Voltage Converter
Convert between volts, millivolts, microvolts and kilovolts.
Formula and sources updated · Data sources · 1View algorithm, constants and default inputs (JSON)
1 V = 1,000 mV
About this calculator
Voltage is the electrical potential difference that drives current through a circuit. The SI prefix simply scales the same unit, so the conversion is a power of a thousand each step.
Worked example
calculated with the default values below
Value 1 · From Millivolts (mV) · To Volts (V) · Decimal places 4 Result 0.001 · Volts 0.001000 V · Millivolts 1.0000 mV
Method and assumptions
Formula basis and scope
Convert electric potential via volts and SI prefixes.
Only the displayed unit definitions are converted; rounding and measurement uncertainty are separate.
Data sources
Disclaimer
These calculators give general conversion results. Rounding and the precision of the value you enter both affect the output, so treat displayed decimals as indicative rather than exact.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
V = x×F[from]÷F[to]
- x
- Value
- from
- Source unit
- to
- Target unit
- F
- Factor to volts
- V
- Result
F: V 1, mV 0.001, µV 10⁻⁶, kV 1000, MV 10⁶; output also shows the value in V and mV.
Frequently asked questions
Why does converting millivolts to volts move the decimal three places?
The converter works in volts internally, applying fixed powers of a thousand: a millivolt is 0.001 V, a microvolt 1e-6, a kilovolt 1,000 and a megavolt 1,000,000. Converting 1 mV to volts therefore yields 0.001 V, exactly three decimal places, while 1 kV returns 1,000 V. The volts and millivolts outputs always show the same quantity at two scales, so a result in volts is the millivolt figure divided by a thousand.