Last updated: June 04, 2025

Milliohm to Microohm Converter

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Milliohms to Microohms (mΩ to µΩ) Converter

This article will show how to convert electrical resistance measurement units from milliohms (mΩ) to microohms (µΩ). We will cover essential definitions, provide examples, share relevant formulas, and present tables, along with answers to common questions.

Definitions of Ohm, Milliohm, and Microohm

Let’s get started by understanding the key definitions of Ohm (Ω), Milliohm (mΩ), and microohm (µΩ). Understanding these terms will enable you to perform conversions with confidence.

What is Ohm?

The ohm (Ω) is the SI derived unit of electrical resistance. It is defined as the resistance between two points of a conductor when a constant potential difference of one volt is applied across those points, producing a current of one ampere in the conductor, assuming no additional electromotive force is present.[1]

What is Ohm? The definition and illustration
What is Ohm (Ω)?

According to SI prefixes[2], which are based on powers of 10, an ohm (1 Ω) is equivalent to one thousand milliohms (103 or 1,000 mΩ).

Ohms to Milliohms conversion scale
Ohms to milliohms conversion scale

What is Milliohm?

A milliohm (mΩ) is a unit of electrical resistance in the SI system equal to one thousandth (1/1,000) of an ohm (10-3 Ω).

What is Milliohm (mΩ)?
What is Milliohm (mΩ)?

It is commonly used in fields such as power distribution, precision electronic testing, and industrial motor evaluation. Accurately measuring very low resistance values is essential for determining the efficiency and reliability of these systems.

What is Microohm?

A microohm (µΩ) is a unit of electrical resistance in the SI system equal to one millionth (1/1,000,000) of an ohm (10-6 Ω).

What is Microohm (µΩ)?
What is Microohm (µΩ)?

It is vital for detecting hidden flaws in high-stakes systems like EV batteries, power grids, and industrial motors. Even a fraction of extra resistance here can cause overheating, energy waste, or catastrophic failures.

mΩ to µΩ formula

Let’s take a closer look at the conversion formula so you can carry out these conversions independently, whether using a calculator or doing it manually with pencil and paper.

SI Prefixes and Values
SI multiples and submultiples

The milli- prefix in the International System of Units (SI) corresponds to a multiplier of 10-3 (0.001) while the micro- prefix represents 10-6 (0.000001).

To convert milliohms (mΩ) to microohms (µΩ), multiply the resistance value in milliohms by 103 (1,000), since 1 milliohm equals 1,000 microohms.

R(µΩ) = R(mΩ) × 103 = R(mΩ) × 1,000

$$\text{R}_\text{(µΩ)} = \text{R}_\text{(mΩ)} \times 1{,}000$$

Or remember the mΩ-to-µΩ conversion factor: 1 mΩ = 1,000 µΩ

mΩ to µΩ conversion table

The conversion table below provides a handy reference for converting electrical resistance measurement units from milliohms (mΩ) to microohms (µΩ). It covers a range from 0.1 mΩ to 1,000 mΩ, allowing for easy and quick conversions between these units of measurement.

Milliohms (mΩ)Microohms (µΩ)
0.1 mΩ100 µΩ
0.5 mΩ500 µΩ
1 mΩ1,000 µΩ
2 mΩ2,000 µΩ
4 mΩ4,000 µΩ
5 mΩ5,000 µΩ
10 mΩ10,000 µΩ
20 mΩ20,000 µΩ
30 mΩ30,000 µΩ
40 mΩ40,000 µΩ
50 mΩ50,000 µΩ
60 mΩ60,000 µΩ
70 mΩ70,000 µΩ
80 mΩ80,000 µΩ
90 mΩ90,000 µΩ
100 mΩ100,000 µΩ
200 mΩ200,000 µΩ
500 mΩ500,000 µΩ
800 mΩ800,000 µΩ
1,000 mΩ1,000,000 µΩ
Milliohms to microohms (mΩ to µΩ) conversion table

Examples

Now, let's look at an example that illustrates the calculations required to convert from milliohms to microohms (mΩ to µΩ).

Example: Battery Connector Quality Control

For high-performance batteries in electric vehicles, the connector resistance must be minimal to reduce energy loss. Expressing the resistance in microohms offers a clearer comparison with industry standards.

If a battery connector has a resistance of 5.2 mΩ, what is its value in microohms?

Solution

Since 1 milliohm (mΩ) = 1,000 microohms (µΩ), we can convert 5 mΩ to microohms by using the following formula:

$$\text{R}_\text{(µΩ)} = \text{R}_\text{(mΩ)} \times 1{,}000$$
$$\text{R}_\text{(µΩ)} = 5.2 \times 1{,}000 = \boxed{5{,}200 \text{ µΩ}}$$

Therefore, the 5.2 mΩ electrical resistance is equivalent to 5,200 µΩ.

To solve the problem with our calculator, follow the steps below:

  1. Enter the value in milliohms: For this example, enter 5.2 into the From box.
  2. View the result: The converter instantly calculates and displays the equivalent value in microohms: 5,200 µΩ.
Milliohms to microohms converter example
Steps to convert from milliohms to microohms with our calculator

FAQs

Is 1 milliohm or 1 microohm larger?

A milliohm (mΩ) is a thousand times bigger than a microohm (µΩ). Here are the relationships between the units:

  • 1 mΩ = 103 = 1,000 µΩ
  • 1 µΩ = 10-3 = 1 ÷ 1,000 = 0.001 mΩ

How to convert from milliohms to microohms?

To convert electrical resistance from milliohms (mΩ) to microohms (µΩ), follow these simple steps:

  • Step 1: Write down the electrical resistance value in milliohms (mΩ).
  • Step 2: Multiply it by a thousand (1,000).
  • Step 3: The result is the value of the electrical resistance in microoohms (µΩ).

Why do I need to convert milliohms to microohms?

Converting milliohms to microohms is especially useful when you are dealing with extremely small resistance values. When resistance values are so low that measurements in milliohms involve decimals or fractional numbers, converting to microohms offers a whole-number expression that is easier to interpret and compare.

For instance, a resistance measured at 0.005 mΩ can be expressed as 5,000 µΩ. This conversion removes the ambiguity of small decimal values and reduces the risk of misinterpretation during precise measurements and analyses.

You now know how to convert electrical resistance from milliohms (mΩ) to microohms (µΩ). You can quickly use our calculator to convert between the electric resistance measurement units to save time for future calculations.

Milliohm to Microohm Converter

About this app

Milliohm to Microohm Converter

Our milliohms to microohms (mΩ to µΩ) converter is a simple web app for converting electrical resistance measurement units between milliohms (mΩ) and microohms (µΩ), with explanations, formulas, examples, and tables.

Availability

You can use the calculator for free as a PWA web app online or install it locally on any modern operating system, including Android, iOS, Windows 11/10, and macOS.

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References

2 Sources

  1. ⬆️ Wikipedia contributors. (2025, May 25). Ohm.

    https://en.wikipedia.org/w/index.php?title=Ohm&oldid=1292104943
  2. ⬆️ Metric (SI) Prefixes | NIST. (2010, January 13). NIST.

    https://www.nist.gov/pml/owm/metric-si-prefixes