Rontoohm is 1e-27 ohm units.
Rontoohms to Attoohms Converter — rOhm to aOhm
Convert Rontoohm (rOhm) to Attoohm (aOhm) using the exact conversion factor (1 rontoohm = 1e-9 attoohm). See the formula, worked examples, and conversion table.
Rontoohms to Attoohms 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.
Attoohm is 1e-18 ohm units.
Result = input x 1e-27 / 1e-18.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Rontoohms to Attoohms
Rontoohm and Attoohm 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: Rontoohm is 1e-27 ohm units, and attoohm is 1e-18 ohm units.
Formula
attoohms = rontoohms × 1e-9
This factor comes from each unit's defined relationship to the category's base unit: 1 rontoohm equals 1e-27 base units, and 1 attoohm equals 1e-18 base units, so dividing one by the other gives the direct rontoohm-to-attoohm factor of 1e-9.
Simple example
1 rOhm × 1e-9 = 1e-9 aOhm
1 rontoohm = 1e-9 attoohms.
Real-world example
120 rOhm × 1e-9 = 1.2e-7 aOhm
120 rontoohms = 1.2e-7 attoohms.
Conversion table
| Rontoohm (rOhm) | Attoohm (aOhm) |
|---|---|
| 1 rOhm | 1e-9 aOhm |
| 5 rOhm | 5e-9 aOhm |
| 12 rOhm | 1.2e-8 aOhm |
| 24 rOhm | 2.4e-8 aOhm |
| 120 rOhm | 1.2e-7 aOhm |
| 240 rOhm | 2.4e-7 aOhm |
Reverse conversion: Attoohm to Rontoohm
1e-9 aOhm × 1000000000 = 1 rOhm
1e-9 attoohms = 1 rontoohms.
rontoohms = attoohms × 1000000000
For a page dedicated to this direction, see Attoohm to Rontoohm.
Understanding the Rontoohm (rOhm)
Rontoohm is 1e-27 ohm units.
Understanding the Attoohm (aOhm)
Attoohm is 1e-18 ohm units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attoohms are in 1 rontoohm?
1 rontoohm equals 1e-9 attoohms, using the exact defined conversion factor rather than an estimate.
How do I convert rontoohm to attoohm?
Multiply the rontoohm value by 1e-9. The converter above does this instantly to whatever precision you set.
How do I convert attoohm back to rontoohm?
Use the reverse factor: 1 attoohm equals 1,000,000,000 rontoohms. You can also use the swap control in the converter above to flip the direction instantly.
What is a rontoohm?
Rontoohm (rOhm) is a unit of electricity.
What is a attoohm?
Attoohm (aOhm) is a unit of electricity.
Is the rontoohm to attoohm conversion exact?
Yes. Both rontoohm and attoohm are defined by fixed standards rather than physical artifacts, so the factor of 1e-9 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.