Attohenry is 1e-18 henry units.
Attohenrys to Zeptohenrys Converter — aH to zH
Convert Attohenry (aH) to Zeptohenry (zH) using the exact conversion factor (1 attohenry = 1,000 zeptohenry). See the formula, worked examples, and conversion table.
Attohenrys to Zeptohenrys 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.
Zeptohenry is 1e-21 henry units.
Result = input x 1e-18 / 1e-21.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Attohenrys to Zeptohenrys
Attohenry and Zeptohenry 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 zeptohenry is 1e-21 henry units.
Formula
zeptohenrys = attohenrys × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 attohenry equals 1e-18 base units, and 1 zeptohenry equals 1e-21 base units, so dividing one by the other gives the direct attohenry-to-zeptohenry factor of 1000.
Simple example
1 aH × 1000 = 1,000 zH
1 attohenry = 1,000 zeptohenrys.
Real-world example
120 aH × 1000 = 120,000 zH
120 attohenrys = 120,000 zeptohenrys.
Conversion table
| Attohenry (aH) | Zeptohenry (zH) |
|---|---|
| 1 aH | 1,000 zH |
| 5 aH | 5,000 zH |
| 12 aH | 12,000 zH |
| 24 aH | 24,000 zH |
| 120 aH | 120,000 zH |
| 240 aH | 240,000 zH |
Reverse conversion: Zeptohenry to Attohenry
1 zH × 0.001 = 0.001 aH
1 zeptohenry = 0.001 attohenrys.
attohenrys = zeptohenrys × 0.001
For a page dedicated to this direction, see Zeptohenry to Attohenry.
Understanding the Attohenry (aH)
Attohenry is 1e-18 henry units.
Understanding the Zeptohenry (zH)
Zeptohenry is 1e-21 henry units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zeptohenrys are in 1 attohenry?
1 attohenry equals 1,000 zeptohenrys, using the exact defined conversion factor rather than an estimate.
How do I convert attohenry to zeptohenry?
Multiply the attohenry value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert zeptohenry back to attohenry?
Use the reverse factor: 1 zeptohenry equals 0.001 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 zeptohenry?
Zeptohenry (zH) is a unit of electricity.
Is the attohenry to zeptohenry conversion exact?
Yes. Both attohenry and zeptohenry 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.