Volts to Millivolts Converter
Convert volt to millivolt instantly. 1 V = 1000 mV, worked steps and a full reference table.
How to use it
- Type the value in volt — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 V | 1000 mV |
| 5 V | 5000 mV |
| 10 V | 10000 mV |
| 100 V | 100000 mV |
One volt equals 1000 millivolts (mV). To convert volts to millivolts, multiply by 1000; to go back the other way, multiply by 0.001 instead.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
What volts and millivolts actually measure
Volt (V) — The volt is the SI unit of potential difference — one joule per coulomb. Batteries, mains supply and virtually all electronics.
Millivolt (mV) — A millivolt is a thousandth of a volt. Thermocouples, sensor outputs and ECG traces.
Volts to Millivolts conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| V | mV |
|---|---|
| 1 V | 1000 mV |
| 2 V | 2000 mV |
| 5 V | 5000 mV |
| 10 V | 10000 mV |
| 25 V | 25000 mV |
| 50 V | 50000 mV |
| 100 V | 100000 mV |
How to convert volts to millivolts by hand
Multiply the number of volts by 1000.
For example, 25 V × 1000 = 25000 mV.
Going the other way, divide by 1000 — or multiply by 0.001, which is the same thing and easier to do in your head.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many mV are in 1 V?
1 V equals exactly 1000 mV. Multiply any value in volt by 1000 to get millivolt.
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026