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Voltage Conversion
Tool Description
Voltage Conversion is an online voltage unit converter supporting the International System of Units (Volt/Kilovolt/Millivolt/Microvolt/Nanovolt/Megavolt/Gigavolt), electromagnetic unit system (Abvolt), electrostatic unit system (Statvolt), and equivalent voltage units (Watt per Ampere/Joule per Coulomb). Enter any value and unit to instantly see all corresponding results, suitable for electronic circuit design, physics study, engineering calculations, and power system applications.
Usage Guide
- Enter Value
Input the value to convert, supporting integers and decimals, e.g.
220,0.001 - Select Source Unit
Choose the voltage unit from the dropdown list (V/kV/mV/μV/nV/MV/GV/statV/abV/W/A/J/C)
- View Results
Click "Convert" or press Enter to see all unit conversions, with a copy button next to each result
Use Cases
- Electronic circuit design: Quick conversion between millivolts (mV) and microvolts (μV) in circuit design. Op-amp input offset voltages are typically in the mV~μV range, while sensor output signals can be as low as nV level
- Power systems: Conversion between power plant output voltages (kV~MV) and household voltage (220V), understanding the relationship between ultra-high voltage transmission lines (500 kV, 750 kV, 1000 kV) and distribution voltages
- Physics study: Understanding the relationship between voltage and electric field strength (V/m), unit conversion practice for Ohm's law (V=IR) and power formula (P=VI) in electromagnetism
Core Advantages
- Daily Free Quota
Free usage is provided to every user every day, covering everyday lightweight conversions at zero cost. Open and use instantly without installation.
- Privacy & Security
All conversions are performed locally in your browser. Your data never leaves your device, giving you 100% privacy protection.
- Wide Unit Coverage
Covers SI, electromagnetic, electrostatic, and equivalent voltage units — 11 units in total. One input instantly returns all results.
- Accurate Results
Uses international standard conversion factors and high-precision floating-point arithmetic, with smart decimal rounding for trustworthy results.
- One-Click Copy
Every result comes with a copy button on the right. Click to copy the value for easy pasting into documents, spreadsheets, or chat tools.
SI Voltage Unit Conversion Relationships
The following table shows conversion relationships between SI voltage units, based on the Volt (V):
| Unit Name | Abbreviation | Conversion Relationship | Equivalent V |
|---|---|---|---|
| Nanovolt | nV | 1 nV = 10⁻⁹ V | 0.000000001 |
| Microvolt | μV | 1 μV = 10⁻⁶ V | 0.000001 |
| Millivolt | mV | 1 mV = 10⁻³ V | 0.001 |
| Volt | V | 1 V（基准） | 1 |
| Kilovolt | kV | 1 kV = 10³ V | 1,000 |
| Megavolt | MV | 1 MV = 10⁶ V | 1,000,000 |
| Gigavolt | GV | 1 GV = 10⁹ V | 1,000,000,000 |
Electromagnetic, Electrostatic & Equivalent Units
The following table shows the electromagnetic unit system (CGS-EMU), electrostatic unit system (CGS-ESU), and equivalent voltage unit conversion relationships:
| Unit Name | Abbreviation | Conversion Relationship | Equivalent V |
|---|---|---|---|
| Statvolt | statV | 1 statV ≈ 299.792458 V | 299.792458 |
| Abvolt | abV | 1 abV = 10⁻⁸ V | 0.00000001 |
| Watt per Ampere | W/A | 1 W/A = 1 V（由 P=UI 推导） | 1 |
| Joule per Coulomb | J/C | 1 J/C = 1 V（由 V=W/Q 推导） | 1 |
Definition and Physical Meaning of the Volt
The Volt (symbol V) is the derived SI unit for voltage (potential difference, electromotive force). 1 Volt is defined as the potential difference between two points on a conductor carrying a constant current of 1 Ampere when the power dissipated between these points is 1 Watt. That is, 1 V = 1 W/A = 1 J/C.
Voltage can be understood as a measure of the electric field's ability to do work on charges. 1 Volt means that 1 Coulomb of charge gains or loses 1 Joule of energy when passing through the electric field. Voltage is one of the most fundamental quantities in circuit analysis, following Ohm's law with current (I) and resistance (R): V = I × R.
Statvolt (statV) is the voltage unit in the centimeter-gram-second electrostatic unit system (CGS-ESU), where 1 statV ≈ 299.792458 V. Abvolt (abV) is the voltage unit in the CGS-EMU system, where 1 abV = 10⁻⁸ V, which is extremely small. These two units are rarely used in modern engineering and mainly appear in classical physics textbooks and historical literature.
FAQ
1 kV = 1,000 V, 1 mV = 0.001 V = 10⁻³ V. SI voltage units use a thousand-base system: 1 GV = 1,000 MV = 10⁶ kV = 10⁹ V; 1 V = 1,000 mV = 1,000,000 μV = 10⁹ nV. In daily life, household voltage is 220 V, a dry cell battery is 1.5 V, a smartphone lithium battery is about 3.7 V, and high-voltage transmission lines can reach 500 kV ~ 1,000 kV.
1 statV ≈ 299.792458 V. The statvolt is the voltage unit in the centimeter-gram-second electrostatic unit system (CGS-ESU). 1 statV is defined as "the potential difference between two parallel plates 1 cm apart in a vacuum when the plates carry a charge of 1 statcoulomb." Since statV is relatively large (about 300 V), it is rarely used in practical engineering and mainly appears in theoretical physics and electromagnetism textbooks.
1 abV = 10⁻⁸ V = 0.00000001 V, meaning 1 abvolt equals 10 nanovolts. The abvolt is the voltage unit in the centimeter-gram-second electromagnetic unit system (CGS-EMU). 1 abV is defined as "the voltage produced when 1 abampere of current flows through a resistance of 1 abohm." Since abV is extremely small (nanovolt level), it is rarely used in practical engineering and mainly appears in classical electromagnetism textbooks and historical literature.
Both W/A and J/C are equivalent expressions of the Volt (V), derived from different physical definitions: 1 V = 1 W/A (from the electrical power formula P = UI: U = P/I, unit is W/A); 1 V = 1 J/C (from the potential difference definition V = W/Q: the work done to move 1 Coulomb of charge with 1 Joule of energy). These three expressions are numerically equivalent and can be used flexibly depending on the context.
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. SI units use exact powers of 10 (e.g., 1 kV = 1,000 V exact value), and statvolts use the standard conversion factor (1 statV ≈ 299.792458 V). Up to 6 significant decimal places are retained, with excess digits automatically truncated. For extremely large or small values, minor errors may occur due to floating-point precision limits, but this has virtually no impact in practical applications.
It supports 11 voltage units. These include SI units — volt (V), kilovolt (kV), millivolt (mV), microvolt (μV), nanovolt (nV), megavolt (MV), gigavolt (GV); the electrostatic unit statvolt (statV); the electromagnetic unit abvolt (abV); and equivalent units watt per ampere (W/A) and joule per coulomb (J/C). Enter a value in any unit and the rest are computed automatically.
No registration or login is required. This tool provides you with free usage every day. Open the page and start using it right away, covering everyday lightweight conversions at zero cost. For higher frequency or larger workloads, you can upgrade to a membership to unlock more quota.
Yes. The page uses a responsive design and works well on mobile, tablet, and desktop browsers. On mobile, simply tap the input field, select a unit, and tap convert to see results, with the same workflow as on desktop.
They are rarely used in modern engineering. statV and abV belong to the centimeter-gram-second (CGS) unit system and have special conversion factors (1 statV ≈ 299.792458 V, 1 abV = 10⁻⁸ V). They mainly appear in classical physics textbooks and historical literature. This tool includes them to cover the complete unit system for study and special reference needs.
Click the copy icon to the right of the result field. Each unit result comes with a copy button. Clicking it automatically copies the value to your clipboard, allowing one-click pasting into documents, spreadsheets, or chat windows without selecting text manually.
Household power is 220 V, while high-voltage transmission can reach kV~MV levels. For example, household voltage in China is 220 V, dry cell batteries are 1.5 V, and smartphone lithium batteries are about 3.7 V; ultra-high-voltage transmission lines can reach 500 kV, 750 kV, and 1000 kV. This tool helps you quickly convert between these units for easy understanding and engineering calculations.
Content last updated：2026-07-16
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