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Electrical resistance is measured in ohms (Ω), but real components span an enormous range — from the milliohm-level resistance of a thick copper busbar or current-sense shunt, up through the kilohm and megohm resistors used in everyday circuits, to the gigaohm-level insulation resistance tested in high-voltage equipment. Because of this huge range, engineers constantly switch between micro-, milli-, kilo-, mega- and giga-ohm prefixes rather than writing out long strings of zeros.
| Unit | Symbol | Value in Ohms |
|---|---|---|
| Microohm | µΩ | 10⁻⁶ Ω |
| Milliohm | mΩ | 10⁻³ Ω |
| Ohm | Ω | 1 Ω |
| Kiloohm | kΩ | 10³ Ω |
| Megaohm | MΩ | 10⁶ Ω |
| Gigaohm | GΩ | 10⁹ Ω |
Divide by 1000: e.g. 4700 Ω = 4.7 kΩ.
Multiply by 1,000,000: e.g. 2.2 MΩ = 2,200,000 Ω.
Milliohms are used to specify very low resistances, such as current-sense shunt resistors, connector contact resistance, and PCB trace/busbar resistance, where a full ohm would be far too coarse a unit.
Good insulation on cables and motor windings commonly tests in the hundreds of megaohms to several gigaohms range; readings dropping into the low megaohms or below often indicate insulation degradation or moisture ingress.
Standard through-hole and SMD resistors are practically manufactured up to around 10-22 MΩ for typical film/carbon types; higher resistances become impractical to manufacture precisely and are more commonly achieved with specialized high-value resistor technologies.
Match the precision of your original measurement — a multimeter reading with 2-3 significant figures shouldn't be converted and reported with 6+ digits of false precision, even though the arithmetic conversion itself is exact.
It is an alternate shorthand for megaohm, sometimes used because the Ω symbol and "M" prefix can be hard to print or distinguish clearly on small component markings.
In ideal terms, yes — 0 Ω represents a perfect conductor with no voltage drop for any current. Real "zero-ohm" links and closed switches have a small but non-zero resistance (often in the milliohm range) due to the physical conductor and contact resistance.
Use the converter above by selecting your source unit and entering the value — the tool instantly shows the equivalent in all other common resistance units.
Standard digital multimeters typically measure from a fraction of an ohm up to tens or hundreds of megaohms, though accuracy usually degrades toward both extremes — specialized micro-ohmmeters and megohmmeters (insulation testers) are used for precise measurement at the very low and very high ends respectively.
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