Kiloampere is 1000 ampere units.
Kiloamperes to Attoamperes Converter — kA to aA
Convert Kiloampere (kA) to Attoampere (aA) using the exact conversion factor (1 kiloampere = 1e+21 attoampere). See the formula, worked examples, and conversion table.
Kiloamperes to Attoamperes 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.
Attoampere is 1e-18 ampere 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 Kiloamperes to Attoamperes
Kiloampere and Attoampere 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: Kiloampere is 1000 ampere units, and attoampere is 1e-18 ampere units.
Formula
attoamperes = kiloamperes × 1e+21
This factor comes from each unit's defined relationship to the category's base unit: 1 kiloampere equals 1000 base units, and 1 attoampere equals 1e-18 base units, so dividing one by the other gives the direct kiloampere-to-attoampere factor of 1e+21.
Simple example
1 kA × 1e+21 = 1e+21 aA
1 kiloampere = 1e+21 attoamperes.
Real-world example
120 kA × 1e+21 = 1.2e+23 aA
120 kiloamperes = 1.2e+23 attoamperes.
Conversion table
| Kiloampere (kA) | Attoampere (aA) |
|---|---|
| 1 kA | 1e+21 aA |
| 5 kA | 5e+21 aA |
| 12 kA | 1.2e+22 aA |
| 24 kA | 2.4e+22 aA |
| 120 kA | 1.2e+23 aA |
| 240 kA | 2.4e+23 aA |
Reverse conversion: Attoampere to Kiloampere
1e+21 aA × 1e-21 = 1 kA
1e+21 attoamperes = 1 kiloamperes.
kiloamperes = attoamperes × 1e-21
For a page dedicated to this direction, see Attoampere to Kiloampere.
Understanding the Kiloampere (kA)
Kiloampere is 1000 ampere units.
Understanding the Attoampere (aA)
Attoampere is 1e-18 ampere units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attoamperes are in 1 kiloampere?
1 kiloampere equals 1e+21 attoamperes, using the exact defined conversion factor rather than an estimate.
How do I convert kiloampere to attoampere?
Multiply the kiloampere value by 1e+21. The converter above does this instantly to whatever precision you set.
How do I convert attoampere back to kiloampere?
Use the reverse factor: 1 attoampere equals 1e-21 kiloamperes. You can also use the swap control in the converter above to flip the direction instantly.
What is a kiloampere?
Kiloampere (kA) is a unit of electricity.
What is a attoampere?
Attoampere (aA) is a unit of electricity.
Is the kiloampere to attoampere conversion exact?
Yes. Both kiloampere and attoampere 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.