Voltage is the electrical pressure that pushes current through a circuit, and American daily life runs on a handful of familiar values: 1.5 volts in a AA battery, 12 volts in a car battery, 120 volts at the wall outlet, thousands of volts in power lines. The volt is the SI unit, and the conversions are pure decimal prefixes — no messy factors. Type 12 into the Volts (V) box and the Millivolts (mV) readout shows 12,000, the Kilovolts (kV) box shows 0.012, and the Megavolts (MV) box shows 0.000012. The formulas are multiply by 1,000 for millivolts, divide by 1,000 for kilovolts, divide by 1,000,000 for megavolts. Electronics hobbyists live in millivolts when reading sensor outputs, electricians think in volts and kilovolts when sizing panels, and utility engineers talk megavolts for transmission lines. Mixing up mV and V is the classic blown-fuse mistake — a sensor output of 500 mV is half a volt, not five hundred — so let this page keep the decimal point honest.

With the pre-filled defaults — Volts (V) 220 — the Electric Potential Converter returns Millivolts (mV) 220,000.00, Kilovolts (kV) 0.220000, Megavolts (MV) 0.00022000. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.