Attohenry is 1e-18 henry units.
Attohenrys to Femtohenrys Converter — aH to fH
Convert Attohenry (aH) to Femtohenry (fH) using the exact conversion factor (1 attohenry = 0.001 femtohenry). See the formula, worked examples, and conversion table.
Attohenrys to Femtohenrys 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.
Femtohenry is 1e-15 henry 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 Attohenrys to Femtohenrys
Attohenry and Femtohenry 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: Attohenry is 1e-18 henry units, and femtohenry is 1e-15 henry units.
Formula
femtohenrys = attohenrys × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 attohenry equals 1e-18 base units, and 1 femtohenry equals 1e-15 base units, so dividing one by the other gives the direct attohenry-to-femtohenry factor of 0.001.
Simple example
1 aH × 0.001 = 0.001 fH
1 attohenry = 0.001 femtohenrys.
Real-world example
120 aH × 0.001 = 0.12 fH
120 attohenrys = 0.12 femtohenrys.
Conversion table
| Attohenry (aH) | Femtohenry (fH) |
|---|---|
| 1 aH | 0.001 fH |
| 5 aH | 0.005 fH |
| 12 aH | 0.012 fH |
| 24 aH | 0.024 fH |
| 120 aH | 0.12 fH |
| 240 aH | 0.24 fH |
Reverse conversion: Femtohenry to Attohenry
0.001 fH × 1000 = 1 aH
0.001 femtohenrys = 1 attohenry.
attohenrys = femtohenrys × 1000
For a page dedicated to this direction, see Femtohenry to Attohenry.
Understanding the Attohenry (aH)
Attohenry is 1e-18 henry units.
Understanding the Femtohenry (fH)
Femtohenry is 1e-15 henry units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtohenrys are in 1 attohenry?
1 attohenry equals 0.001 femtohenrys, using the exact defined conversion factor rather than an estimate.
How do I convert attohenry to femtohenry?
Multiply the attohenry value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert femtohenry back to attohenry?
Use the reverse factor: 1 femtohenry equals 1,000 attohenrys. You can also use the swap control in the converter above to flip the direction instantly.
What is a attohenry?
Attohenry (aH) is a unit of electricity.
What is a femtohenry?
Femtohenry (fH) is a unit of electricity.
Is the attohenry to femtohenry conversion exact?
Yes. Both attohenry and femtohenry 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.