Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
SI Volt Prefix Converter (µV, mV, V, kV, MV)
to = from × 10^(fromExp − toExp) on volts.
USB is 5 V. A thermocouple is millivolts. Transmission lines are kilovolts. Scope probes lie in between. Scale any SI voltage prefix to any other; this is not a voltage-drop calculator and does not know your transformer.
volts · 420 prefix pairs
millivolts
5,000 mV
Multiply by 10^3. Same dimension; only the zeros move.
- You entered
- 5 V
- Factor
- 10^3
- In scientific notation
- 5.000000e+3
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
From prefix
The “From prefix” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
USB is 5 V. A thermocouple is millivolts. Transmission lines are kilovolts. Scope probes lie in between. Scale any SI voltage prefix to any other; this is not a voltage-drop calculator and does not know your transformer. to = from × 10^(fromExp − toExp) on volts. Example: 5 V USB → 5,000 mV. A 230 kV line is 230,000 V.
to = from × 10^(fromExp − toExp) on volts.
Example: 5 V USB → 5,000 mV. A 230 kV line is 230,000 V.
When to use this SI Volt Prefix
Common use cases
- USB is 5 V. A thermocouple is millivolts. Transmission lines are kilovolts. Scope probes lie in between. Scale any SI voltage prefix to any other; this is not a voltage-drop calculator and does not know your transformer.
- Sanity-check with this case: 5 V USB → 5,000 mV. A 230 kV line is 230,000 V.
- The relationship is: to = from × 10^(fromExp − toExp) on volts.
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: From prefix
- to = from × 10^(fromExp − toExp) on volts.
- Example on the page: 5 V USB → 5,000 mV. A 230 kV line is 230,000 V.
How to Convert SI Volt Prefix Step-by-Step
- 1Enter From prefix. Use the values you have, not a catalog average, unless that is all you know.
- 2to = from × 10^(fromExp − toExp) on volts.
- 3Worked case: 5 V USB → 5,000 mV. A 230 kV line is 230,000 V.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
to = from × 10^(fromExp − toExp) on volts.
5 V USB → 5,000 mV. A 230 kV line is 230,000 V.
Example: set From prefix = 5, then read the result.
Variable definitions
- value
From prefix
The “From prefix” field. Default 5; typical range 0–1e+24.
- The conversion (to = from × 10^(fromExp − toExp) on volts.) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Prefix math does not care. Convert the number you measured; do not mix RMS and peak on the way.
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- SI Ampere Prefix ConverterLED strings in milliamps, lab picoammeters, and utility kiloamperes share one ampere. A 20 mA loop is 0.02 A. Fuses are labeled in the prefix the catalog bought, not the one your meter displays.
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- SI Farad Prefix ConverterA one-farad cap is a small brick. Everyday ceramics are picofarads and nanofarads; electrolytics are microfarads. Datasheets hop prefixes without warning. Convert before you order the wrong reel.
- SI Gram Prefix ConverterMass prefixes attach to the gram, not the kilogram. Kilogram is already kilo + gram. Scale yottagram down to yoctogram, or milligram to microgram, without mixing in pounds. Jewelry carats and troy ounces are separate legal pages.
- SI Henry Prefix ConverterPower inductors are millihenrys. RF chokes are microhenrys. A 1 H inductor is an audio-era doorstop. Scale the prefix; this is not an impedance-at-frequency calculator.
- SI Hertz Prefix ConverterAudio A4 is 440 Hz. FM radio lives in megahertz. Wi-Fi and CPUs argue in gigahertz. IR spectroscopy climbs into terahertz. Same hertz, different zeros. This grid also covers millihertz if you are watching a very slow oscillator.
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Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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