Ohm is the SI unit of electrical resistance.
Ohms to Centiohms Converter — Ohm to cOhm
Convert Ohm (Ohm) to Centiohm (cOhm) using the exact conversion factor (1 ohm = 100 centiohm). See the formula, worked examples, conversion table, history, and common uses.
Ohms to Centiohms 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.
Centiohm is 0.01 ohm units.
Result = input x 1 / 0.01.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Ohms to Centiohms
Ohm and Centiohm 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. Ohm is most often used for resistor and circuit-component ratings.
Formula
centiohms = ohms × 100
This factor comes from each unit's defined relationship to the category's base unit: 1 ohm equals 1 base unit, and 1 centiohm equals 0.01 base units, so dividing one by the other gives the direct ohm-to-centiohm factor of 100.
Simple example
1 Ohm × 100 = 100 cOhm
1 ohm = 100 centiohms.
Real-world example
120 Ohm × 100 = 12,000 cOhm
120 ohms = 12,000 centiohms.
Conversion table
| Ohm (Ohm) | Centiohm (cOhm) |
|---|---|
| 1 Ohm | 100 cOhm |
| 5 Ohm | 500 cOhm |
| 12 Ohm | 1,200 cOhm |
| 24 Ohm | 2,400 cOhm |
| 120 Ohm | 12,000 cOhm |
| 240 Ohm | 24,000 cOhm |
Reverse conversion: Centiohm to Ohm
100 cOhm × 0.01 = 1 Ohm
100 centiohms = 1 ohm.
ohms = centiohms × 0.01
For a page dedicated to this direction, see Centiohm to Ohm.
Understanding the Ohm
Ohm (Ohm) measures electrical resistance. The SI derived unit of electrical resistance, equal to one volt per ampere. It is classified as a SI derived unit.
Where it's used: Universal — SI derived unit used worldwide
Uses of the Ohm today
- Resistor and circuit-component ratings
- Electrical wiring and grounding specifications
- Audio equipment impedance ratings
History of the Ohm
The ohm is named after Georg Simon Ohm (1789–1854), a German physicist who published Ohm's law in 1827, describing the relationship between voltage, current, and resistance (V = I × R) — the relationship the unit itself is defined through.
Historical origin. Ohm was not the invention of a single named person; it developed through the process described above.
Understanding the Centiohm (cOhm)
Centiohm is 0.01 ohm units.
Ohm — sources
- BIPM SI Brochure, 9th edition — Definition of the ohm as a coherent SI derived unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many centiohms are in 1 ohm?
1 ohm equals 100 centiohms, using the exact defined conversion factor rather than an estimate.
How do I convert ohm to centiohm?
Multiply the ohm value by 100. The converter above does this instantly to whatever precision you set.
How do I convert centiohm back to ohm?
Use the reverse factor: 1 centiohm equals 0.01 ohms. You can also use the swap control in the converter above to flip the direction instantly.
What is a ohm?
Ohm (Ohm) measures electrical resistance. The SI derived unit of electrical resistance, equal to one volt per ampere. It is classified as a SI derived unit.
What is a centiohm?
Centiohm (cOhm) is a unit of electricity.
Is the ohm to centiohm conversion exact?
Yes. Both ohm and centiohm are defined by fixed standards rather than physical artifacts, so the factor of 100 used above is exact to as many digits as you choose to display.
Where is the ohm still used today?
Universal — SI derived unit used worldwide
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.