Voltage Converter

Convert between Volt, Millivolt, Microvolt and more

Free online voltage unit converter supporting 4 units: Volt (V), Millivolt (mV), Microvolt (µV), Kilovolt (kV). Real-time conversion with high precision. No registration required.

How to Use

Simple 3-step process to convert voltage units:

Step 1: Enter Value
Enter the voltage value in any unit field (Volt, Millivolt, Microvolt, or Kilovolt)
Step 2: Automatic Conversion
All other unit fields will be automatically converted in real-time
Step 3: Copy Results
Copy the converted values you need for your calculations

All conversions are performed in your browser. No data is sent to our servers.

Voltage Converter Tool

Volt (V)

Millivolt (mV)

Microvolt (µV)

Kilovolt (kV)

Practical Use Cases

Voltage converters are essential in various fields:

1. Battery Systems

Convert battery voltages for different applications. AA battery: 1.5 V = 1500 mV. Car battery: 12 V = 12,000 mV. Understanding voltage conversions is crucial for battery selection and circuit design.

2. Electronics and Microcontrollers

Microcontroller I/O pins typically operate at 3.3 V or 5 V. Sensor signals may be in millivolts (0-100 mV). Convert between units to ensure proper voltage levels for component compatibility.

3. Power Distribution

Household power: 120 V (USA) or 230 V (Europe). High voltage transmission lines: 110 kV to 765 kV. Converting between V and kV helps understand power grid infrastructure and electrical safety.

4. Signal Processing

Audio signals are typically measured in millivolts (mV). Microphone output: 1-10 mV. Line level: 316 mV. Converting between µV, mV, and V is essential for audio engineering and signal analysis.

5. Medical Devices

ECG signals are measured in microvolts (µV) and millivolts (mV). Typical ECG: 1-5 mV = 1000-5000 µV. Converting between these units is critical for medical diagnostics and biosignal processing.

What is Voltage Conversion?

Voltage is the electric potential difference between two points. Different applications use different units to measure voltage, making conversion essential.

Common Voltage Units

Volt (V) is the SI unit of electric potential. 1 Volt = 1 Joule per Coulomb of charge. Millivolt (mV) is one-thousandth of a volt (1 mV = 0.001 V), commonly used for small signals. Microvolt (µV) is one-millionth of a volt (1 µV = 0.000001 V), used for very small signals like biosignals. Kilovolt (kV) is one thousand volts (1 kV = 1000 V), used in high-voltage systems like power transmission.

Why Convert Voltage Units?

Different industries and applications use different voltage units. Electronics typically use volts and millivolts for circuits and sensors. Medical devices measure biosignals in microvolts. Power engineering uses kilovolts for transmission lines. Converting between these units ensures accurate measurements, proper component selection, and safety compliance.

Conversion Accuracy

This converter uses exact conversion factors: 1 V = 1000 mV = 1,000,000 µV = 0.001 kV. All conversions are mathematically exact with no approximations. Results are provided with up to 10 decimal places for scientific and engineering precision.

Frequently Asked Questions

What is the difference between Volt and Millivolt?

Volt (V) is the SI unit of electric potential. Millivolt (mV) is one-thousandth of a volt: 1 V = 1000 mV. Small electronic signals are often measured in millivolts (e.g., sensor output: 50 mV), while larger systems use volts (e.g., USB power: 5 V, car battery: 12 V).

How do I convert mV to V?

Divide millivolts by 1000 to get volts. For example: 3300 mV = 3300 ÷ 1000 = 3.3 V. Conversely, multiply volts by 1000 to get millivolts: 5 V = 5 × 1000 = 5000 mV.

What voltage is dangerous to humans?

Voltages above 50 V AC or 120 V DC are generally considered dangerous and can cause electric shock. However, danger also depends on current. High voltage power lines (>10 kV) are extremely dangerous and should only be handled by trained professionals.

Why do sensors output millivolts?

Many sensors produce small signals (1-100 mV) because they detect subtle physical changes (temperature, pressure, light). Using millivolts avoids small decimal values: 50 mV is clearer than 0.050 V. Signal amplification is then used to boost mV signals to usable voltage levels.

What is a microvolt used for?

Microvolts (µV) measure extremely small voltages in sensitive applications: EEG brain signals (10-100 µV), thermocouple outputs (40 µV/°C), low-noise amplifier specifications (< 1 µV noise). 1 µV = 0.001 mV = 0.000001 V. Medical and scientific instruments often operate at microvolt levels.

How accurate is this voltage converter?

This converter uses exact mathematical conversions with up to 10 decimal places precision. Conversion factors are exact: 1 V = 1000 mV (exact), 1 mV = 1000 µV (exact), 1 kV = 1000 V (exact). No approximations are used.

What is Kilovolt used for?

Kilovolt (kV) is used for high-voltage applications: power transmission lines (110-765 kV), X-ray machines (30-150 kV), lightning (100-1000 kV peak), industrial equipment (10-50 kV). 1 kV = 1000 V. High voltage requires special safety precautions and equipment.

How do I measure voltage safely?

Use a multimeter or voltmeter appropriate for the voltage range. Always start with the highest voltage range and work down. For voltages above 50 V, use insulated probes and follow electrical safety procedures. Never measure high voltage (>1 kV) without proper training and safety equipment. Always de-energize circuits before measuring when possible.