Does my data get uploaded anywhere?
No. Everything runs locally in your browser and nothing is sent to a server.
Is this free to use?
Yes. It is completely free, with no account, no signup, and no usage limits.
Does it work on a phone?
Yes. The page runs in any modern mobile browser, on iPhone and Android alike, with no app to install.
What is the peak voltage of 230 V AC?
325.27 V, because the quoted 230 V is an RMS value and the peak of a sine wave is RMS times the square root of 2 (1.41421). The converter does not do that step, it only scales between microvolts, millivolts, volts and kilovolts.
How do I convert a millivolt ADC reading into volts?
Divide by 1,000, or enter the reading with Millivolt selected and read the Volt row. A 1,024 mV reading is 1.024 V. Enter the value once and the whole table, including microvolts, updates with it.
Where is kV used outside power lines?
X-ray tubes run at 80 to 140 kV, electron microscopes at 30 to 300 kV, and old CRT anodes at around 25 kV. Any of these is a plain multiplication by 1,000 from volts, which is what this page does.
Can this converter apply Ohm's law?
No. Ohm's law needs two of voltage, current and resistance to give you the third, and this page has only voltage units. Use the Current Converter for the amps side and do the multiplication or division yourself.
Why is the microvolt written with a Greek mu?
Micro is the SI prefix for one millionth, and its symbol is the Greek letter mu. So 1 microvolt is 0.000001 V, and the tool prints it as the mu symbol followed by V in the unit list.
How many millivolts are in a volt?
Exactly 1,000, and the same factor applies at every step: 1,000 microvolts to a millivolt, 1,000 volts to a kilovolt. A 3.3 V rail is 3,300 mV and 3,300,000 µV, so converting here never introduces rounding, it only moves the decimal point.
Can I convert volts to watts or amps here?
No, and no converter can do it from a voltage alone. Watts need volts times amps, and amps need volts divided by ohms, so you must supply the second quantity. Convert the voltage units here, then use the Current Converter or the Power Converter for the other side and do the multiplication yourself.
What is a millivolt used for?
It is the working unit for anything measured rather than supplied: ADC readings, sensor outputs, battery cell deltas, and offset voltages in op-amp datasheets. A single-cell lithium pack sitting at 3,850 mV is easier to compare against a 3,900 mV sibling than the same values written as volts.