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Quickly convert voltage units like volts, millivolts, and kilovolts online with support for batch calculations.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Enter a voltage, choose its current unit, and read the equivalent values shown for the other supported units. The converter uses volts as its common base. Its list includes exavolts through picovolts, plus statvolts and abvolts; common choices include V, kV, mV, µV, nV, and pV.
Target value = input value × input-unit factor in volts ÷ target-unit factor in volts
Examples: 1 kV = 1,000 V; 1 V = 1,000 mV; 1 mV = 0.001 V.
The BIPM defines SI prefixes as decimal multiples or submultiples. The case and character of a prefix matter: k means 10³, m means 10⁻³, and M means 10⁶. Thus mV and MV represent very different scales.
The results begin at four decimal places. You can choose another display precision when a small value needs more visible digits, and trailing zeroes are removed. Rounding changes how a result is shown; it does not add precision to the original measurement.
For example, 1 nV equals 0.000000001 V. At four decimal places, a value that small may display as 0. Increase the displayed precision to see more decimal places, while keeping the instrument’s actual resolution in mind.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Type the numeric voltage as recorded, then check that you know which unit it uses.
For a value recorded in millivolts, choose mV. The page updates the equivalent values in volts and the other listed units.
Raise precision if you need to inspect a small displayed value. Lower it for a quick scale comparison.
Read the symbol beside the result before recording it. You can click a result value to use it as the new input and continue from that unit.
For instance, entering 2.5 kV corresponds to 2,500 V. Keep the unit with the number when copying or comparing values.
Use cases
See how the tool fits into real work and everyday tasks.
Convert a value such as 3.3 V to 3,300 mV before placing it beside a millivolt reading in a worksheet.
Convert 120 mV to 0.12 V when a specification sheet expresses voltage in volts.
Choose one target unit for a set of readings, then confirm that the shown decimal places preserve the detail you intend to report.
Q&A
Find concise answers to common questions and confusing cases.
1 V equals 1,000 mV. In the reverse direction, 1 mV equals 0.001 V.
The initial display rounds to four decimal places. Increase the precision to view more digits; displayed digits still do not establish measurement accuracy.
Yes. Click the displayed result you want to use. The value and unit become the new input.
SI prefix symbols are case-sensitive. For example, m is milli and M is mega, so mV and MV have different factors.
Notes
Review scope, result limitations, and important precautions before use.
This converter changes values between the listed units. It does not verify the measurement, the meter, or whether a value is suitable for a particular circuit. Before comparing measurements, confirm they use the same basis, such as peak or RMS where relevant.
More displayed decimal places do not mean the source measurement is more precise. Use the instrument resolution and the reporting requirements to decide how many digits to keep. For equipment ratings or electrical safety decisions, follow the equipment documentation and qualified measurement procedures.
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