Volts to millivolts
Type a value in volts to see it in millivolts straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the volts box.
- Read the result in millivolts as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
mV = V × 1,000
Multiply the value in volts by 1,000 to get millivolts.
Example
To convert 25 V to millivolts: 25 × 1,000 = 25,000 mV.
Conversion table
| Volts (V) | Millivolts (mV) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
About the units
- Volt
- The SI unit of voltage: the potential difference that dissipates one watt when one ampere flows, so 1 V = 1 W/A.
- Millivolt
- A millivolt is exactly one thousandth of a volt, used for sensor signals, thermocouples and ECG readings.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many millivolts are in one volt?
1 V = 1,000 mV exactly.
How do I convert volts to millivolts?
Use mV = V × 1,000. For example, 25 V = 25,000 mV.
How many volts are in one millivolt?
1 mV = 0.001 V.
How many volts are in a kilovolt?
One kilovolt is exactly 1000 volts, so a 132 kV transmission line runs at 132000 volts.
Does the conversion differ for AC and DC?
No, prefix conversion is the same for both. AC ratings such as 230 V are usually RMS values, not the peak voltage.