This article will show how to convert electrical resistance measurement units from megaohms (MΩ) to Ohms (Ω). We will cover essential definitions, provide examples, share relevant formulas, and present tables, along with answers to common questions.
Definitions of Ohm and Megaohm
Let’s get started by understanding the key definitions of Ohm (Ω) and Mega-ohm (MΩ). 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]
According to SI prefixes[2], which are based on powers of 10, an ohm (1 Ω) is equivalent to one millionth (1/1,000,000) of a megaohm (10-6 MΩ or 0.000001 MΩ).
What is Megaohm?
A megaohm (MΩ) is a unit of electrical resistance in the SI system equal to one million (1,000,000) ohms (106 Ω).
It is commonly used in high-voltage insulation testing, medical device safety validation, and industrial sensor design, where measuring extreme resistance up to millions of ohms determines critical safety margins and operational reliability.
MΩ to Ω 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.
The mega- prefix in the International System of Units (SI) corresponds to a multiplier of 106 (1,000,000).
To convert megaohms (MΩ) to ohms (Ω), multiply the resistance value in megaohms by 106 (1,000,000), since 1 megaohm equals 1,000,000 ohms.
R(Ω) = R(MΩ) × 106 = R(MΩ) × 1,000,000
Or remember the MΩ-to-Ω conversion factor: 1 MΩ = 106 = 1,000,000 Ω
MΩ to Ω conversion table
The conversion table below provides a handy reference for converting electrical resistance measurement units from megaohms (MΩ) to ohms (Ω). It covers a range from 0.1 MΩ to 1,000 MΩ, allowing for easy and quick conversions between these units of measurement.
| Megaohms (MΩ) | Ohms (Ω) |
|---|---|
| 0.1 MΩ | 100,000 Ω |
| 0.5 MΩ | 500,000 Ω |
| 1 MΩ | 1,000,000 Ω |
| 2 MΩ | 2,000,000 Ω |
| 4 MΩ | 4,000,000 Ω |
| 5 MΩ | 5,000,000 Ω |
| 10 MΩ | 10,000,000 Ω |
| 20 MΩ | 20,000,000 Ω |
| 30 MΩ | 30,000,000 Ω |
| 40 MΩ | 40,000,000 Ω |
| 50 MΩ | 50,000,000 Ω |
| 60 MΩ | 60,000,000 Ω |
| 70 MΩ | 70,000,000 Ω |
| 80 MΩ | 80,000,000 Ω |
| 90 MΩ | 90,000,000 Ω |
| 100 MΩ | 100,000,000 Ω |
| 200 MΩ | 200,000,000 Ω |
| 500 MΩ | 500,000,000 Ω |
| 800 MΩ | 800,000,000 Ω |
| 1,000 MΩ | 1,000,000,000 Ω |
Examples
Now, let's look at an example that illustrates the calculations required to convert from megaohms to ohms (MΩ to Ω).
Example: Medical Device PCB Repair
A printed circuit board (PCB) in a medical device is found to have an insulation resistance of 0.9 MΩ. To ensure the repair work restores full safety compliance, a technician converts this value to ohms.
What is 0.9 MΩ in ohms?
Solution
Since 1 megaohm (MΩ) = 109 = 1,000,000 ohms (Ω), we can convert 0.9 MΩ to ohms by using the following formula:
Therefore, the 0.9 MΩ electrical resistance is equivalent to 900,000 Ω.
To solve the problem with our calculator, follow the steps below:
- Enter the value in megaohms: For this example, enter
0.9into the From box. - View the result: The converter instantly calculates and displays the equivalent value in ohms:
900,000 Ω.
FAQs
Is 1 megaohm or 1 ohm larger?
A megaohm (MΩ) is a million times bigger than an ohm (Ω). Here are the relationships between the units:
1 MΩ = 106 = 1,000,000 Ω1 Ω = 10-6 = 1 ÷ 1,000,000 = 0.000001 MΩ
How to convert from megaohms to ohms?
To convert electrical resistance from megaohms (MΩ) to ohms (Ω), follow these simple steps:
- Step 1: Write down the electrical resistance value in megaohms (MΩ).
- Step 2: Multiply it by a million (
106or1,000,000). - Step 3: The result is the value of the electrical resistance in ohms (Ω).
Why do I need to convert megaohms to ohms?
Converting megaohms to ohms is necessary when your calculations or instruments require a finer scale. One megaohm is equal to 1,000,000 ohms. Many formulas, such as those used in circuit analysis and Ohm's law, use ohms. Converting these measurements improves consistency with datasheets and ensures that your comparisons and computations are accurate.
You now know how to convert electrical resistance from megaohms (MΩ) to ohms (Ω). You can quickly use our calculator to convert between electric resistance measurement units, saving time for future calculations.
