Centiampere is 0.01 ampere units.
Centiamperes to Rontoamperes Converter — cA to rA
Convert Centiampere (cA) to Rontoampere (rA) using the exact conversion factor (1 centiampere = 1e+25 rontoampere). See the formula, worked examples, and conversion table.
Centiamperes to Rontoamperes 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.
Rontoampere is 1e-27 ampere units.
Result = input x 0.01 / 1e-27.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Centiamperes to Rontoamperes
Centiampere and Rontoampere 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: Centiampere is 0.01 ampere units, and rontoampere is 1e-27 ampere units.
Formula
rontoamperes = centiamperes × 1e+25
This factor comes from each unit's defined relationship to the category's base unit: 1 centiampere equals 0.01 base units, and 1 rontoampere equals 1e-27 base units, so dividing one by the other gives the direct centiampere-to-rontoampere factor of 1e+25.
Simple example
1 cA × 1e+25 = 1e+25 rA
1 centiampere = 1e+25 rontoamperes.
Real-world example
120 cA × 1e+25 = 1.2e+27 rA
120 centiamperes = 1.2e+27 rontoamperes.
Conversion table
| Centiampere (cA) | Rontoampere (rA) |
|---|---|
| 1 cA | 1e+25 rA |
| 5 cA | 5e+25 rA |
| 12 cA | 1.2e+26 rA |
| 24 cA | 2.4e+26 rA |
| 120 cA | 1.2e+27 rA |
| 240 cA | 2.4e+27 rA |
Reverse conversion: Rontoampere to Centiampere
1e+25 rA × 1e-25 = 1 cA
1e+25 rontoamperes = 1 centiamperes.
centiamperes = rontoamperes × 1e-25
For a page dedicated to this direction, see Rontoampere to Centiampere.
Understanding the Centiampere (cA)
Centiampere is 0.01 ampere units.
Understanding the Rontoampere (rA)
Rontoampere is 1e-27 ampere units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many rontoamperes are in 1 centiampere?
1 centiampere equals 1e+25 rontoamperes, using the exact defined conversion factor rather than an estimate.
How do I convert centiampere to rontoampere?
Multiply the centiampere value by 1e+25. The converter above does this instantly to whatever precision you set.
How do I convert rontoampere back to centiampere?
Use the reverse factor: 1 rontoampere equals 1e-25 centiamperes. You can also use the swap control in the converter above to flip the direction instantly.
What is a centiampere?
Centiampere (cA) is a unit of electricity.
What is a rontoampere?
Rontoampere (rA) is a unit of electricity.
Is the centiampere to rontoampere conversion exact?
Yes. Both centiampere and rontoampere are defined by fixed standards rather than physical artifacts, so the factor of 1e+25 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.