Kilohenry is 1000 henry units.
Kilohenrys to Attohenrys Converter — kH to aH
Convert Kilohenry (kH) to Attohenry (aH) using the exact conversion factor (1 kilohenry = 1e+21 attohenry). See the formula, worked examples, and conversion table.
Kilohenrys 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 1000 / 1e-18.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Kilohenrys to Attohenrys
Kilohenry 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: Kilohenry is 1000 henry units, and attohenry is 1e-18 henry units.
Formula
attohenrys = kilohenrys × 1e+21
This factor comes from each unit's defined relationship to the category's base unit: 1 kilohenry equals 1000 base units, and 1 attohenry equals 1e-18 base units, so dividing one by the other gives the direct kilohenry-to-attohenry factor of 1e+21.
Simple example
1 kH × 1e+21 = 1e+21 aH
1 kilohenry = 1e+21 attohenrys.
Real-world example
120 kH × 1e+21 = 1.2e+23 aH
120 kilohenrys = 1.2e+23 attohenrys.
Conversion table
| Kilohenry (kH) | Attohenry (aH) |
|---|---|
| 1 kH | 1e+21 aH |
| 5 kH | 5e+21 aH |
| 12 kH | 1.2e+22 aH |
| 24 kH | 2.4e+22 aH |
| 120 kH | 1.2e+23 aH |
| 240 kH | 2.4e+23 aH |
Reverse conversion: Attohenry to Kilohenry
1e+21 aH × 1e-21 = 1 kH
1e+21 attohenrys = 1 kilohenrys.
kilohenrys = attohenrys × 1e-21
For a page dedicated to this direction, see Attohenry to Kilohenry.
Understanding the Kilohenry (kH)
Kilohenry is 1000 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 kilohenry?
1 kilohenry equals 1e+21 attohenrys, using the exact defined conversion factor rather than an estimate.
How do I convert kilohenry to attohenry?
Multiply the kilohenry value by 1e+21. The converter above does this instantly to whatever precision you set.
How do I convert attohenry back to kilohenry?
Use the reverse factor: 1 attohenry equals 1e-21 kilohenrys. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilohenry?
Kilohenry (kH) is a unit of electricity.
What is a attohenry?
Attohenry (aH) is a unit of electricity.
Is the kilohenry to attohenry conversion exact?
Yes. Both kilohenry and attohenry are defined by fixed standards rather than physical artifacts, so the factor of 1e+21 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.