Millivolts to volts
Type a value in millivolts to see it in volts 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 millivolts box.
- Read the result in volts as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
V = mV × 0.001
Multiply the value in millivolts by 0.001 to get volts.
Example
To convert 25 mV to volts: 25 × 0.001 = 0.025 V.
Conversion table
| Millivolts (mV) | Volts (V) |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1,000 | 1 |
About the units
- Millivolt
- A millivolt is exactly one thousandth of a volt, used for sensor signals, thermocouples and ECG readings.
- Volt
- The SI unit of voltage: the potential difference that dissipates one watt when one ampere flows, so 1 V = 1 W/A.
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 volts are in one millivolt?
1 mV = 0.001 V exactly.
How do I convert millivolts to volts?
Use V = mV × 0.001. For example, 25 mV = 0.025 V.
How many millivolts are in one volt?
1 V = 1,000 mV.
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.