How to use Voltage Converter
- Enter the voltage value from your source.
- Choose its input and output voltage scales.
- Convert and copy the result with the same measurement convention.
Example: Voltage Converter
Convert a millivolt reading.
You add
Value: 3300. From: mV. To: V.
You get
3300 mV = 3.3 V.
Options
- Potential difference and prefix
- Choose the voltage unit actually attached to the reading. The sign retains its polarity relative to the original reference points.
- Decimal places
- Keep millivolt and volt prefixes visible when rounding a potential difference. The display accepts 0, 2, 4, 6 or 8 places; extra digits are arithmetic, not a more accurate voltage reading.
Supported inputs and limits
Unit scaling only. DC, AC peak, peak-to-peak and RMS are not converted into one another. It does not measure voltage or infer electrical safety from a number. Values accept at most 64 characters, 40 significant digits, 20 fractional places and magnitude 10¹⁸. Scientific notation has at most two exponent digits. Display rounding offers 0, 2, 4, 6 or 8 decimal places; small nonzero results stay visible.
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
Scaling does not change the reference
The example converts 3300 mV to 3.3 V. This does not convert a peak reading into RMS or establish the voltage relative to a different reference. Keep those source labels with the result.
Questions about Voltage Converter
Will it change AC voltage to DC voltage?
No. It scales the stated value. AC and DC describe electrical behavior beyond the unit prefix.
What does a negative voltage mean?
It depends on the reference points used for the measurement. The converter preserves the sign.
Is mV the same as MV?
No. Milli is one thousandth; mega is one million. Prefix case matters in written SI units.