Voltage Converter

Convert µV, mV, V, kV and MV — the SI prefixes used from sensor signals to transmission lines.

InstantResults update as you type
27 categoriesFrom length to data storage
PrivateRuns in your browser

Enter a Value

Type a number and choose the units to convert between

Fromvolts

Tomillivolts

1,000

Choose a Category

27 kinds of units — each opens its own converter

Voltage Result

The converted value updates as you type — copy, share or save it

Convert volts to4 units

Result

From

volt (V)

1,000

millivolts (mV)

1 V = 1,000 mV1 mV = 0.001 V

Decimal places

Show formula

mV = V × 1000

Results are rounded to the decimal places you choose for display only; the calculation keeps full precision.

Volts to millivolts page

Common voltage conversions

Recent conversions

Conversions you save, copy as a link or share appear here. They’re stored only in this browser.

1 V in every voltage unit

Quick convertPopular conversions with one click

How to use this tool

Type a number into From — volts are preselected. Commas and scientific notation such as 2.5e3 are accepted.
Pick the units to convert between; the result in millivolts (or whichever unit you choose) updates as you type. Use the swap button to reverse the conversion.
Set the decimal places, turn on Show formula to see the calculation, and copy or share the result.
Below the converter, the table lists every voltage unit with its exact definition, and the links open dedicated pages for the most common pairs.

Example

3.3 volts to millivolts

Value

3.3 V

Result

3,300 mV

Formula: mV = V × 1000

Common use cases

Sensor and thermocouple outputs in mV.
Battery and supply voltages.
Power distribution in kV.

Voltage unit table

Voltage units with their symbols and definitions
Unit	Symbol	System	Definition	In volts
Microvolt	µV	Metric	10⁻⁶ V	0.000001
Millivolt	mV	Metric	1/1000 V	0.001
Volt	V	SI	1 W/A, the SI unit of voltage	1
Kilovolt	kV	Metric	1,000 V	1,000
Megavolt	MV	Metric	1,000,000 V	1,000,000

Popular voltage conversions

Other unit converters

See all 27 unit converters

About voltage units

The volt is the SI unit of electric potential difference, one watt per ampere. Electronics use millivolts and microvolts for small signals, and power systems use kilovolts.

The prefixes are powers of 1,000: 1 V = 1,000 mV = 1,000,000 µV, and 1 kV = 1,000 V.

Limitations

Results are rounded for display only; the calculation keeps full precision (15 significant digits).

Frequently asked questions

How many millivolts are in a volt?

1,000.

What is a typical mains voltage?

Around 230 V in most of Europe, Asia and Africa, and 120 V in North America.

What does µV mean?

Microvolt — one millionth of a volt. Some keyboards can't type µ, so “uV” is often used instead.

Are these voltage conversions exact?

Each unit is defined from its official definition (for example 1 inch = 2.54 cm exactly). Results are calculated in double precision and only rounded to the decimal places you choose when shown.