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Resistance Conversion
Tool Description
Resistance Conversion is an online resistance unit converter that supports mutual conversion between ohm (Ω), milliohm (mΩ), kiloohm (kΩ), megaohm (MΩ), gigaohm (GΩ), and microohm (μΩ). Enter any value and unit to instantly view corresponding results in all other units, suitable for electronic circuit design, component selection, physics learning, electrical engineering, and more.
How to Use
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Enter a value
Input the value to convert in the input field, supporting integers and decimals, e.g.,
1000,0.1 -
Choose the unit
Select the resistance unit of the current value from the "Source Unit" dropdown list (Ω/mΩ/kΩ/MΩ/GΩ/μΩ)
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View results
Click the "Convert" button or press Enter, and the result area below will display corresponding values in all units, with a copy button on the right of each result for convenient use
Use Cases
- Electronic circuit design: Resistors in circuit design are often marked with different units such as Ω, kΩ, and MΩ. Schematic and PCB design require frequent unit conversions, and this tool can quickly complete them
- Component selection: When purchasing resistors, suppliers may use different unit notations for resistance values (e.g., 4.7 kΩ = 4,700 Ω). Use this tool to quickly compare different marking methods
- Electrical engineering & physics learning: In Ohm's law (V=IR) calculations, practice conversions between different unit systems (Ω, kΩ, MΩ); insulation resistance in power systems is often measured in MΩ or GΩ, while conductor resistance uses mΩ or μΩ. Quickly switch between different magnitudes with this tool
Key Advantages
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Free Daily Allowance
Free daily usage credits are provided so casual, light conversion needs can be met at zero cost without paying for occasional use.
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Privacy & Security
All conversions run entirely in your browser. Your input values are never uploaded to any server, protecting your data privacy 100%.
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Comprehensive Coverage
Supports 6 resistance units including Ω, mΩ, kΩ, MΩ, GΩ, and μΩ. Enter a value once and instantly see results in every unit, meeting circuit design, component selection, and many other needs.
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Ready to Use
No installation or registration required. Open your browser and use it directly on computers, phones, and tablets across all platforms.
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Simple & Easy
Enter a value, choose a unit, and convert in just three steps. Results are clearly displayed and can be copied with one click.
Resistance Unit Conversion Relationships
The following shows the conversion relationships between resistance units, with ohm (Ω) as the base unit:
| Unit Name | Abbreviation | Conversion Relationship | Equivalent Ω |
|---|---|---|---|
| Ohm | Ω | 1 Ω（基准单位） | 1 |
| Milliohm | mΩ | 1 mΩ = 0.001 Ω | 0.001 |
| Kiloohm | kΩ | 1 kΩ = 1,000 Ω | 1,000 |
| Megaohm | MΩ | 1 MΩ = 1,000,000 Ω | 1,000,000 |
| Gigaohm | GΩ | 1 GΩ = 10⁹ Ω | 1,000,000,000 |
| Microohm | μΩ | 1 μΩ = 10⁻⁶ Ω | 0.000001 |
Common Resistance Value Reference
The following shows common resistance value ranges in different scenarios for reference comparison:
| Scenario/Object | Typical Resistance |
|---|---|
| Copper wire (1m, 2.5mm²) | ~0.01 Ω |
| Current sense resistor | 0.1 ~ 1 Ω |
| Common electronic circuit resistors | 10 Ω ~ 1 MΩ |
| Pull-up / Pull-down resistor | 100 Ω ~ 10 kΩ |
| Human body resistance (dry skin) | 1 kΩ ~ 100 kΩ |
| Insulation material resistance | 10 MΩ ~ 1000 MΩ |
| Voltage divider / Bias resistor | 1 kΩ ~ 10 MΩ |
Ohm's Law and Resistance
Resistance (symbol R) measures how strongly a conductor opposes the flow of electric current, with the unit of ohm (Ω), named after German physicist Georg Ohm. According to Ohm's law: R = V / I, meaning resistance equals voltage divided by current. When the voltage across a conductor is 1 volt (V) and the current flowing through it is 1 ampere (A), the conductor has a resistance of 1 ohm.
The SI unit of resistance is the ohm. Commonly used units also include kiloohm (kΩ), megaohm (MΩ), and gigaohm (GΩ) for large resistances, and milliohm (mΩ) and microohm (μΩ) for small resistances. For example: wire resistance is typically in the mΩ range, while insulator resistance can reach hundreds of MΩ or even GΩ. In electronic circuit design, resistors are one of the most fundamental components, with common resistance values ranging from 0.1 Ω to tens of MΩ.
FAQ
Ohm (symbol Ω) is the standard unit of electrical resistance in the International System of Units (SI), named after German physicist Georg Simon Ohm. According to Ohm's law, 1 Ω = 1 V/A, meaning when a conductor has a voltage of 1 volt across it and a current of 1 ampere flowing through it, its resistance is 1 ohm. Resistance measures how strongly a conductor opposes the flow of electric current, and is one of the most fundamental quantities in electronics and electrical engineering.
Resistance units follow a strict decimal thousand-fold relationship: 1 kΩ = 1,000 Ω, 1 MΩ = 1,000 kΩ = 1,000,000 Ω, 1 GΩ = 1,000 MΩ = 1,000,000,000 Ω. Conversely, 1 Ω = 0.001 kΩ = 0.000001 MΩ. This thousand-based relationship is consistent with metric unit prefixes (kilo-, mega-, giga-), making it easy to remember and convert. For example, a 4.7 kΩ resistor = 4,700 Ω = 0.0047 MΩ.
1 mΩ = 0.001 Ω, 1 μΩ = 0.000001 Ω = 0.001 mΩ. These extremely small units are typically used for measuring conductor resistance and contact resistance. For example: a 1-meter copper wire with a 2.5 mm² cross-section has a resistance of about 6.9 mΩ; relay contact resistance is typically in the range of 10~100 mΩ. Superconductors have zero resistance below their critical temperature. In power systems, switchgear contact resistance requirements are typically in the μΩ range — excessive resistance can cause heating and energy loss.
Color band coding is the most common method for marking resistance values on through-hole resistors. There are typically 4-band (standard precision) and 5-band (high precision) types. The first 2~3 bands represent significant digits, the second-to-last band represents the multiplier (power of 10), and the last band represents tolerance. For example: a 4-band resistor brown-black-red-gold = 10 × 10² = 1,000 Ω = 1 kΩ, tolerance ±5%; a 5-band resistor brown-black-black-brown-brown = 100 × 10¹ = 1,000 Ω = 1 kΩ, tolerance ±1%. Color-to-digit mapping: black(0), brown(1), red(2), orange(3), yellow(4), green(5), blue(6), violet(7), gray(8), white(9).
No. All conversion calculations are performed entirely in your browser locally using pure JavaScript math. Your input data never leaves your device, so please feel free to use it.
This tool uses JavaScript double-precision floating-point numbers (64-bit IEEE 754) for calculations, which is sufficiently accurate for most everyday scenarios. Resistance units follow a strict decimal thousand-fold relationship (1 Ω = 10³ mΩ = 10⁻³ kΩ = 10⁻⁶ MΩ = 10⁻⁹ GΩ = 10⁶ μΩ) without approximate conversions, so results are exact within floating-point range. Up to 6 significant decimal places are retained, with excess digits automatically truncated.
A resistance converter is an online tool for converting between resistance units. It helps users quickly convert between common units such as ohm (Ω), milliohm (mΩ), kiloohm (kΩ), megaohm (MΩ), gigaohm (GΩ), and microohm (μΩ), serving fields like electronic circuit design, component selection, and electrical engineering — with no software installation required.
6 common resistance units are supported. These include ohm (Ω), milliohm (mΩ), kiloohm (kΩ), megaohm (MΩ), gigaohm (GΩ), and microohm (μΩ), covering everything from microohm-level conductor resistance to gigaohm-level insulation resistance — all common magnitudes in electronic circuits.
Conversion is instant. All calculations run locally in your browser, so after entering a value and clicking convert, results for all 6 units appear immediately with no waiting — ideal for scenarios that require frequent conversion.
Yes, fully mobile-friendly. This tool works in browsers on computers, phones, and tablets with a responsive layout that adapts to different screen sizes, so you can convert resistance units anywhere, anytime.
It is faster, more comprehensive, and more convenient than traditional conversion tables. No manual table lookup is needed — enter a value to instantly see all 6 unit conversions at once, with results auto-formatted and one-click copy, eliminating the issues of outdated or hard-to-carry paper tables.
Results are accurate and reliable. Resistance units follow strict decimal thousand-fold relationships with no approximate conversions, so results are exact within floating-point range. Decimal parts are kept to up to 6 significant places — more than sufficient for the vast majority of applications in circuit design and component selection.
Content last updated：2026-07-17
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