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Electric Field Strength Converter
Tool Description
Electric Field Strength Converter is an online electric field strength unit converter that supports mutual conversion between volt per meter (V/m), kilovolt per meter (kV/m), millivolt per meter (mV/m), microvolt per meter (μV/m), volt per centimeter (V/cm), newton per coulomb (N/C), and decibel microvolt per meter (dBμV/m). Enter any value and unit to instantly view the corresponding results in all other units. Suitable for EMC testing, wireless communication engineering, power system design, physics education and research, and more.
How to Use
- Enter a value
Type the electric field strength value you want to convert, supporting integers and decimals, e.g.,
100,0.05 - Select source unit
Choose the electric field strength unit of your value from the dropdown (V/m/kV/m/mV/m/μV/m/V/cm/N/C/dBμV/m)
- View results
Click the "Convert" button or press Enter, and the result area below will display the corresponding values in all units. Each result has a copy button for convenience.
Use Cases
- EMC testing: In electronic product EMC certification testing, radiated emission limits are often expressed in dBμV/m, while standards documents may use V/m. Use this tool to quickly convert between different units for easier interpretation of test results
- Wireless communication engineering: Electric field strength measurements at communication base stations are often in V/m or dBμV/m, with different standards in different countries and regions. Use this tool to unify conversions for international standard comparison
- Physics education and research: In electromagnetism education, electric field strength is a core concept, commonly expressed in both V/m and N/C. Use this tool to visually verify their equivalence (1 N/C = 1 V/m) and deepen understanding
Key Advantages
- Completely Free
All features are free to use with no registration or payment required. Simply open the page and start using it immediately, with no feature restrictions or usage limits.
- Privacy Safe
All conversions run entirely in your browser locally. Your input data is never uploaded to any server, fully protecting your privacy and data security.
- Comprehensive Units
Supports seven electric field strength units including volt per meter, kilovolt per meter, newton per coulomb, and decibel microvolt per meter, covering both linear and logarithmic units for EMC, communication, and educational needs.
- Instant Conversion
Enter a value and select a unit to get results for all units instantly. No waiting, fast response, what you see is what you get.
- Easy to Use
The interface is clean and intuitive, requiring no expertise. Beginners can easily get started, and every result offers one-click copy.
Electric Field Strength Unit Conversion Relationships
The following shows the conversion relationships between electric field strength units, with volt per meter (V/m) as the base unit:
| Unit Name | Abbreviation | Conversion Relationship | Equivalent V/m |
|---|---|---|---|
| Volt per Meter | V/m | 1 V/m（基准单位） | 1 |
| Kilovolt per Meter | kV/m | 1 kV/m = 1,000 V/m | 1,000 |
| Millivolt per Meter | mV/m | 1 mV/m = 0.001 V/m | 0.001 |
| Microvolt per Meter | μV/m | 1 μV/m = 10-6 V/m | 0.000001 |
| Volt per Centimeter | V/cm | 1 V/cm = 100 V/m | 100 |
| Newton per Coulomb | N/C | 1 N/C = 1 V/m（等价定义） | 1 |
| Decibel Microvolt per Meter | dBμV/m | dBμV/m = 20·log10(E/1μV/m) | — |
Common Electric Field Strength Reference Values
The following shows typical electric field strength values for different scenarios in daily life, for reference and comparison:
| Scenario | Electric Field Strength |
|---|---|
| Home environment (30cm from appliances) | ~100 V/m |
| Under high-voltage transmission lines (500kV) | ~5,000 V/m |
| Near mobile phone base stations (50m) | ~100 V/m |
| Air breakdown field strength (dry air) | ~3×106 V/m |
| Electron orbit near hydrogen nucleus | ~1011 V/m |
| Electric field during lightning | 106 ~ 107 V/m |
Relationship Between Electric Field Strength and Potential Difference
Electric Field Strength and Potential Difference (Voltage) are closely related concepts in electromagnetism. Electric field strength measures the force experienced by a unit positive charge in an electric field, with units of volt per meter (V/m) or newton per coulomb (N/C), which are equivalent (1 N/C = 1 V/m). Potential difference measures the potential difference between two points in an electric field, with the unit of volt (V).
In a uniform electric field, the relationship is: Electric field strength E = Potential difference U / Distance d, i.e., V/m = V / m. For example, with two parallel metal plates spaced 1 cm apart and a 100 V voltage applied, the uniform electric field strength between the plates is 100 V / 0.01 m = 10,000 V/m = 10 kV/m = 100 V/cm. dBμV/m is a logarithmic unit commonly used in EMC: dBμV/m = 20 * log10(E / 1 μV/m), meaning 0 dBμV/m = 1 μV/m.
FAQ
Electric field strength (symbol E) is a physical quantity that describes the strength and direction of an electric field, defined as the force experienced by a unit positive charge at a point in the field. V/m (volt per meter) is the standard SI unit of electric field strength, indicating a potential difference of 1 volt per meter in the direction of the electric field. Another equivalent expression is N/C (newton per coulomb), indicating a force of 1 newton on a unit positive charge. The two are numerically identical: 1 V/m = 1 N/C.
dBμV/m (decibel microvolt per meter) is a logarithmic unit of electric field strength widely used in EMC and wireless communication. The conversion formula to V/m is: E(dBμV/m) = 20 * log10(E / 1 μV/m). For example, 100 μV/m = 20 * log10(100) = 40 dBμV/m. Conversely, E(μV/m) = 10^(E(dBμV/m)/20). The advantage of using dB units is the ability to represent a wide range of values with smaller numbers, making comparison and calculation easier.
1 V/m = 1 N/C, they are numerically equivalent. V/m (volt per meter) is defined from the potential difference perspective and is more commonly used in electrical engineering and practical measurements (e.g., field strength meters output V/m). N/C (newton per coulomb) is defined from the force perspective and is more commonly used in physics education and theoretical analysis, intuitively reflecting the physical nature of "electric field exerting force on charges". In practice, the vast majority of scenarios use V/m.
Electric field strengths in daily life vary widely: near household appliances, typically tens to hundreds of V/m; under high-voltage transmission lines, up to thousands of V/m; near mobile phone base stations, about a few V/m. The International Commission on Non-Ionizing Radiation Protection (ICNIRP) recommends public exposure reference levels of 5 kV/m for 50 Hz power frequency electric fields, and approximately 28-61 V/m for radio frequencies (e.g., mobile phone base station bands, varying with frequency). Standards may differ by country; please refer to local regulations.
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. Conversions between linear units (V/m, kV/m, mV/m, μV/m, V/cm, N/C) are exact proportional relationships with no approximation. dBμV/m is a logarithmic unit; conversion uses the Math.log10() function. Due to floating-point precision limitations, there may be rounding errors in the last significant digit, but it fully meets engineering application accuracy requirements. Up to 6 significant decimal places are retained.
Seven common units are supported: volt per meter (V/m), kilovolt per meter (kV/m), millivolt per meter (mV/m), microvolt per meter (μV/m), volt per centimeter (V/cm), newton per coulomb (N/C), and decibel microvolt per meter (dBμV/m). Both linear and logarithmic units are covered, suitable for EMC, wireless communication, and physics education scenarios.
No login and no limits. This tool is completely free to use. Just open the page to start; no account registration is needed, and there is no daily conversion limit, making it ideal for on-the-go unit conversions anytime.
1 kV/m = 1,000 V/m, and 1 V/cm = 100 V/m. Therefore 1 V/cm = 0.1 kV/m. This tool gives corresponding values for all units with one click, saving you from manual scale calculations.
Yes. This tool uses a responsive layout that perfectly adapts to phone, tablet, and desktop browsers. No app installation is required, and it runs smoothly in any mobile browser such as WeChat, Safari, or Chrome.
dBμV/m is a logarithmic unit that expresses an extremely wide field-strength range from microvolts to hundreds of volts with small numbers, making comparison and calculation easier within the wide dynamic range of drawings and limits. It also aligns with the logarithmic nature of engineering quantities like audible loudness and filter attenuation. This tool converts between V/m and dBμV/m with one click.
Oscilloscopes and field strength meters are used to measure real on-site electric field strength, while this tool is used to convert theoretical values between different units. They complement each other: first measure the value with the instrument, then use this tool to convert across units and compare against standard limits, enabling more efficient EMC interpretation and engineering analysis.
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