Free Toolkit

Voltage ConverterConvert between volts, millivolts, microvolts, kilovolts, and megavolts.

Voltage Converter illustration
⚖️

Voltage Converter

Convert between volts, millivolts, microvolts, kilovolts, and megavolts.

How to Use
1

Enter voltage

Type the voltage value.

2

Select units

Choose source and target voltage units.

3

Get the result

Converted voltage appears instantly.

What Is Voltage Converter?

A voltage converter translates between different scales of the volt, the SI derived unit of electric potential difference. One volt is the potential difference that drives one ampere of current through one ohm of resistance (V = IR). Millivolts (mV) and microvolts (µV) are used for sensor signals and biomedical measurements (ECG, EEG). Kilovolts (kV) are used for power transmission and high-voltage equipment. Megavolts (MV) appear in particle accelerators and lightning research. This converter covers the full practical range of voltage measurements.

Why Use Our Voltage Converter?

  • Covers µV to MV — the full practical voltage range.
  • Essential for electronics and electrical engineering.
  • Real-time bidirectional conversion.
  • Quick reference for common voltage levels.

Common Use Cases

Electronics

Convert between mV and V for sensor signals and analog circuits.

Power Systems

Convert between V and kV for power transmission specifications.

Biomedical

Convert between µV and mV for ECG, EEG, and other biosignal measurements.

High-Voltage Engineering

Work with kV and MV specifications for transformers and accelerators.

Technical Guide

The volt (V) is defined as the potential difference across a conductor when 1 ampere dissipates 1 watt of power: V = W/A = kg·m²/(A·s³). • 1 MV = 1,000 kV = 1,000,000 V • 1 kV = 1,000 V • 1 V = 1,000 mV = 1,000,000 µV Common voltages: • EEG brain signal: 10-100 µV • AA battery: 1.5 V • USB: 5 V • US household: 120 V (RMS) • EU household: 230 V (RMS) • Power lines: 110-765 kV • Lightning: 100-300 MV

Tips & Best Practices

  • 1
    US household: 120V. European household: 230V.
  • 2
    Sensor signals are often in mV or µV — precision amplification is needed.
  • 3
    Power line voltages are in kV to reduce transmission losses (P = I²R).
  • 4
    Lightning can reach 100-300 million volts (100-300 MV).

Related Tools

Electric Current Converter

Convert between amperes, milliamperes, microamperes, and kiloamperes.

Unit Converters

Power Converter

Convert between watts, kilowatts, megawatts, horsepower, PS, BTU/h, and ft-lbf/s.

Unit Converters

Capacitance Converter

Convert between farads, millifarads, microfarads, nanofarads, and picofarads.

Unit Converters

Inductance Converter

Convert between henries, millihenries, microhenries, and nanohenries.

Unit Converters

Length Converter

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles instantly.

Unit Converters

Weight Converter

Convert between milligrams, grams, kilograms, ounces, pounds, metric tons, and stones in real time.

Unit Converters

Frequently Asked Questions

QHow many millivolts in a volt?
Exactly 1,000 millivolts (mV) equal one volt (V).
QWhy is power transmitted at high voltage?
Higher voltage allows the same power to be transmitted with lower current (P = VI), which reduces resistive losses (P_loss = I²R). This is why power lines use 100+ kV.
QWhat voltage is a car battery?
A car battery is nominally 12V (12.6V fully charged). The charging system operates at about 14V.
QWhat is the difference between AC and DC voltage?
DC voltage is constant. AC voltage alternates direction — household 120V/230V is the RMS (root mean square) value; the peak is about 1.414× higher.

About Voltage Converter

Voltage Converter is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.