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