct femtofarad-to-rontofarad factor of 1e+12.
Simple example
1 fF × 1e+12 = 1e+12 rF
1 femtofarad = 1e+12 rontofarads.
Real-world example
120 fF × 1e+12 = 1.2e+14 rF
120 femtofarads = 1.2e+14 rontofarads.
Conversion table
| Femtofarad (fF) | Rontofarad (rF) |
|---|---|
| 1 fF | 1e+12 rF |
| 5 fF | 5e+12 rF |
| 12 fF | 1.2e+13 rF |
| 24 fF | 2.4e+13 rF |
| 120 fF | 1.2e+14 rF |
| 240 fF | 2.4e+14 rF |
Reverse conversion: Rontofarad to Femtofarad
1e+12 rF × 1e-12 = 1 fF
1e+12 rontofarads = 1 femtofarad.
femtofarads = rontofarads × 1e-12
For a page dedicated to this direction, see Rontofarad to Femtofarad.
Understanding the Femtofarad (fF)
Femtofarad is 1e-15 farad units.
Understanding the Rontofarad (rF)
Rontofarad is 1e-27 farad units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many rontofarads are in 1 femtofarad?
1 femtofarad equals 1e+12 rontofarads, using the exact defined conversion factor rather than an estimate.
How do I convert femtofarad to rontofarad?
Multiply the femtofarad value by 1e+12. The converter above does this instantly to whatever precision you set.
How do I convert rontofarad back to femtofarad?
Use the reverse factor: 1 rontofarad equals 1e-12 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 rontofarad?
Rontofarad (rF) is a unit of electricity.
Is the femtofarad to rontofarad conversion exact?
Yes. Both femtofarad and rontofarad are defined by fixed standards rather than physical artifacts, so the factor of 1e+12 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.