Attoohm is 1e-18 ohm units.
Attoohms to Milliohms Converter — aOhm to mOhm
Convert Attoohm (aOhm) to Milliohm (mOhm) using the exact conversion factor (1 attoohm = 1e-15 milliohm). See the formula, worked examples, and conversion table.
Attoohms to Milliohms 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.
Milliohm is 0.001 ohm units.
Result = input x 1e-18 / 0.001.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Attoohms to Milliohms
Attoohm and Milliohm 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: Attoohm is 1e-18 ohm units, and milliohm is 0.001 ohm units.
Formula
milliohms = attoohms × 1e-15
This factor comes from each unit's defined relationship to the category's base unit: 1 attoohm equals 1e-18 base units, and 1 milliohm equals 0.001 base units, so dividing one by the other gives the direct attoohm-to-milliohm factor of 1e-15.
Simple example
1 aOhm × 1e-15 = 1e-15 mOhm
1 attoohm = 1e-15 milliohms.
Real-world example
120 aOhm × 1e-15 = 1.2e-13 mOhm
120 attoohms = 1.2e-13 milliohms.
Conversion table
| Attoohm (aOhm) | Milliohm (mOhm) |
|---|---|
| 1 aOhm | 1e-15 mOhm |
| 5 aOhm | 5e-15 mOhm |
| 12 aOhm | 1.2e-14 mOhm |
| 24 aOhm | 2.4e-14 mOhm |
| 120 aOhm | 1.2e-13 mOhm |
| 240 aOhm | 2.4e-13 mOhm |
Reverse conversion: Milliohm to Attoohm
1e-15 mOhm × 1e+15 = 1 aOhm
1e-15 milliohms = 1 attoohm.
attoohms = milliohms × 1e+15
For a page dedicated to this direction, see Milliohm to Attoohm.
Understanding the Attoohm (aOhm)
Attoohm is 1e-18 ohm units.
Understanding the Milliohm (mOhm)
Milliohm is 0.001 ohm units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milliohms are in 1 attoohm?
1 attoohm equals 1e-15 milliohms, using the exact defined conversion factor rather than an estimate.
How do I convert attoohm to milliohm?
Multiply the attoohm value by 1e-15. The converter above does this instantly to whatever precision you set.
How do I convert milliohm back to attoohm?
Use the reverse factor: 1 milliohm equals 1e+15 attoohms. You can also use the swap control in the converter above to flip the direction instantly.
What is a attoohm?
Attoohm (aOhm) is a unit of electricity.
What is a milliohm?
Milliohm (mOhm) is a unit of electricity.
Is the attoohm to milliohm conversion exact?
Yes. Both attoohm and milliohm are defined by fixed standards rather than physical artifacts, so the factor of 1e-15 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.