Voltage Converter

The voltage converter switches a value between dozens of electrical units across six categories: Voltage, Current, Power, Energy, Luminous Flux, and Illuminance, each holding the units specific to that electrical quantity.

• Values accept whole numbers (120), decimals (3.14), fractions (3/4), mixed numbers (5 1/16 or 1-3/8), and scientific notation (1.5e3).
• The result is computed from the conversion ratio between the two selected units within a category, with an optional step-by-step view that shows the factor and the substituted arithmetic.
• A swap control reverses the source and target units without re-selecting either one.
• Settings holds the display precision, from 2 to 10 decimal places.

Voltage conversions run through volts as the base unit: 3,300 millivolts x (1 volt / 1,000 millivolts) = 3.3 volts, the logic-level voltage common to many microcontrollers. The same kilo- prefix applies across the other five categories: 5,000 volt-amperes of apparent power converts to exactly 5 kilovolt-amperes, and 5,000 watt-hours converts to exactly 5 kilowatt-hours, since kilo- always denotes a factor of 1,000 regardless of the electrical quantity being measured. Illuminance follows a different pattern across measurement systems rather than a metric prefix: 1 foot-candle equals about 10.76 lux, since a foot-candle measures light falling on one square foot while a lux measures the same quantity per square meter.

Electrical unit conversion is fundamental across engineering, construction, lighting design, and academic research. This converter consolidates voltage, current, power, energy, luminous flux, and illuminance units into a single interface, eliminating the need for separate conversion tools or manual formula lookups.

• Electrical Engineering: Convert between volts, millivolts, and kilovolts when designing circuits or specifying component voltage ratings. 3,300 millivolts is 3.3 volts, the logic-level voltage common to many microcontrollers.
• Power Systems: Convert between watts, kilowatts, volt-amperes, and kilovolt-amperes when sizing transformers, generators, or uninterruptible power supplies. 5,000 VA is 5 kW at unity power factor, the load figure used when sizing transformers, generators, and uninterruptible power supplies.
• Energy Auditing: Convert between watt-hours, kilowatt-hours, and megawatt-hours when analyzing electricity consumption data from utility bills or smart meters. Compare monthly usage across different reporting scales.
• Lighting Design: Convert between lumens and kilolumens when specifying fixture output for architectural lighting plans. Illuminance standards vary between lux and foot-candles across international building codes; 1 foot-candle equals about 10.76 lux.
• Electronics Prototyping: Convert between amperes, milliamperes, and microamperes when measuring sensor current draw or calculating battery life for portable devices. 850 microamperes is 0.85 milliamperes, a typical low-power sensor current draw worth converting for datasheet comparison.
• Education: Verify homework calculations in physics or electrical engineering by converting between CGS units like abvolts and statvolts and SI units like volts. The step-by-step formula view shows the conversion factor derivation, useful for confirming the arithmetic behind a CGS-to-SI conversion.
• Construction: Convert between kilovolts and volts when reading transformer nameplates, or between kilowatt-hours and megawatt-hours when estimating project energy requirements for permit applications.
• Photography: Convert illuminance between lux and foot-candles when setting up studio lighting or evaluating natural light conditions at a shooting location using light meter readings.