Convert electrical resistance between ohms, kilohms, megohms and CGS units.
Electricity • 8 units
All 8 units on the Electric Resistance Converter are defined against the Ohm (Ω), so each result is one conversion factor away from a single reference rather than the end of a chain of roundings.
The conversion this page is most often opened for is ready before you type anything: 1 Ω = 0.001 kΩ. Change either side and every row in the table recalculates with it.
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Ohms to kilohms is the conversion this page opens on, and in practice it is run in reverse constantly when reading component markings. A four-band resistor encodes two significant digits and a multiplier, so 4.7 kΩ is printed as 4,700 Ω, while the letter notation used on schematics puts the multiplier where the decimal point would go: 4k7 means 4.7 kΩ and 2R2 means 2.2 Ω. That convention exists because a printed decimal point vanishes on a photocopy or a faint screen, and a lost one is a factor of ten.
The very large rows in the table belong to insulation testing rather than to components. Insulation resistance is measured in megohms and gigaohms at test voltages of 500 V or more, because the quantity only becomes meaningful under stress — a path that reads as an open circuit on a handheld multimeter can conduct at working voltage. This is also where the statohm, roughly 8.99 × 10¹¹ Ω, occasionally surfaces in older electrostatic-unit literature, though nothing in modern practice is specified in it.
Resistance readings are temperature readings in disguise, which is either a nuisance or the whole point. Copper's resistance rises about 0.39% per degree Celsius, so a motor winding measured cold and measured hot returns materially different values — and that same relationship is used deliberately to establish a winding's average temperature without placing a sensor inside it. Platinum resistance thermometers take the principle to its conclusion: a Pt100 is named for reading exactly 100 Ω at 0 °C, so the ohms in this page's table are the temperature, once the standard curve is applied.
Quick reference — 1 Ohm (Ω) is equal to:
| Milliohm | mΩ | 1,000 |
| Microhm | µΩ | 1,000,000 |
| Kilohm | kΩ | 0.001 |
| Megohm | MΩ | 0.000001 |
| Gigaohm | GΩ | 0.000000001 |
| Abohm | abΩ | 1,000,000,000 |
| Statohm | statΩ | 1.112650e-12 |
8 units of electric resistance, each a fixed multiple of the Ω. The table spans 898,755,200,000,000,000,000:1, from abΩ (0.000000001 Ω) to statΩ (898755000000 Ω). Conversion is one multiplication into the base unit and one division out of it, with no lookup table and no approximation.
value_to = value_from × (factor_from ÷ factor_to)1 Ω = 1 Ω1 mΩ = 0.001 Ω1 µΩ = 0.000001 Ω1 kΩ = 1000 Ω1 MΩ = 1000000 Ω1 GΩ = 1000000000 Ω1 abΩ = 0.000000001 Ω1 statΩ = 898755000000 Ωwhere:
Assumptions: Factors are exact definitions. Full double precision is carried internally and rounding is applied only for display.
Result25 Ω = 0.025 kΩ
Resistance is the ratio of voltage across a component to the current through it, and the ohm (Ω) is defined so that one volt drives exactly one ampere through one ohm. Everyday electronics span an enormous range: a current-shunt may be a few milliohms, a signal resistor a few kilohms, and the insulation between two tracks on a circuit board hundreds of megohms.
The reason the multiples matter is that resistance in a circuit is rarely measured directly — it is inferred. A four-wire (Kelvin) measurement exists precisely because the resistance of the test leads themselves, often 20–50 mΩ, is larger than the milliohm-scale part being measured. Converting cleanly between mΩ, Ω, kΩ and MΩ is what keeps that error visible.