Electricity converters
Electric Resistance Converter
Convert resistance units: ohm, kilohm, megohm, abohm, statohm and siemens.
Result
1000 Ω
1 kΩ = 1000 Ω
All units for this value
| Unit | Symbol | Value |
|---|---|---|
| Ohm | Ω | 1000 |
| Kilohm | kΩ | 1 |
| Megohm | MΩ | 0.001 |
| Gigaohm | GΩ | 0.000001 |
| Milliohm | mΩ | 1000000 |
| Microohm | µΩ | 1000000000 |
| Volt per ampere | V/A | 1000 |
| Abohm | abΩ | 1000000000000 |
| Statohm | statΩ | 1.11265e-9 |
| Siemens (conductance) | S | 0.001 |
| Millisiemens (conductance) | mS | 1 |
About this calculator
Electric resistance measures how strongly a component opposes the flow of electric current, a core quantity in circuit design and component specification. This converter switches between the SI unit ohm and its metric multiples, the CGS units abohm and statohm, and reciprocal conductance units like siemens and millisiemens.
How it works in plain English
The converter anchors every resistance unit to the ohm and rescales entered values through that shared base. Metric multiples such as kilohm, megohm, and gigaohm follow standard powers-of-ten steps upward, while milliohm and microohm step downward the same way; volt per ampere is included because it is dimensionally and numerically identical to the ohm by Ohm's law. The CGS abohm equals 1e-9 ohm and the statohm equals roughly 8.9876 × 10¹¹ ohms, both legacy units from electromagnetic and electrostatic CGS systems.
Siemens and millisiemens measure conductance, the reciprocal of resistance, so this converter treats them specially: rather than applying a simple multiplying factor, it inverts the entered value, since resistance in ohms equals 1 divided by conductance in siemens. Because dividing by zero has no defined result, entering a value of exactly zero for a target or source measured in siemens or millisiemens displays a dash instead of a number, indicating that an infinite or undefined resistance or conductance would otherwise result.
Select the from and to units, enter a value, and the converted resistance appears immediately, with a full table showing that same value across every supported unit. A precision control adjusts how many decimal places are shown, and a swap button reverses the two selected units in one click.
The formula
- value_in_target = value_in_source × (source factor to Ω) ÷ (target factor to Ω), for ordinary units
- resistance_in_ohms = 1 ÷ conductance_in_siemens, for siemens and millisiemens
- 1 abohm = 1e-9 Ω
- 1 statohm = 8.987551787368176 × 10¹¹ Ω
Worked example
Suppose a component datasheet lists a conductance of 4 millisiemens, and an engineer wants the equivalent resistance in ohms for a circuit calculation. Converting millisiemens to siemens gives 0.004 S, and inverting that value gives 1 ÷ 0.004 = 250 Ω.
Entering 4 into the millisiemens field with ohm selected as the target returns 250 Ω immediately. The full unit table also shows this same value as 0.25 kΩ and 250,000 mΩ, all computed from that single entry, while entering 0 into the millisiemens field instead displays a dash, since a conductance of zero corresponds to infinite resistance.
Electric resistance unit factors
| Unit | Value in ohms |
|---|---|
| 1 ohm (Ω) | 1 |
| 1 kilohm (kΩ) | 1,000 |
| 1 megohm (MΩ) | 1,000,000 |
| 1 abohm (abΩ) | 1e-9 |
| 1 statohm (statΩ) | 8.987551787368176 × 10¹¹ |
| 1 siemens (S), by reciprocal | 1 ÷ conductance value |
Standard unit definitions
Frequently asked questions
Why do siemens and millisiemens work differently from other units here?
Siemens and millisiemens measure conductance, which is the mathematical reciprocal of resistance, rather than resistance itself. Instead of multiplying by a fixed factor like the other units, the converter divides 1 by the entered conductance value to produce an equivalent resistance in ohms, since that reciprocal relationship is how conductance and resistance are defined relative to each other.
Why does entering 0 for siemens show a dash instead of a number?
A conductance of exactly zero would require dividing 1 by 0 to find the equivalent resistance, which is mathematically undefined rather than simply a very large number. Rather than showing an error or an incorrect figure, the converter displays a dash to indicate that no finite resistance corresponds to zero conductance.
Why is volt per ampere treated as the same as the ohm?
Ohm's law states that resistance equals voltage divided by current, so volt per ampere is a direct restatement of the ohm rather than a separate unit needing its own conversion factor. This converter lists it alongside the ohm because the two are numerically identical for any resistance value.
What are the abohm and statohm used for?
Both are legacy CGS units from older physics and electrical engineering literature: the abohm comes from the electromagnetic CGS system and equals a tiny 1e-9 ohm, while the statohm comes from the electrostatic CGS system and equals an enormous 8.9876 × 10¹¹ ohms. They appear mainly in historical texts rather than modern component specifications.
Can I convert a resistance value directly into an equivalent conductance?
Yes. Select ohm, kilohm, or another resistance unit as the from unit and siemens or millisiemens as the target, then enter the resistance value. The converter automatically applies the reciprocal relationship, so there's no need to manually divide the figure by hand.
Does the precision control affect how the reciprocal calculation is done?
No, the reciprocal calculation for siemens and millisiemens is always performed using the full entered value before any rounding is applied for display. The precision control only changes how many decimal places appear in the shown result and unit table, not the accuracy of the underlying division.
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