Voltage Converter

Introduction

The Voltage Converter helps you convert electric potential difference values between volts, millivolts, microvolts, kilovolts, megavolts, and other voltage units. It is useful for electronics, batteries, sensors, power supplies, solar systems, electric vehicles, laboratory measurements, utility systems, and engineering documentation.

Voltage is one of the most familiar electrical quantities, but it is often confused with current, charge, and power. The volt is the SI derived unit for electric potential difference. Smaller and larger values are commonly written with prefixes, such as mV for millivolts and kV for kilovolts. This page explains how to use the converter and how to read voltage values with the right context.

What the Voltage Converter Does

The converter takes a voltage value in one unit and expresses it in another. For example, it can convert 5 volts to millivolts, 120 millivolts to volts, or 11 kilovolts to volts. The electrical potential difference remains the same; only the unit scale changes.

Voltage values appear across a huge range. A small sensor signal may be measured in microvolts or millivolts. A USB power supply may use volts. A battery pack may be described in volts or hundreds of volts. Electrical distribution equipment may use kilovolts. A converter helps compare these values without prefix mistakes.

How to Use the Voltage Converter

1. Enter the voltage value you want to convert.
2. Select the starting unit, such as V, mV, µV, kV, or MV.
3. Select the target voltage unit.
4. Run the conversion and review the result.
5. Keep polarity or AC/DC context separate from the unit conversion.

Be careful with prefix symbols. mV means millivolt, one thousandth of a volt. µV means microvolt, one millionth of a volt. kV means kilovolt, one thousand volts. MV means megavolt, one million volts. Confusing lowercase m with uppercase M can create a billion-fold error.

Common Voltage Units

The volt, symbol V, is the standard unit for electric potential difference. One millivolt is 0.001 volt. One microvolt is 0.000001 volt. One kilovolt is 1,000 volts. One megavolt is 1,000,000 volts. In many electronics contexts, millivolts are common for sensor outputs and signal levels. In power systems, kilovolts are common for transmission and distribution equipment.

Voltage may be written as DC, AC, RMS, peak, peak-to-peak, nominal, open-circuit, or loaded voltage. Unit conversion does not change those meanings. A 120 V RMS AC value is not the same description as 120 V peak, even though the unit is volts in both cases.

Voltage vs. Current

Voltage is electric potential difference. Current is electric charge flow measured in amperes. A circuit can have voltage present with very little current if the circuit is open. A low-voltage circuit can still carry high current if the source and wiring allow it. Voltage and current are connected by the circuit, but they are not the same measurement.

In simple resistive circuits, Ohm’s law relates voltage, current, and resistance. Voltage equals current multiplied by resistance. This converter does not solve circuit equations; it only changes voltage units. Use the right electrical formula when you need to calculate current, resistance, or power.

Voltage vs. Power and Energy

Power is measured in watts and describes the rate of energy transfer. In a simple DC circuit, power equals voltage multiplied by current. Energy is measured in joules or watt-hours and describes accumulated work or stored capacity. A battery label may include volts, ampere-hours, watt-hours, and current limits. These are related, but each tells a different part of the story.

For example, a 12 V battery and a 120 V outlet differ in voltage, but available current, protection devices, source impedance, and environment all affect hazard and performance. Unit conversion alone does not determine safety.

AC, DC, RMS, and Peak Values

Direct current, or DC, has a constant polarity under normal conditions. Alternating current, or AC, changes direction over time. AC voltage can be described using RMS, peak, or peak-to-peak values. RMS is commonly used because it relates to equivalent heating effect in resistive loads. Peak and peak-to-peak values are common in signal analysis and oscilloscope measurements.

When converting voltage units, keep the value type the same. Converting 1 V RMS to millivolts gives 1,000 mV RMS. It does not turn RMS into peak. If the value type matters, include it in the label.

Practical Use Cases

• Converting sensor output from millivolts to volts.
• Changing battery-pack voltage from volts to millivolts for documentation.
• Comparing power-system values in volts and kilovolts.
• Reading oscilloscope or multimeter results with consistent units.
• Preparing electronics notes with clear voltage labels.
• Checking data sheets that use different voltage prefixes.

For electrical work, follow applicable safety rules, equipment ratings, and qualified guidance. Voltage can be hazardous even when a conversion is mathematically simple.

Measurement and Safety Tips

Use a meter rated for the voltage category and environment. Do not measure unknown or high-voltage circuits without proper training and equipment. If a value is used for design, repair, compliance, or safety, rely on official specifications and approved test procedures, not just a converted number.

Related Tools

Use the Current Converter for amperes and milliamperes, the Power Converter for watts and kilowatts, the Charge Converter for coulombs and ampere-hours, and the Energy Converter for joules and watt-hours.

External Reference

For official measurement-system context and SI unit guidance, see NIST SI Units.

Frequently Asked Questions

What is the SI unit of voltage?

The SI derived unit for electric potential difference is the volt, symbol V.

How many millivolts are in one volt?

One volt equals 1,000 millivolts. To convert volts to millivolts, multiply by 1,000.

What is the difference between mV and MV?

mV means millivolt, one thousandth of a volt. MV means megavolt, one million volts. The uppercase letter changes the scale dramatically.

Is voltage the same as power?

No. Voltage is electric potential difference. Power is the rate of energy transfer and is measured in watts.

Can this converter tell me whether a voltage is safe?

No. Safety depends on voltage, current capacity, source type, environment, protection, exposure path, and standards. Use proper electrical safety procedures.